Virridy Home | Lume — Water Quality Sensing Water for Carbon

Amazi Meza Rwanda
Water Treatment Program

Fast Company World-Changing Ideas Award Winner
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Schools Currently Served
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Students Reached
1,500
Schools by 2028
1.5M
Students by 2028
13
Peer-Reviewed Publications

Gold Standard Carbon Credit Issuance

Verified carbon emission reductions under Gold Standard GS12240

16,153 tCO2eVPA1 — Certified Sep 2024
17,758 tCO2eVPA2 — Pending certification
33,911 tCO2eTotal issued
200,000 tCO2eProjected by 2028
33,911 tCO2e issued (17%) 200,000 tCO2e target
Program Overview

Clean Water for Rwanda's Schools

Diarrheal disease, driven in part by unsafe drinking water, remains a major contributor to morbidity among children in Rwanda. A large-scale, school-based drinking water filtration program launched in 2023 currently serves over 500 schools and approximately 600,000 students, with expansion planned to more than 1,500 schools and 1,500,000 students by 2028.

The program is implemented in partnership with the Rwanda Environmental Management Authority and district governments, operated by Virridy Rwanda Ltd, and sustainably financed through the sale of carbon credits.

Proven Health & Economic Impact

The Virridy management team led the first-ever United Nations Clean Development Mechanism and Gold Standard programs earning carbon credits for water treatment. From 2012–2016, over 101,000 households in western Rwanda received LifeStraw water filters and EcoZoom cookstoves, with an additional 250,000 cookstoves reaching nearly one million more people.

Independent evaluation by the London School of Hygiene & Tropical Medicine and Emory University demonstrated:

  • 29% reduction in diarrhea among children under five
  • 25% reduction in acute respiratory infection among children under five
  • 65,000 tons of fuelwood saved, reversing regional deforestation
  • $66M+ in benefits over five years on a $12M investment
Read the full analysis →
Live Data

School Map & Water Quality

Amazi Meza School Water Points

Rwanda

Schools
Districts
Population Served
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    Water Quality

    Virridy regularly tests both baseline and project-level water quality to ensure microbial safety at the point of collection and the point of use, consistent with the Gold Standard methodology. We use Compartment Bag Tests (CBTs) to enumerate fecal microbial contamination across a representative sample of schools at least once per year.

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    Amazi Meza Program Implementation

    The standard process for program implementation in a new district follows a structured sequence from feasibility through ongoing monitoring and maintenance.

    Feasibility Review

    Conducted by East Africa Programs Manager to determine the next set of priority districts based on criteria such as number of public schools in district, geographic and climatic variables influencing water availability and access, and logistics for accessing schools in the district.

    District-Level Agreements

    Secured by Rwanda Climate Finance Director to ensure that District Government leadership is familiar with the program, understands school eligibility criteria and the commitments of schools and Virridy Rwanda, and agrees to implementation in schools in their district. This process also includes obtaining an up-to-date list of all schools in the district.

    School Eligibility Screening Survey

    Conducted by Survey Team through phone calls to school headmasters to determine whether schools are eligible for baseline survey based on the following criteria:

    1. School is not on utility distribution network
    2. School has not treated water for students with advanced treatment in the last 3 months
    3. School is publicly funded (not exclusively private)
    4. School has at least 400 students
    5. School has access to water year round

    The mWater screening survey tool can be viewed here. Once all schools in a district have been screened, the data is reviewed to identify the list of schools eligible for in-person baseline surveying.

    Baseline Survey

    Conducted by Survey Team through in-person school visits by enumerator pairs to verify data initially collected through Screening Survey, gather more in-depth data on the school and its water collection and treatment practices, and map and test the quality of its drinking water sources.

    Once all baseline-eligible schools have been visited and surveyed, the data is reviewed to identify schools eligible for implementation based on:

    1. Water from drinking water source(s) is always or mostly available (unavailable for 30 days or less per school year)
    2. No advanced treatment for student drinking water in the last 3 months
    3. Drinking water is not supplied by utility connection
    4. At least one drinking water source tested positive for E. coli contamination

    Filter Installation & Training

    Monitoring

    Carried out for two purposes using the same monitoring survey tool, with logic built in to determine questions asked depending on purpose.

    Gold Standard Reporting

    • Annual, in-person monitoring site visit and survey at randomly selected schools, sampled to meet Gold Standard requirements
    • Annual water quality testing of treated water from all filters at each of the randomly selected schools

    Programmatic Activities

    • Monitoring calls conducted every 6 months to determine schools needing in-person visits for filter repair or replacement
    • In-person monitoring surveys conducted when schools are visited for repair and replacement, including refresher training

    Repair & Replacement

    Informed by monitoring activities and calls from schools to report filter issues. Needs are determined through the Issue Report Form and the mWater Issue Tracking System.

    Two Parallel Approaches

    1. Campaigns — Twice a year (typically January and July/August), all Field Technicians are dedicated to addressing identified needs from monitoring calls
    2. Ongoing — A dedicated Field Technician addresses issues that could not be resolved during campaigns, plus new issues reported by schools between campaigns

    Cleaning Campaign

    Conducted within two years of initiation of a given VPA for all filters in all schools, following this protocol. Schools are responsible for daily and weekly cleaning but are told not to disassemble the filter. When visited for cleaning, a monitoring survey and water quality testing are also conducted.

