An educational resource on water and health, using an approach focused on health education and environmental health education, was developed to help teachers in the classroom. The implementation of health education programs in French primary schools is explained. Three specific objectives were identified, targeting 3rd, 4th, and 5th year pupils: water as a body constituent, water as a nutrient element, and water as a factor in hygiene, and their individual contribution to good health. The project was led by academics in close collaboration with education and health professionals (school nurses, public health engineers), and people working in health promotion organizations and environmental associations. The method used for the design and validation of the resource was adapted to the educational objective. The "Water and Health" educational resource is structured in 25 modules and includes 89 work files. It was validated in the classroom and includes an assessment of the teaching material and the pupils' results. The resource has been published in French by the Regional Teachers' Resource Centre (CRDP Auvergne, France) and is distributed by the National Teachers' Resource Network (Sceren).