D2: Country-Level Feasibility Assessments

Executive Summary

This report presents country-level feasibility assessments of carbon finance as a mechanism to support the operations and maintenance (O&M) of rural water services in four priority SIRWASH countries: Bolivia, Brazil, Haiti, and Peru. Assessments were conducted across four dimensions—technical, institutional, operational, and financial—drawing on desk review of national water sector data, carbon market registries, and stakeholder consultations.

The core technical premise is that certified safe water supply interventions can generate carbon credits by reducing or eliminating household dependence on non-renewable biomass combustion for water boiling—a practice that remains widespread across rural LAC. Credits are generated under methodologies such as the Gold Standard TPDDTEC, GS Safe Water, and Verra/VCS ACM0002, each with distinct requirements around additionality, baseline establishment, and monitoring, reporting, and verification (MRV).

Across all four countries, a structural gap persists between O&M funding requirements and available revenues. Published estimates suggest per-capita O&M shortfalls in the range of $7–$43/capita/year in comparable rural water systems; carbon revenue at achievable credit yields ($3–$8 per tCO₂e, 0.2–0.8 tCO₂e/household/year) can realistically close 15–60% of this gap under favorable conditions, but is unlikely to fully substitute for public subsidies or tariff reform.

Part 1: Cross-Cutting Analytical Framework

Before examining individual countries, this section establishes the cross-cutting analytical framework applied consistently across all four assessments. It addresses: (A) applicable carbon methodologies and their suitability for different country contexts; (B) the institutional and regulatory landscape governing voluntary carbon market participation in LAC; and (C) MRV readiness as a foundational enabling condition for carbon project development.

1.1 Carbon Methodology Applicability Across LAC Contexts

Overview of Applicable Methodologies

Three methodological frameworks under the voluntary carbon market (VCM) are directly applicable to safe drinking water interventions in rural LAC contexts. Each imposes distinct requirements on project design, baseline construction, additionality demonstration, and MRV systems. The choice of methodology has significant implications for credit yield, certification cost, and long-term project viability.

Gold Standard TPDDTEC (Technology and Practice for Displacement of Decentralized Thermal Energy Consumption). The Gold Standard TPDDTEC methodology is the most widely used framework for drinking water interventions globally and the default approach for projects generating carbon credits from household water treatment. It covers scenarios where centralized safe water supply displaces household boiling using non-renewable biomass (primarily fuelwood, crop residue, or charcoal). Credits are calculated based on the quantity of non-renewable biomass displaced, using country- or region-specific non-renewable biomass fractions (f_NRB) and emission factors for combustion. The methodology requires rigorous baseline surveys to establish boiling prevalence and fuel use, ongoing usage monitoring, and periodic recertification. Crediting periods are five years (renewable twice, for a maximum of fifteen years), and baselines must be revised at each renewal. Projects must demonstrate additionality through financial analysis or barrier analysis, with conservative assumptions required for each parameter. TPDDTEC is particularly well-suited to piped water system contexts where large household populations shift from boiling to treated tap water, as the intervention is infrastructural and behavior change is relatively durable.

Gold Standard Safe Water (GS Safe Water / Methodology for Water Purification Devices). The GS Safe Water methodology targets household-level water treatment technologies—point-of-use filters, solar disinfection, chemical treatment—rather than centralized infrastructure. It is more commonly applied to WASH NGO-type projects distributing devices to households. Emission reductions are similarly calculated from reduced biomass combustion, but usage monitoring requirements focus on tracking device adoption and continued use over time. Crediting periods and renewal structures are analogous to TPDDTEC. GS Safe Water is more appropriate where centralized piped water is not the primary intervention (e.g., Haiti’s dispersed rural population), but introduces higher monitoring burden per household due to the need to verify ongoing device use. In LAC, GS Safe Water projects have been less common than TPDDTEC; the methodology may be more suitable for pilot-scale programs in contexts with limited infrastructure.

Verra VCS / ACM0002 (Consolidated Baseline Methodology for Grid-Connected Electricity Generation from Renewable Sources). While ACM0002 is primarily a grid electricity methodology, Verra has approved household energy methodologies under the VCS framework, including AMS-III.AV (Low greenhouse gas emitting water purification systems) and AMS-I.C (Thermal energy production with or without electricity). For rural water in LAC, the most relevant Verra pathway is through the SD VISta (Sustainable Development Verified Impact Standard) overlay applied to water sector projects, or through standalone VCS methodology application. Verra methodologies generally have more flexible MRV options and can accommodate aggregation across dispersed project developers. The Verra REDD+ framework has deeper presence in LAC (particularly Brazil, Peru, Bolivia), which may create institutional familiarity that benefits WASH-adjacent projects, but carbon-for-water projects remain uncommon in the Verra pipeline for this region.

Additionality Requirements

All three frameworks require demonstration that emissions reductions would not occur in the absence of carbon finance (additionality). In practice, this means project developers must establish that: (i) existing rural water service providers lack sufficient revenue to sustain operations without supplemental carbon income; (ii) no regulatory or policy mandate requires the specific emission reduction activity; and (iii) the carbon finance mechanism is financially decisive for project implementation or continuation.

In the LAC context, rural water service providers are nearly universally financially distressed—underfinancing is structural and well-documented. This creates a generally favorable additionality environment, but project developers must nonetheless document the financial gap rigorously. IDB’s own program documentation of the O&M financing gap can serve as contextual evidence of additionality across all four countries, provided it is linked to site-specific financial projections.

A particular challenge arises where government programs or conditional transfers provide baseline infrastructure investment: validators may question whether the carbon intervention is truly additional if government would have funded service expansion regardless. Project design must carefully delineate the boundary between government-funded infrastructure (which establishes the baseline scenario) and carbon-financed O&M operations (which represent the project scenario).

Crediting Periods and Baseline Revision

Standard crediting periods of five years (renewable) create a significant mismatch with rural water infrastructure investment horizons of 15–25 years. This temporal mismatch has practical implications: (i) the first crediting period bears all project development costs (PDD preparation, validation, registration—typically $30,000–$80,000), making revenue in years one through five critical for cost recovery; (ii) baseline revision at renewal introduces uncertainty about credit yield, which complicates long-term O&M revenue planning; (iii) service providers must invest in MRV systems that outlast any single crediting period.

