Company lists · Data refreshed September 2026
Top 25 Clean water charities worldwide
RevenueBase identified 637 clean water charities worldwide as of September 2026 and tracks 8,389 professional contacts across them, including 2,215 with verified work emails. The United States is the largest market and London the largest hub.
This list covers clean water charities worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026. Country and city lists for clean water charities follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest clean water charities worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,206 contacts → | ||||
Partial evidence “WaterAid is an international charity with one goal: to change the world through water.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 642 contacts → | ||||
Partial evidence “We believe there's a smart way to end the global water crisis.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 500 contacts → | ||||
Partial evidence “Water For People promotes the development of high-quality drinking water and sanitation services accessible to all – sustained by strong communities, businesses, and governments.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 312 contacts → | ||||
Strong evidence “charity: water is a non-profit bringing clean and safe drinking water to people around the world.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 216 contacts → | ||||
Partial evidence “Impact Water provides safe drinking water solutions to over partner schools, supporting 24 million students daily.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 197 contacts → | ||||
Partial evidence “WaterHealth International (WHI) is a global leader in providing access to safe, WHO-quality affordable drinking water to underserved communities.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 166 contacts → | ||||
Partial evidence “Water, Sanitation and Hygiene Institute (WASH Institute) is a registered NGO established in 2008 in Kodaikanal, Tamil Nadu.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 105 contacts → | ||||
Strong evidence “Viva con Agua de Sankt Pauli is an organisation committed to ensuring that all people worldwide have access to clean drinking water.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 102 contacts → | ||||
Partial evidence “Transforming lives and sharing God's love through sustainable access to safe water, sanitation, and hygiene in the places that need it most.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 95 contacts → | ||||
Partial evidence “Safe Water Network is a dynamic non-profit organization committed to delivering innovative and sustainable solutions for safe water access in underserved communities.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 92 contacts → | ||||
Strong evidence “Wine To Water is a global nonprofit committed to loving and serving through the power of clean water.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 79 contacts → | ||||
Partial evidence “Naandi Water is a new generation community social enterprise with a mission to save lives by providing safe drinking water to the underserved in a sustainable way.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 78 contacts → | ||||
Strong evidence “Amazi Water is the primary, in-country partner for clean water projects in Burundi.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 77 contacts → | ||||
Partial evidence “It's not just about scarcity: the systems that should give people access to safe water and sanitation either don't exist or are breaking down, on a massive scale, across the world.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 75 contacts → | ||||
Strong evidence “According to the World Bank: 2.2 billion people lack access to clean drinking water; 4.2 billion people lack access to safely managed sanitation services (e.g, toilets); 3 billion…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 71 contacts → | ||||
Partial evidence “Aquaya is a nonprofit research and consulting organization dedicated to improving safe water, sanitation, and hygiene (WASH) in low- and middle-income countries through science…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 69 contacts → | ||||
Partial evidence “Splash is a nonprofit organization that designs child-focused water, sanitation, hygiene (WASH), and menstrual health solutions for governments in some of the world’s biggest…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 69 contacts → | ||||
Partial evidence “At LifeStraw our mission is simple, we believe everyone deserves equitable access to safe drinking water.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 67 contacts → | ||||
Partial evidence “Water is life.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 62 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 55 contacts → | ||||
Partial evidence “The Water Project, Inc, a dedicated 501(c)(3) non-profit, strives to alleviate the water crisis in sub-Saharan Africa, where water stress is notably higher than in many other…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 54 contacts → | ||||
Partial evidence “Thirst Project is the world’s largest youth water organization.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 50 contacts → | ||||
Indirect evidence “Simavi is an independent international non-profit organisation.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 48 contacts → | ||||
Strong evidence “DigDeep is a human rights nonprofit working to ensure every person in the United States has access to clean running water and sanitation at home.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 43 contacts → | ||||
Partial evidence “People have always gathered around water to build.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: clean water charities. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names clean water charities.
- Partial evidence
- Its own public description names part of clean water charities, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name clean water charities. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 637 clean water charities worldwide
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Clean water charities worldwide at a glance
As of Sep 19, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among clean water charities, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for clean water charities are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “clean water charities”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names clean water charities), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among clean water charities, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 2,215 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Clean water charities by location
3 lists · largest firstEvery Clean water charities list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names clean water charities, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many clean water charities are there worldwide?
RevenueBase identified 637 clean water charities worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Wateraid, headquartered in London, tops this list with the largest team on record.
Which country has the most clean water charities?
The United States leads with 205 companies, followed by the United Kingdom (29) and India (25). Every clean water charities list by country and city is linked on this page.
Which city has the most clean water charities?
London leads with 16 headquartered companies, followed by Los Angeles (10) and Nairobi (8).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,215 verified decision-maker contacts tracked across these 637 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.