    Recycling & Disposal

    A Recycling and Disposal Plan is in place for end of filter lifespan. To date, this process has not been necessary for any filters.

    Partners

    Roles & Responsibilities

    Virridy Rwanda Ltd

    Project Implementer and Service Provider

    Rwanda Ministry of Health

    GOR focal point with MOU for program

    Rwanda Environmental Management Authority

    Environmental impact and DNA for LOA

    Rwanda Bureau of Standards

    Technology approval

    Rwanda Revenue Authority

    Tax free import approval

    LifeStraw SA

    Technology vendor

    Rwanda Districts

    Local approval

    Schools

    Program partners

    NovaCert / KBS

    VVBs (Validation & Verification Bodies)

    University of Colorado Boulder

    Research Partner

    Mortenson Construction

    Investor and carbon buyer

    US National Science Foundation

    Technology development funder

    Rwanda Evidence Base

    1

    Lessons from Rwanda on tackling unsafe drinking water and household air pollution

    Overview
    Overview of the large-scale carbon-financed water filter and cookstove program in western Rwanda, summarizing the 29% diarrhea reduction, 25% respiratory infection reduction, and $66M in benefits on a $12M investment.
    The Conversation • 2019
    2

    Effects of adding household water filters to Rwanda's Community-Based Environmental Health Promotion Programme

    NatureWASH
    Evaluates the integration of LifeStraw water filters into Rwanda's national community health worker program, measuring adoption rates, water quality improvements, and sustained usage over time.
    npj Clean Water • Nature • 2022
    3

    Integration of Household Water Filters with Community-Based Sanitation and Hygiene Promotion in Rwanda

    MDPIHygiene
    Examines how water filters were integrated into community-based environmental health promotion, including the role of community health workers in sustaining adoption and hygiene behavior change.
    Sustainability • MDPI • 2021
    4

    Geospatial-temporal, demographic, and programmatic adoption characteristics of a large-scale water filter and improved cookstove intervention

    GeospatialAdoption
    Spatial and temporal analysis of adoption patterns across 101,000 households in western Rwanda, identifying demographic and geographic factors that influenced uptake of water filters and cookstoves.
    Cogent Environmental Science • 2019
    5

    A cost-benefit analysis of livelihood, environmental and health benefits of a large scale water filter and cookstove distribution in Rwanda

    Cost-BenefitEconomics
    Comprehensive economic analysis finding over $66 million in total benefits over five years against $12 million in costs, including reduced fuel expenditure, health savings, and time savings for households.
    Development Engineering • 2019
    6

    Health, livelihood, and environmental impacts of a carbon-credit-financed water filter and cookstove programme in Rwanda

    LancetRCTHealth
    Landmark Lancet study demonstrating 29% reduction in diarrhea and 25% reduction in acute respiratory infection among children under five, plus significant livelihood and environmental co-benefits.
    The Lancet Planetary Health • 2018
    7

    Assessing use, exposure, and health impacts of a water filter and improved cookstove distribution programme in Rwanda

    HealthExposure
    Detailed assessment of actual household usage patterns and exposure reduction, linking filter and cookstove use to measurable health outcomes using electronic monitoring sensors.
    Semantic Scholar • 2017
    8

    Use, microbiological effectiveness and health impact of a household water filter intervention in rural Rwanda

    MicrobiologyHealth
    Measures microbiological effectiveness of LifeStraw filters in real-world conditions, documenting E. coli removal rates and associated reductions in waterborne disease among rural households.
    International Journal of Hygiene and Environmental Health • 2017
    9

    Study design of a cluster-randomized controlled trial to evaluate a large-scale distribution of cook stoves and water filters in Western Province, Rwanda

    RCTStudy Design
    Details the rigorous cluster-randomized controlled trial methodology used to evaluate the program, conducted in partnership with London School of Hygiene & Tropical Medicine and Emory University.
    Contemporary Clinical Trials Communications • 2016
    10

    Process evaluation and assessment of use of a large scale water filter and cookstove program in Rwanda

    Process Evaluation
    Process evaluation examining implementation fidelity, adoption barriers, and usage sustainability across 101,000 households, providing lessons for scaling environmental health interventions.
    BMC Public Health • 2016
    11

    Designing and Piloting a Program to Provide Water Filters and Improved Cookstoves in Rwanda

    PilotDesign
    Documents the pilot phase design and implementation, including technology selection, distribution logistics, community engagement strategies, and initial uptake results across pilot districts.
    PLOS ONE • 2014
    12

    Assessing the Impact of Water Filters and Improved Cook Stoves on Drinking Water Quality and Household Air Pollution

    RCTAir Quality
    Randomized controlled trial measuring objective improvements in drinking water quality (E. coli reduction) and household air pollution (PM2.5 reduction) from filter and cookstove use in Rwanda.
    PLOS ONE • 2014
    13

    Use of Remotely Reporting Electronic Sensors for Assessing Use of Water Filters and Cookstoves in Rwanda

    IoTSensors
    Pioneering study using IoT sensors (SweetSense/Virridy technology) to objectively measure actual household use of water filters and cookstoves, demonstrating the value of remote monitoring for program evaluation.
    Environmental Science & Technology • ACS • 2014
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