Baseline revision every five years is particularly consequential in rapidly urbanizing countries (Brazil, Peru) where rural populations and boiling practices may shift substantially. Baseline revision can reduce credits significantly if access to improved water increases in the broader baseline population. Conservative project design should account for this risk in financial modeling.

1.2 Institutional and Regulatory Landscape

Carbon Market Legal Frameworks in LAC

The institutional landscape governing voluntary carbon market participation in LAC has shifted significantly since the adoption of the Paris Agreement and the subsequent development of Article 6 mechanisms. Countries vary considerably in whether they have established domestic carbon registries, Article 6 bilateral agreements, or explicit restrictions on the export of carbon credits for activities that count toward their Nationally Determined Contributions (NDCs).

At the regional level, LAC countries collectively account for a substantial share of global voluntary carbon market supply, primarily through REDD+ forest projects in the Amazon basin. However, household energy and water sector projects remain a small fraction of this pipeline, and the institutional infrastructure for certifying and transacting such credits is concentrated in a handful of organizations with limited presence in rural water governance.

A critical emerging constraint is the interaction between voluntary carbon markets and Article 6.2 bilateral agreements under the Paris Agreement. Countries that have agreed to transfer Internationally Transferred Mitigation Outcomes (ITMOs) to purchasing countries must apply Corresponding Adjustments (CAs) to their own NDC accounting—meaning that a carbon credit sold internationally cannot also count toward the host country’s own emissions reduction commitments. For countries with ambitious NDCs (Bolivia, Peru), this creates political sensitivity around VCM participation that project developers must navigate carefully.

Article 6 Positions by Country

Bolivia has taken a notably restrictive position on Article 6, having pushed for exclusion of carbon markets from international climate frameworks and maintaining formal opposition to market-based mechanisms within the UNFCCC. Domestically, Bolivia’s “Rights of Mother Earth” legal framework (Law 71/2010) and its NDC language express preference for non-market approaches. In practice, this means that while voluntary carbon projects technically operate independently of Article 6, Bolivian government stakeholders may view VCM projects skeptically, and obtaining Letters of Authorization (LoAs) for internationally sold credits may be politically complex.

Brazil has emerged as one of the most active and commercially sophisticated carbon markets in LAC, with a domestic Voluntary Carbon Market Decree (2023) establishing a national carbon registry framework (SINARE) and advancing toward a regulated cap-and-trade system. Brazil’s Article 6 engagement is active and commercially motivated. This creates institutional infrastructure that can benefit rural water carbon projects, but also introduces a competitive, commercialized market environment in which small rural water projects may struggle to access registries and buyers without aggregation.

Haiti has minimal engagement with carbon markets and no domestic regulatory framework. As a Least Developed Country (LDC), Haiti benefits from certain preferential provisions under Gold Standard rules (reduced documentation requirements in some cases), and its NDC commitments under the Paris Agreement are explicitly contingent on international financial support. Haiti’s Article 6 position is accommodating in principle, but the absence of functional regulatory institutions makes any formal authorization process uncertain.

Peru has an active voluntary carbon market presence, primarily through REDD+ projects in the Amazon, and has developed a national carbon registry (Registro Nacional de Carbono). Peru’s Article 6 negotiations have been commercially oriented, and the country has issued Letters of Authorization for VCM projects in forestry. Extending this framework to water sector projects is theoretically straightforward but has not yet been tested.

Existing Carbon Project Activity in Water/WASH

A review of the Gold Standard, Verra, and CDM registries identifies limited precedent for carbon projects linked to rural water services specifically in the four priority countries. Global precedent exists primarily in Sub-Saharan Africa (particularly Kenya, Rwanda, Ethiopia) and South/Southeast Asia, driven by MWA-affiliated organizations and their implementing partners. In LAC, the only documented examples of water-linked carbon projects are scattered point-of-use filter distribution programs in Central America (Honduras, Guatemala) and one small-scale project in Haiti (status uncertain).

The absence of precedent in the priority countries is both a constraint and an opportunity: there are no established local project developers or certification bodies with water sector VCM experience, but there is also no market saturation and significant first-mover advantage for organizations that establish functioning projects.

1.3 MRV Readiness and Digital Infrastructure

MRV Requirements for Water Carbon Projects

Monitoring, Reporting, and Verification (MRV) is both the technical backbone and the primary cost driver of water carbon projects. Under TPDDTEC and GS Safe Water, minimum MRV requirements include: (i) baseline surveys documenting water treatment practices and fuel use for a representative household sample; (ii) ongoing usage monitoring at six-month or annual intervals, typically through household surveys or proxy monitoring indicators; (iii) periodic independent audits (at minimum at renewal); and (iv) water quality testing to confirm that the intervention is delivering the claimed access to safe water.

Traditional MRV approaches—paper-based household surveys conducted by field staff—are costly, prone to recall bias, and difficult to scale. In the LAC context, where project populations are dispersed across difficult terrain and service providers have limited administrative capacity, traditional MRV represents a prohibitive cost barrier for small-scale projects.

Digital MRV Technologies

The emergence of digital MRV approaches offers a pathway to substantially reduce MRV costs while improving data quality. A growing literature documents the application of sensor-based monitoring, mobile data collection platforms, and remote sensing to WASH program monitoring.

For rural water carbon projects specifically, relevant digital MRV technologies include: (i) flow sensors on piped water distribution networks that provide continuous, tamper-evident data on water delivery to households; (ii) water quality sensors (turbidity, chlorine residual, conductivity) that confirm delivery of treated water; (iii) satellite-based nighttime light and vegetation indices that can serve as proxy indicators of biomass use change; and (iv) mobile survey platforms (KoBoToolbox, ODK) that enable rapid, low-cost household usage surveys with GPS verification and image capture.

The Virridy platform, developed by a consortium team member, offers an integrated sensor deployment and data management infrastructure specifically designed for rural water systems in developing country contexts. Virridy sensor nodes can capture flow, pressure, water quality, and operational status data continuously, transmitting via cellular or LoRaWAN networks to a cloud dashboard. This infrastructure is directly applicable to the MRV requirements of TPDDTEC and could substantially reduce the ongoing monitoring costs that have historically constrained water carbon project viability.

