The European Partnership Water Security for the Planet (Water4All) is a co-funded partnership under Horizon Europe.

The fourth joint transnational call for research and innovation projects focuses on the general theme of ‘Water and Health’. The aim of the call is to address key challenges related to the link between water and human health, including water quality, contaminants, and water treatment technologies.

Research and innovation proposals submitted under the Water4All 2025 Joint Transnational Call are required to address at least one of the following topics:

• Topic 1: Waterborne contaminants and health risks: occurrence, behaviour, interactions and vulnerability.
• Topic 2: Innovative tools and technologies for water quality and exposure monitoring.
• Topic 3: Water treatment and exposure mitigation.
• Topic 4: Governance, socio-economic innovation, and policy integration for water and health.

The 2025 call structure includes an additional modality for Early Career Researchers, which focuses on developing capacities for talented early career researchers by giving them an opportunity to act as leaders of the project consortium. The principal criterion for the early career researcher acting as coordinator is to have obtained their PhD less than 10 years before the launch of the call.

To be eligible, each consortium must be composed of at least three eligible partners that request funding from participating funding partner organisations from three different countries participating in the call. Projects must involve at least two independent legal entities from two different EU Member States or Horizon Europe associated countries as recipients of the financial support. The upper limit of eligible project partners per consortium is seven (including one self-funded partner).

A global budget of approximately €36.6 million has been reserved for the call. The following countries have agreed to participate:

Austria, Belgium, Brazil, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Moldova, the Netherlands, Norway, Poland, Portugal, Romania, Slovak Republic, South Africa, Spain, Switzerland, Tunisia, Türkiye, and the United Kingdom.

The call follows a two-step application procedure, with a closing date for mandatory pre-proposals of 13 November 2025 (15:00 CET).