Health and Human Services Secretary Robert F. Kennedy Jr. posted photos Sunday of him and his family swimming in Rock Creek where swimming is not allowed “due to high bacteria levels.”

Health and Human Services Secretary Robert F. Kennedy Jr. shared pictures of himself and his family swimming in Rock Creek in Washington, D.C., despite decadeslong warnings from the National Park Service not to do so.

Robert F. Kennedy Jr., the nation’s health czar, is shown bathing in Rock Creek, a D.C. stream that was flagged as polluted, on an outing with his grandchildren.