Critically, Gold Standard has shown openness to alternative MRV approaches that provide equivalent or superior data quality to traditional surveys—including sensor-based proxy monitoring—provided that the methodology for converting sensor data to emission reduction estimates is validated. This creates an opportunity to pioneer a digital MRV approach within this project that could become a global template for water carbon projects.

Cross-Country MRV Landscape

MRV readiness varies substantially across the four countries. Peru and Brazil have the most developed digital infrastructure, including cellular connectivity in most departmental capitals and expanding coverage in rural areas. Bolivia and Haiti face more significant connectivity constraints, particularly in remote highland (Bolivia) and rural plateau (Haiti) areas. Across all four countries, existing rural water service providers operate with minimal digital infrastructure, meaning that sensor deployment would represent a genuine step-change in operational monitoring rather than an incremental improvement.

The consortium’s approach envisions embedding digital MRV infrastructure within operational monitoring systems—so that sensors serving carbon MRV purposes simultaneously provide service quality data to operators—reducing the marginal cost of MRV and aligning incentives between O&M improvement and carbon credit generation.

Part 2: Individual Country Assessments

The following country notes assess each of the four priority SIRWASH countries across a common framework: (A) Country context, (B) Feasibility assessment across technical, institutional, operational, and financial dimensions, (C) Country-specific opportunities and constraints, and (D) Viability classification with justification. Each note is designed to be extractable as a standalone country brief for stakeholder engagement.

Bolivia

A. Country Context

Rural Water Sector Overview

Bolivia is one of the least urbanized countries in South America, with approximately 31% of its population residing in rural areas as of 2023 (World Bank). Rural population is concentrated in two distinct geographic zones: the Altiplano (high-altitude plateau, 3,500–4,100 m above sea level), where predominantly indigenous Aymara and Quechua communities depend on community-managed water systems; and the lowland tropical regions (Beni, Santa Cruz, Pando), characterized by dispersed settlements with limited formal water service delivery.

According to JMP 2023 estimates, approximately 72% of Bolivia’s rural population has access to at least basic water services, but safely managed water coverage—the relevant benchmark for carbon methodology baseline purposes—is substantially lower, estimated at 23–35% in rural areas. Bolivia’s rural water sector is governed through the Ministry of Environment and Water (Ministerio de Medio Ambiente y Agua, MMAyA) and its subordinate entity EMAGUA, which finances and supervises rural water infrastructure investment. Service delivery is predominantly organized through community-based water operators (Operadores Comunitarios de Servicios de Agua, OCABs), which manage systems with minimal technical support and limited O&M revenue.

The OCAB model is structurally underfunded: tariffs are typically set by community assembly at levels well below O&M cost recovery, averaging $1–$3/month per household in studied systems versus estimated O&M costs of $5–$10/month. The resulting funding gap leads to deferred maintenance, operational failures, and reversion to unimproved water sources—which in turn sustains household boiling practices that underpin the carbon project premise.

Household Water Treatment Practices and Fuel Sources

Boiling is the predominant household water treatment practice in rural Bolivia, particularly in the Altiplano, where cultural practice, low temperatures, and limited access to alternative treatment options sustain its use. Survey data suggests boiling prevalence in rural Altiplano communities ranges from 55% to 80% of households that still rely on unimproved or partially improved water sources. In lowland areas, boiling prevalence is somewhat lower due to warmer temperatures (reducing cultural reliance on fire for heating and cooking coinciding with water boiling) and greater access to point-of-use treatment products.

The primary fuel source for boiling in the Altiplano is non-renewable biomass—primarily dried dung (bosta) and brushwood collected from degraded high-altitude ecosystems. This is a critically important characteristic for carbon methodology purposes: TPDDTEC requires that displaced fuel be non-renewable biomass, and the scarcity and ecological sensitivity of Altiplano biomass sources strengthens the case for non-renewability. In lowland areas, LPG use is more prevalent as cooking fuel, which would substantially reduce carbon credit yield for boiling displacement in those areas.

At altitude, the boiling point of water is reduced (approximately 90°C at 3,500m), which may mean that less fuel is required per boiling event than at sea level—a nuance that should be reflected in emission factor calculations.

Climate and Biophysical Conditions

Bolivia’s Altiplano zone presents a challenging biophysical context for rural water services. Average annual rainfall at La Paz (~600mm/year) is relatively low, and seasonal variation is pronounced—a wet season (November–March) delivers most annual precipitation while a prolonged dry season imposes stress on surface water sources and groundwater recharge. Climate change projections for the Altiplano indicate increasing variability, more intense rainfall events, and accelerated glacier retreat, all of which threaten water availability and quality for rural communities. This climate vulnerability strengthens the development case for improved water infrastructure but also introduces hydrological risk to project baselines (water source reliability) that should be addressed in PDD design.

B. Feasibility Assessment

Technical Feasibility

Bolivia’s technical feasibility for carbon finance linked to rural water is driven by the combination of high boiling prevalence, widespread non-renewable biomass fuel use, and a large rural population with unmet access to safely managed water. Indicative emission reduction calculations for a hypothetical project serving 10,000 rural Altiplano households are presented below.

Illustrative emission reduction estimate (Altiplano project):

• Household population: 10,000 HH × 5.0 persons/HH = 50,000 persons
• Estimated boiling prevalence (pre-intervention): ~65% of households
• Non-renewable biomass fraction (f_NRB, Altiplano): estimated 0.80–0.95 (high due to degraded ecosystem)
• Fuel consumption per HH per year (boiling): ~500–700 kg dry biomass (estimated, altitude-adjusted)
• Emission factor for biomass combustion: 1.74 kg CO₂e/kg dry biomass (IPCC Tier 1)
• Annual emission reductions (conservative): 10,000 HH × 0.65 × 0.85 (f_NRB) × 600 kg × 1.74 kgCO₂e/kg = ~5,750 tCO₂e/year
• Estimated credit yield per household served: ~0.58 tCO₂e/HH/year

At a conservative carbon price of $5/tCO₂e (lower bound for certified water project credits in current VCM), this translates to approximately $2.90 per household per year in gross carbon revenue, or ~$28,750/year for the 10,000-household project. At $10/tCO₂e (mid-range for GS-certified water credits), revenue rises to ~$57,500/year.

Institutional Feasibility

Bolivia’s institutional feasibility is mixed. On the positive side, MMAyA and EMAGUA have established frameworks for community water governance, and Bolivia has experience with donor-financed rural water programs that could provide institutional anchoring for carbon project administration. SENASBA (Servicio Nacional para la Sostenibilidad de Servicios en Saneamiento Básico) has a mandate for technical assistance to rural water operators that could be leveraged for carbon project support.

