Sensitive to ecology since a young age, he was the first, with Bixente Lizarazu, to sponsor the Water Family in 2009. Mathieu feels directly concerned being a practitioner of water sports and a surfing enthusiast, he is one of the first witnesses of the degradation of the Ocean.

The Water Family, "Du Flocon à la Vague," is dedicated to preserving water, health, and biodiversity through scientific ecological education. Established in 2009, the association engages a diverse community including individuals, experts, and athletes. They develop educational programs for schools, the public, and organizations, promoting positive environmental practices. By educating young generations and fostering eco-responsibility, the Water Family drives impactful change. Join Mathieu Crépel and the Water Family in their mission to protect vital water resources and inspire sustainable living.