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.”

Swimming has been illegal in most of D.C.'s waterways since the 1970s, largely because of contamination from the district's aging sewer system.

Kennedy Jr. shared photos of himself swimming alongside his grandchildren in Washington, D.C.'s Rock Creek, a waterway long known to be contaminated with high levels of bacteria. Newsweek reached out to HHS,