The primary institutional constraint is Bolivia’s principled opposition to carbon markets at the international level, reflected in its NDC and its domestic legal framework. This does not categorically preclude VCM activity, but it does mean that: (i) obtaining government endorsement or a Letter of Authorization for international credit sales may face political resistance; (ii) government co-financing of project development costs is unlikely; and (iii) public communication of the carbon project must be carefully managed to avoid political backlash.

A viable pathway may be to structure the project explicitly as an O&M financing mechanism—emphasizing the water service quality improvements and development co-benefits—rather than framing it in carbon market language. The Gold Standard’s emphasis on SDG co-benefits (particularly SDG 6, clean water) aligns with this framing.

Operational Feasibility

Bolivia’s OCAB-based service delivery model poses significant operational challenges for carbon project development. OCABs are typically small community organizations managing single-village systems, with no professional staff and minimal administrative capacity. Aggregating across multiple OCABs to achieve project scale is technically complex but feasible under Gold Standard’s Grouped Project approach, which allows new project instances (communities) to be added under a common PDD framework.

Connectivity in the Altiplano is improving but remains limited. Cellular coverage (primarily Entel, Tigo) reaches most departmental and municipal centers, but many rural communities operate in coverage gaps. LoRaWAN gateway deployment as part of Virridy sensor infrastructure could provide data backhaul in areas without cellular coverage, enabling sensor-based MRV even in remote locations.

Financial Feasibility

The financial case for Bolivia rests on two favorable factors: high biomass dependence (supporting credit yield) and a large rural population with meaningful coverage gaps. Against this, transaction costs for project development and certification are high relative to individual system scale, making aggregation essential. Bolivia’s LDC-equivalent status (it is classified as a lower-middle income country, not an LDC) means it does not benefit from Gold Standard fee waivers available to LDC projects; project development costs should be budgeted at full commercial rates.

An indicative financial model for a 20,000-household aggregated project in the Altiplano suggests a 10-year NPV (at 8% discount rate, $6/tCO₂e average price) of approximately $180,000–$260,000 in net carbon revenue after MRV and certification costs—equivalent to roughly $1.00–$1.50/HH/year net contribution to O&M, or approximately 10–20% of the O&M funding gap. While modest, this supplemental revenue stream is meaningful in a context where no other systematic O&M financing mechanism exists.

C. Opportunities and Constraints

D. Viability Classification

Brazil

A. Country Context

Rural Water Sector Overview

Brazil is South America’s largest economy and most populous country, with approximately 215 million people as of 2023. Rural population represents roughly 14% of the national total, or approximately 30 million people—the largest rural population among the four priority countries in absolute terms. Despite Brazil’s middle-income status and extensive urban water infrastructure, rural water access remains deeply unequal and regionally fragmented.

JMP 2023 estimates place Brazil’s rural safely managed water coverage at approximately 33%—a figure that masks enormous regional disparities. In the Northeast region (Nordeste), home to Brazil’s largest concentration of rural poor, safely managed water access falls to 15–20% in many states (Maranhão, Piauí, Alagoas, Ceará), with a large share of the rural population depending on seasonal surface sources or rainwater harvesting (cisternas) with limited water quality assurance. In contrast, Southern and Southeastern rural areas have substantially higher coverage, reducing the addressable carbon project population in those regions.

Brazil’s rural water governance is complex and fragmented. The National Basic Sanitation Law (Law 14,026/2020) established new frameworks for sanitation concessions and regional service aggregation, but implementation remains uneven. The Programa Nacional de Apoio à Captação de Água de Chuva e Outras Tecnologias Sociais de Acesso à Água (Programa Cisternas) under the Ministry of Social Development has reached millions of Nordeste households, creating an institutional footprint but not necessarily safely managed water as defined under international standards.

Household Water Treatment Practices and Fuel Sources

Brazil’s household energy profile is distinct among the four priority countries: LPG is the dominant cooking fuel even in rural areas, with approximately 90% of rural households using LPG for cooking (PNAD data). This has critical implications for carbon methodology applicability—TPDDTEC requires displacement of non-renewable biomass, and LPG combustion does not qualify. However, a meaningful minority of rural Nordeste households (estimated 15–30% in the poorest municipalities) continues to rely on fuelwood (lenha) for cooking, with boiling water as part of cooking activities rather than a standalone treatment practice.

The key question is whether rural households in target areas are actually boiling water for treatment using biomass (as opposed to using treated water from cisterns or other sources without boiling). In Nordeste context, where households frequently access cisterna water of questionable quality, household treatment practices including boiling are plausible but not well-documented in recent surveys. The fraction of households using non-renewable biomass for any energy purpose, which is required for TPDDTEC baseline construction, is substantially lower in Brazil than in Bolivia, Haiti, or Peru’s highland areas.

This structural characteristic significantly reduces per-household credit yield in Brazil compared to the other three countries and complicates methodology application. GS Safe Water may be more appropriate than TPDDTEC in some Brazil contexts, depending on the specific intervention type.

Climate and Biophysical Conditions

The priority region for carbon-linked water projects in Brazil is the semi-arid Nordeste (Semiárido), characterized by annual rainfall of 200–800mm with high inter-annual variability and frequent multi-year droughts. The 2012–2016 drought, the most severe on record for the region, caused widespread cisterna depletion and forced households to rely on truck-delivered water (carros-pipa) of variable quality. Climate projections consistently indicate increasing aridity and rainfall variability in the Nordeste, making water access improvement both more urgent and more technically challenging.

The biophysical context also determines non-renewable biomass fractions. The Caatinga biome that covers much of the Nordeste is an important carbon stock and biodiversity ecosystem, but has been heavily degraded by fuelwood harvesting. Fuelwood collection from Caatinga may have high non-renewability fractions in heavily degraded areas, supporting carbon credit eligibility where biomass use for boiling is documented.

