International Rainwater Harvesting Alliance

The International Rainwater Harvesting Alliance (IRHA) is a Swiss non-governmental organisation based in Geneva since 2002. IRHA's mandate is to promote rainwater as a sustainable solution to water scarcity, natural disasters that undermine ecosystems and communities.


Our work is based on the implementation of rainwater management projects in developing countries where access to clean water and vulnerability to climate change are daily problems, directly and negatively impacting the lives of thousands of people.

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2 Billion

people still lack basic hygiene services




Programme 1

Rainwater for Water, Sanitation and Hygiene

Access to safe water and sanitation, as well as appropriate hygiene, is a human right and can prevent a significant proportion of water-related diseases.

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Programme 2

Rainfed Agriculture and Food Sovereignty

Rainfed agriculture represents more than 85% of family farming today. Ongoing climate change is impacting on the harvests and food sovereignty of farming communities.

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Programme 3

Disaster risk management and ecosystem restoration

The weakening of forest, mangrove and wetland ecosystems, which helps reduce exposure to major risks, increases the vulnerability of communities to the effects of climate change.

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Programme 4

Urban Rainwater

Storm rain, flooding, creating islands of coolness, rainwater management in the city has emerged in recent years as a nature-based solution (NbS) that cannot be ignored in managing a sustainable city.

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Programme 5


Alliance of partner organisations involved in the implementation of sustainable rainwater management solutions on all continents.

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Countries of Operations

IRHA develops projects in areas where the needs are felt, where the conditions for long-term work exist and where we have local partners, who are solidly anchored locally and capable of ensuring the sustainability of investments.

IRHA has developed strong relationships with a network of national rainwater organisations (Alliance) with whom we maintain close links, particularly for advocacy and policy making.




Image 2023 Annual report is OUT!!
12 June 2024

New programmes on watershed management in Nepal, ecosystem restoration and climate resilient agriculture in Senegal and cultura lactivities with kids in Geneva. Enjoy readying our freshly edited ...

Image IRHA online webinars 2024 : Let’s harvest rainwater !
30 May 2024


Thursday, June 27, 12:30-14:00 UTC+2

Introduction to rainwater storage technologies

Too often the short cut to rainwater harvesting is to get a plastic tank connected to the roo...

Image Café-débat : L’eau de pluie dans vos projets, vous y avez pensé ?
30 May 2024

Comment l'eau de pluie peut-elle être un levier de développement dans la quête de résilience face aux changements climatiques ? Comment peut-elle être gérée efficacement de manière simple ...

Image The contribution of rainwater harvesting to raise basic water services in health care facilities
29 May 2024

Han Heijnen visited Nepal in March 2024 to participate in the Regional Conference on Rainwater Harvesting and Management in Kathmandu and visit some field programme of IRHA’s partners. Upon his r...


Your support is key


Name: IRHA
Account: 17-198970-3
IBAN: CH15 0900 0000 1719 8970 3

Recognised as a public utility, your donations to the IRHA are tax deductible.



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