Verified carbon emission reductions under Gold Standard GS12240
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.
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.
The standard process for program implementation in a new district follows a structured sequence from feasibility through ongoing monitoring and maintenance.
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.
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.
Conducted by Survey Team through phone calls to school headmasters to determine whether schools are eligible for baseline survey based on the following criteria:
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.
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:
Completed by the Field Technician team, working in pairs.
Carried out for two purposes using the same monitoring survey tool, with logic built in to determine questions asked depending on purpose.
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.
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.
A Recycling and Disposal Plan is in place for end of filter lifespan. To date, this process has not been necessary for any filters.
Project Implementer and Service Provider
GOR focal point with MOU for program
Environmental impact and DNA for LOA
Technology approval
Tax free import approval
Technology vendor
Local approval
Program partners
VVBs (Validation & Verification Bodies)
Research Partner
Investor and carbon buyer
Technology development funder