B. Feasibility Assessment

Technical Feasibility

Brazil’s technical feasibility is driven by scale—the Nordeste rural population is enormous—but constrained by low biomass dependence relative to the other priority countries. Indicative estimates for a Nordeste rural water project serving 20,000 households are presented:

• Household population: 20,000 HH × 3.8 persons/HH = 76,000 persons
• Estimated boiling prevalence using non-renewable biomass: ~20% of households (conservative; higher in poorest municipalities)
• Non-renewable biomass fraction (f_NRB, Caatinga fuelwood): estimated 0.65–0.80
• Fuel consumption per boiling HH per year: ~400–600 kg dry biomass
• Annual emission reductions (conservative): 20,000 HH × 0.20 × 0.70 × 500 kg × 1.74 kgCO₂e/kg = ~2,436 tCO₂e/year
• Estimated credit yield per household served (all households): ~0.12 tCO₂e/HH/year

The low per-household credit yield in Brazil reflects the low proportion of households using biomass for boiling. Carbon revenue at $6/tCO₂e would yield approximately $0.73/HH/year gross—insufficient alone to meaningfully address O&M financing gaps. Technical feasibility in Brazil is therefore predicated on finding municipalities or communities where biomass dependence is atypically high, or on identifying project structures that generate credits across a very large (100,000+) household population where aggregate volumes become commercially significant.

Institutional Feasibility

Brazil’s institutional environment is the most favorable among the four countries from a carbon market perspective. Brazil’s SINARE national carbon registry framework, established by Presidential Decree No. 11,550 (2023), provides a domestic regulatory foundation for VCM activity. Brazil’s active participation in Article 6 negotiations and its commercially sophisticated carbon sector (Brazil is the world’s largest REDD+ credit supplier) creates institutional familiarity with certification processes.

However, the water sector in Brazil operates largely separately from the carbon market ecosystem. The National Sanitation Agency (ANA), state sanitation agencies (SAEs), and municipal utilities (SAAEs) that govern rural water services have no established engagement with carbon markets. Bridging this institutional gap—connecting rural water governance to carbon market infrastructure—requires deliberate intermediary support, which the consortium could provide.

Brazil’s federalized governance structure means that state-level political will matters as much as federal policy. States with strong rural development agendas and water access gaps (Ceará, Pernambuco, Bahia in the Nordeste) may be more receptive entry points than federal programs.

Operational Feasibility

Brazil’s rural water service delivery is predominantly through simplified community systems (SAAs Simplificados) and alternative solutions (including cisternas), with operational management typically at the municipal level. The diversity of service models and operators complicates standardization of MRV systems. Brazil’s relatively strong digital infrastructure (cellular and internet coverage reaching most municipalities) is a significant operational advantage for digital MRV implementation. The existence of national programs like Programa Cisternas creates potential for carbon project integration at scale, provided the institutional pathway for O&M revenue retention by local operators can be established.

Financial Feasibility

Despite low per-household credit yields, Brazil’s scale creates a pathway to financial viability through aggregation. A program aggregating 100,000–200,000 Nordeste rural households with above-average biomass dependence could generate 12,000–30,000 tCO₂e/year, supporting gross carbon revenues of $72,000–$180,000/year at $6/tCO₂e. At this scale, project development and MRV costs become manageable, and the carbon revenue stream, while modest per household, provides a meaningful supplement to O&M financing.

The financial argument in Brazil is further strengthened if carbon credits are bundled with water quality certificates or SDG impact claims that command premium prices ($10–$15/tCO₂e) in corporate ESG procurement markets.

C. Opportunities and Constraints

D. Viability Classification

Haiti

A. Country Context

Rural Water Sector Overview

Haiti is the poorest country in the Western Hemisphere and presents the most severe humanitarian context among the four priority countries. With a population of approximately 11.5 million (2023), of whom roughly 45% reside in rural areas (~5 million people), Haiti combines acute water access deficits with governance collapse, political instability, and repeated natural disaster impacts.

JMP 2023 data places Haiti’s rural safely managed water coverage at approximately 4%—among the lowest in the Western Hemisphere and lower than many Sub-Saharan African countries. Approximately 53% of Haiti’s rural population uses unimproved water sources (unprotected wells, surface water). Basic water access is estimated at 44% of rural population. These figures reflect both pre-existing infrastructure deficits and the destruction caused by the 2010 earthquake, Hurricane Matthew (2016), and the 2021 earthquake, as well as the progressive collapse of rural water service governance since 2019.

Haiti’s water sector governance has historically been fragmented between the DINEPA (Direction Nationale de l’Eau Potable et de l’Assainissement) at the national level and local water operators (OREPA regional offices, CASECs, and independent community committees). The DINEPA was substantially weakened by successive political crises; as of 2024, its operational capacity is severely constrained. International NGOs and bilateral donors (USAID, UNICEF, USCD, various European agencies) provide most operational support to rural water systems, creating a fragmented, donor-dependent service delivery landscape.

The security crisis that has engulfed Haiti since 2021—with armed gang control of major urban areas and increasing rural insecurity—directly affects project implementation feasibility. While rural areas outside metropolitan Port-au-Prince are less severely affected, field staff safety and supply chain reliability must be assessed on a case-by-case basis.

Household Water Treatment Practices and Fuel Sources

Boiling is pervasive in rural Haiti and represents the primary household water treatment practice for the vast majority of rural households that do not have access to chlorinated or filtered water. Survey data from DINEPA and UNICEF household assessments prior to 2020 suggests boiling prevalence in rural Haiti of 60–75%, with charcoal (charbon) and fuelwood (bwa) as the dominant fuel sources.

Haiti’s biomass energy dependency is extreme: charcoal and wood account for approximately 70–80% of total national energy consumption, making Haiti one of the most biomass-dependent countries in the hemisphere. This fuel dependence has driven catastrophic deforestation—Haiti’s forest cover is estimated at less than 4% of land area, compared to over 60% in neighboring Dominican Republic. The ecological crisis of deforestation means that charcoal production is entirely non-renewable in most Haitian contexts—f_NRB values approaching 1.0 can be justified across most of the country, which maximizes carbon credit eligibility per unit of displaced fuel.

The very high f_NRB values and high boiling prevalence theoretically create the highest per-household credit yield potential of any of the four countries. Indicative calculations suggest 0.7–1.1 tCO₂e per household per year for a project displacing biomass-based boiling—significantly higher than Bolivia, Brazil, or Peru under comparable parameters.

Climate and Biophysical Conditions

Haiti is highly vulnerable to climate-related hazards including hurricanes, droughts, and floods. The combination of deforestation and climate variability has severely degraded watershed functions, making water source reliability extremely low in many rural areas. Climate change projections indicate increasing hurricane intensity and rainfall variability, with significant implications for rural water infrastructure durability. The biophysical collapse of Haiti’s ecosystems also means that non-renewable biomass fractions are essentially 1.0 throughout the country—there is no renewable biomass remaining in most areas, a fact that is simultaneously a driver of carbon credit eligibility and a marker of the ecological crisis that water access improvements must help address.

B. Feasibility Assessment

Technical Feasibility

Haiti has the highest theoretical per-household credit yield among the four countries due to extreme biomass dependence, near-total non-renewability, and high boiling prevalence. An indicative calculation for a rural water project serving 5,000 households:

• Household population: 5,000 HH × 4.5 persons/HH = 22,500 persons
• Estimated boiling prevalence: ~70%
• Non-renewable biomass fraction (f_NRB): ~0.95 (near-complete deforestation)
• Charcoal consumption per boiling HH per year: ~400–600 kg (charcoal has higher emission factor than fuelwood per kg but lower per unit energy)
• Emission factor for charcoal combustion: ~3.0 kg CO₂e/kg (including production emissions)
• Annual emission reductions (conservative): 5,000 HH × 0.70 × 0.95 × 500 kg × 3.0 = ~4,988 tCO₂e/year
• Estimated credit yield per household served: ~1.0 tCO₂e/HH/year

At $6/tCO₂e, this yields approximately $6/HH/year in gross carbon revenue—the highest of any country in this assessment and potentially sufficient to cover a substantial fraction of rural water O&M costs. The technical potential is genuinely exceptional.

Institutional Feasibility

Haiti’s institutional feasibility for carbon project development is extremely low in the current context. DINEPA, the natural institutional partner for a water carbon project, has severely reduced operational capacity. Haiti’s government has been unable to organize national elections since 2019, and the country is currently governed by a Transitional Presidential Council with limited administrative reach outside Port-au-Prince. Obtaining any form of government authorization for a carbon project—including the Letter of Authorization required for internationally transactable credits under Gold Standard—would require engagement with an unstable and fragmented government apparatus.

Haiti’s NDC, submitted under the Paris Agreement, explicitly identifies carbon finance and technology transfer as essential support mechanisms, and its INDC commitments are entirely conditional on international finance. This creates a formal policy opening for carbon project development, but translating that policy position into operational authorizations given the current governance situation is uncertain.

Operational Feasibility

Operational feasibility is the binding constraint in Haiti. Rural water systems, to the extent that they function, are operated by community water committees (Comités d’Eau Potable et d’Assainissement, CEPAS) or NGO-supported programs with no formal revenue systems, no data management capacity, and no connection to carbon market infrastructure. Digital connectivity is very limited in rural areas. NGO partners with established presence (IRC, CARE, Catholic Relief Services, SOIL) provide the most viable operational anchors for any project activity.

COVA’s experience in Central America, while geographically distinct, provides relevant precedent for NGO-anchored safe water programs in fragile institutional contexts. COVA’s operational and monitoring frameworks could potentially be adapted to Haiti with appropriate localization.

Financial Feasibility

Haiti’s LDC status (it is on the UN LDC list) creates meaningful financial advantages within Gold Standard: reduced application fees, simplified documentation requirements, and eligibility for GS Gold Standard for the Global Goals LDC pricing. At the same time, the incremental cost of operating in Haiti—higher field staff costs, security protocols, logistics complexity, and risk contingencies—substantially elevates project development and management costs relative to the other three countries. A realistic cost model would likely double the standard project development budget used for Bolivia or Peru.

The financial case may nonetheless be viable for large-scale, NGO-anchored programs where the carbon project is embedded within an existing humanitarian or development program with established operational infrastructure. Standalone carbon project development in Haiti is not recommended without an existing operational anchor organization.

C. Opportunities and Constraints

D. Viability Classification

Peru

A. Country Context

Rural Water Sector Overview

Peru has a population of approximately 33 million (2023), of whom roughly 22% reside in rural areas (~7 million people). Peru’s rural water sector is geographically diverse, spanning three distinct ecological zones: the coastal strip (Costa), the Andean highlands (Sierra), and the Amazon basin (Selva). The Sierra, home to approximately 40% of Peru’s rural population and concentrated in highland indigenous communities (many Quechua-speaking), presents the most relevant context for carbon-financed water interventions.

JMP 2023 estimates place Peru’s rural safely managed water coverage at approximately 32%, with substantial variation by region: coastal rural areas have higher coverage (~45%), while Sierra and Selva rural coverage is significantly lower (~25% and ~15%, respectively). Peru’s rural water sector is governed through the Ministry of Housing, Construction and Sanitation (MVCS), with rural water specifically under the Programa Nacional de Saneamiento Rural (PNSR). Service delivery is predominantly through Juntas Administradoras de Servicios de Saneamiento (JASS), community-level operators analogous to Bolivia’s OCABs, which manage systems with support from PNSR-contracted regional operators (Operadores Especializados, OE).

Peru’s PNSR has made substantial investments in rural water infrastructure over the past decade, and recent programmatic shifts have emphasized service sustainability and the JASS strengthening model. IDB has been an active financing partner of Peru’s rural water sector, with multiple operations financing PNSR activities. This existing relationship provides a direct entry point for carbon finance integration within IDB-financed programs.

Household Water Treatment Practices and Fuel Sources

Rural boiling prevalence in Peru’s Sierra is high and well-documented through ENDES (Encuesta Demográfica y de Salud Familiar) survey data. ENDES 2022 reports that approximately 50–65% of rural Sierra households report boiling as their primary water treatment method. In the highest-altitude communities (over 3,500m), where piped water systems often lack chlorination and water quality is uncertain, boiling rates may approach 70–80%.

Fuel sources for boiling in the Sierra are predominantly biomass: dried dung (estiércol) and fuelwood from degraded highland ecosystems (jalca, puna), with LPG as a secondary source in communities with road access. A national survey of cooking fuels (ENAHO, Encuesta Nacional de Hogares) indicates that approximately 60–70% of rural Sierra households use solid biomass as their primary cooking fuel, with this proportion declining gradually with road access and market integration. Non-renewable biomass fractions in the Andean highlands of Peru are likely high (0.7–0.9) due to the scarcity and ecological fragility of high-altitude ecosystems, though specific f_NRB assessments would need to be conducted as part of project development.

Peru is also notable for the prevalence of household biomass use coinciding with high altitude, which, as noted for Bolivia, reduces the boiling point and potentially the fuel quantity required per boiling event—a nuance for emission factor calculations.

Climate and Biophysical Conditions

Peru’s Andean Sierra faces significant climate-related water stress, including accelerating glacier retreat (Peru holds approximately 70% of the world’s tropical glaciers, most of which are retreating rapidly), increased precipitation variability, and seasonal water availability challenges. Glacier retreat is directly affecting water availability for rural communities that depend on glacial meltwater for dry season flows. Climate change projections indicate decreasing dry season water availability in many Sierra watersheds, which will increase rural communities’ vulnerability to water service disruption and strengthen the case for investment in water system O&M and reliability. This climate vulnerability, combined with Peru’s NDC commitments in the water and adaptation sectors, creates alignment between carbon project objectives and national climate priorities.

B. Feasibility Assessment

Technical Feasibility

Peru’s technical feasibility is strong, driven by well-documented high boiling prevalence, significant biomass dependence, and a large rural highland population with established community water governance. Indicative emission reduction calculations for a hypothetical project serving 15,000 rural Sierra households:

• Household population: 15,000 HH × 4.2 persons/HH = 63,000 persons
• Estimated boiling prevalence (pre-intervention, Sierra): ~60%
• Non-renewable biomass fraction (f_NRB, Sierra highlands): estimated 0.75–0.88
• Fuel consumption per boiling HH per year: ~550 kg dry biomass (altitude-adjusted)
• Annual emission reductions (conservative): 15,000 HH × 0.60 × 0.80 × 550 kg × 1.74 kgCO₂e/kg = ~6,890 tCO₂e/year
• Estimated credit yield per household served: ~0.46 tCO₂e/HH/year

At $6/tCO₂e, this yields approximately $2.75/HH/year in gross carbon revenue, or ~$41,340/year for the 15,000-household project. This is comparable to the Bolivia estimate on a per-household basis and, at project scale, is sufficient to support net positive economics after MRV and certification costs for a well-designed aggregated program.

Institutional Feasibility

Peru’s institutional feasibility is the highest of the four countries. Key enabling factors include:

• Established carbon market framework: Peru’s Registro Nacional de Carbono provides a domestic authorization pathway for VCM projects. The Ministry of Environment (MINAM) has issued Letters of Authorization for REDD+ projects, establishing a precedent that may extend to water sector projects.
• PNSR and JASS institutional infrastructure: The JASS model, with regional Operadores Especializados providing technical backstop, creates a more professionally supported governance structure than Bolivia’s OCAB model. PNSR’s existing monitoring frameworks provide a foundation for carbon MRV integration.
• IDB partnership: Existing IDB-financed PNSR operations create a direct entry point for carbon finance integration within established program structures, reducing the institutional development burden of establishing carbon project governance from scratch.
• NDC alignment: Peru’s NDC includes explicit water sector adaptation commitments and mentions carbon finance as a potential support mechanism, creating favorable policy alignment.

The primary institutional constraint in Peru is the distinction between conditional and unconditional NDC commitments. Peru’s NDC clearly delineates which emission reductions the government commits to achieving with domestic resources and which require international support. Positioning the water carbon project correctly within this framework—as generating internationally transferable credits from activities not covered by domestic commitments—requires careful legal analysis and MINAM engagement.

Operational Feasibility

Peru’s operational feasibility benefits from the JASS/Operadores Especializados model, which provides more organizational capacity than a purely community-managed system. Cellular connectivity in Sierra rural areas is improving rapidly, with major carriers (Claro, Movistar, Bitel) expanding rural coverage under the Fondo de Inversión en Telecomunicaciones (FITEL) program. Many PNSR-financed systems have basic operational data (connection counts, distribution network parameters) available, providing a starting point for MRV baseline construction.

Virridy sensor technology has demonstrated applicability in Andean rural water contexts, and a pilot deployment in Peruvian communities would directly demonstrate the digital MRV pathway for carbon project development. Integration with PNSR’s existing SINAPSAN (Sistema Nacional de Información de Saneamiento) monitoring platform could enable data sharing and reduce duplication.

Financial Feasibility

Peru’s financial feasibility is supported by the combination of reasonable per-household credit yields, manageable certification costs (particularly given potential aggregation through PNSR/JASS structures), and a relatively favorable country operating cost environment compared to Haiti. An indicative 15-year NPV model for a 30,000-household aggregated project in four Sierra departments (Cusco, Puno, Apurímac, Huancavelica—where rural poverty and water access deficits are highest) suggests:

• Annual gross carbon revenue (years 1–5): ~$83,000/year at $6/tCO₂e
• MRV and verification costs: ~$25,000/year
• Project management overhead: ~$15,000/year
• Net annual carbon contribution to O&M: ~$43,000/year (~$1.43/HH/year)
• As fraction of estimated O&M gap ($10–$20/HH/year): 7–14%
• 15-year NPV (8% discount): approximately $320,000–$450,000

While the carbon revenue contribution represents only a partial solution to O&M financing, it provides a meaningful, institutionally legitimate supplemental revenue stream that can be combined with tariff reform and conditional transfer mechanisms to achieve O&M sustainability.

C. Opportunities and Constraints

D. Viability Classification

Part 3: Comparative Analysis

3.1 Comparative Feasibility Matrix

The table below scores each country across key feasibility dimensions on a 1–5 scale (1 = very low, 5 = very high), drawing on the individual country assessments. Scores are indicative and subject to revision as additional data is gathered.

Scores are indicative (1–5 scale) based on available data. Boiling prevalence, f_NRB, and O&M gap figures are estimates pending primary data collection. Composite score is unweighted mean across all dimensions.

3.2 Common Enablers and Barriers

Common Enablers Across Countries

Structural O&M financing gap. All four countries share the fundamental condition of chronic underfunding of rural water O&M, which both establishes additionality for carbon projects and creates genuine demand for supplemental revenue mechanisms. This is the most consistent cross-country enabling factor and provides a compelling development rationale that aligns with IDB’s SIRWASH program objectives.

Non-renewable biomass dependence in target populations. Despite variation in degree and geography, all four countries have target rural populations with meaningful biomass fuel dependence for household water boiling. The common thread is rural poverty and limited access to modern energy, which sustains biomass use in contexts where urban populations have largely transitioned to LPG or electricity.

Paris Agreement and NDC frameworks. All four countries are Paris Agreement signatories with submitted NDCs that create a policy framework for emission reduction activities. While government positions on VCM participation vary, the existence of NDC frameworks means that carbon project activities can be positioned within national climate commitments rather than in opposition to them.

IDB engagement. IDB’s existing rural water sector presence in all four countries—through the SIRWASH initiative and country-specific operations—provides a unique institutional entry point for carbon finance integration that would not exist for a standalone private sector developer. The consortium’s connection to IDB is a genuine competitive advantage in accessing stakeholders, data, and implementation partners.

International carbon market demand for water projects. Corporate buyers in voluntary carbon markets have shown increasing willingness to pay premium prices for credits with strong water security and SDG co-benefits. The “water+carbon” credit narrative aligns well with corporate ESG commitments in water stewardship, creating a favorable demand context for projects in all four countries.

Common Barriers Across Countries

Transaction cost barrier. Project development, validation, and registration under Gold Standard or Verra typically costs $30,000–$80,000 upfront, plus $10,000–$30,000/year in ongoing verification. For small individual water systems, this creates a minimum scale threshold—approximately 15,000–25,000 households—below which carbon revenue cannot recoup project development costs within a reasonable timeframe. Aggregation is therefore not optional but essential, and aggregation across dispersed community water systems introduces its own transaction costs.

Monitoring capacity of community water operators. All four countries rely on community-level governance for rural water service delivery, and all such operators have limited administrative and monitoring capacity. This creates a fundamental tension: carbon project MRV requires systematic, documented, verifiable monitoring that goes well beyond what community operators typically do. Closing this gap requires either significant capacity building investment or technology-mediated solutions (digital MRV) that reduce monitoring burden on operators.

Boiling data gaps. Rigorous carbon project baselines require documented boiling prevalence and fuel source data at the project population level. In all four countries, nationally available survey data (DHS, MICS, ENDES) provides some information, but community-level baseline surveys are needed for project design, introducing additional cost and time.

Carbon credit price uncertainty. Carbon credit prices in voluntary markets have been volatile since 2022, with significant uncertainty about future pricing. Financial models for rural water carbon projects depend heavily on achievable prices; a market price decline from $6 to $3/tCO₂e would roughly halve the O&M contribution, potentially making projects financially unviable. Project financial models should include price sensitivity analysis and stress test against low-price scenarios.

Article 6 and corresponding adjustment uncertainty. The evolving Article 6 framework creates uncertainty about whether VCM credits generated in these countries require corresponding adjustments. If countries apply CAs to their NDC accounting for all credits sold internationally, this may not affect VCM project operations directly but could influence government willingness to authorize credit sales. Resolution of this uncertainty is important for project design.

3.3 Implications for D3 Regional Screening

The country-level assessments inform the D3 regional screening in three ways: (i) they identify the specific enabling conditions that distinguish high-viability from low-viability contexts; (ii) they provide calibrated scoring parameters (boiling prevalence ranges, f_NRB estimates, institutional dimensions) that can be applied consistently across the broader set of up to twelve LAC countries; and (iii) they surface the data availability constraints that will affect scoring confidence across the regional set.

Key Variables for D3 Screening Framework

Based on the country assessments, the D3 screening framework should prioritize the following variables as highest predictive value for carbon finance viability:

1. Boiling prevalence and biomass fuel dependence — the primary technical driver of credit yield; should be estimated for each country from available DHS/MICS data, with uncertainty bounds noted.
2. Government VCM openness and Article 6 position — determines whether internationally transactable credits can be generated; countries with anti-market NDC positions (like Bolivia) face structural political barriers regardless of technical potential.
3. Service provider aggregation capacity — the availability of a programmatic aggregation vehicle (national program, NGO network, or sectoral utility) is essential for achieving the scale required for cost-effective carbon project development.
4. Digital infrastructure — cellular or LoRaWAN connectivity is a necessary condition for digital MRV deployment, which is in turn required for cost-effective MRV at scale.
5. Rural water coverage gap — the size of the addressable population (households without safely managed water) determines the upper bound of project scale.

Provisional Country Typology for Regional Screening

Based on the four country assessments, a provisional typology for the D3 regional screening can be proposed:

• Type A: High viability. Countries with high boiling prevalence, established carbon market framework, and programmatic aggregation capacity. Peru is the clearest Type A country in this assessment; Ecuador, Colombia, and Guatemala may qualify for this type based on similar Andean/highland characteristics.
• Type B: Conditional viability (scale opportunity). Countries where individual credit yields are low but population scale creates aggregate potential. Brazil is the Type B exemplar; Mexico and potentially Argentina may fall in this category.
• Type C: Conditional viability (political/institutional constraint). Countries with strong technical potential but political or institutional barriers to VCM participation. Bolivia exemplifies this type; Venezuela, Nicaragua, and potentially Ecuador (depending on political trajectory) may fit here.
• Type D: Low viability (enabling conditions required). Countries with genuine technical potential but severe operational or governance constraints. Haiti is the Type D exemplar; fragile states with limited institutional capacity elsewhere in the Caribbean or Central America may share this profile.

D3 will populate this typology across the broader regional set, using the variables identified above and the scoring framework developed from this assessment. Countries with insufficient data for confident classification will be flagged as requiring additional analysis before the D4 synthesis and decision-support tool development.

Strategic Recommendation

The comparative analysis supports a sequenced implementation strategy: pursue Peru as the primary pilot country for carbon project development, drawing on IDB PNSR relationships and the JASS aggregation model; develop Bolivia as a parallel pilot with modified approach to navigate anti-market political constraints; incorporate Brazil into a longer-term program development track targeting Nordeste NGO partnerships; and treat Haiti as a monitoring and preparedness case, ready to accelerate if political stabilization permits.

This sequenced strategy is consistent with IDB’s operational capacity constraints and provides a portfolio approach that distributes risk: if Peru or Bolivia pilots succeed, they generate the proof-of-concept evidence needed to mobilize action in Brazil and Haiti. If they face unexpected constraints, learning can be incorporated before committing resources to the more challenging contexts.