Robert F. Kennedy Jr. Swam with his grandchildren in Rock Creek, a waterway in Washington, D.C., known to be contaminated with sewage and high levels of bacteria.
RFK jr swam in a contaminated lake

RFK Jr. Swam with Grandkids on Mother's Day in DC Creek With 'High Bacteria Levels' - Newsweek
Source: newsweek.com
Key Evidence
The Guardian reported RFK Jr. Swam in Rock Creek, which officials say is toxic due to bacteria and pathogens.
theguardian.comtheguardian.comRFK Jr and his grandchildren swam in DC creek contaminated by sewage
Snopes confirmed the creek was sewage-contaminated and that RFK Jr. Swam there with his grandchildren.
snopes.comsnopes.comYes, RFK Jr. took grandkids swimming in sewage-contaminated creek on Mother's...
The National Park Service bans swimming in Rock Creek because of high bacteria levels.
vanityfair.comvanityfair.comRFK Jr. Took His Grandkids for a Dip in a Sewage-Contaminated Creek For Mother’s...
RFK Jr. Posted photos of the swim publicly despite the known contamination.
nytimes.comnytimes.comRFK Jr. Swims in D.C.’s Rock Creek, Which Flows With Sewage and Bacteria
What the Evidence Shows
Multiple reputable news sources confirm that on Mother's Day 2025, Robert F. Kennedy Jr., the U.S. Secretary of Health and Human Services, took a swim with his grandchildren in Rock Creek, a creek in Washington, D.C. This creek is widely reported to be contaminated with sewage and has high bacteria levels, making swimming there unsafe and officially discouraged by authorities such as the National Park Service. The creek is known for raw sewage runoff and infectious pathogens, and swimming or wading in it is banned due to health risks. Kennedy himself acknowledged the contamination but chose to swim there nonetheless.
Key points:
Rock Creek is contaminated with sewage and bacteria, confirmed by environmental and health officials.
The National Park Service explicitly bans swimming in Rock Creek due to these contamination concerns.
RFK Jr. Publicly shared photos of himself swimming with his grandchildren in this creek on Mother's Day 2025.
Multiple independent media outlets including The Guardian, Snopes, Newsweek, NBC News, The New York Times, MSNBC, and Vanity Fair have reported on this incident consistently.
This evidence establishes that the claim that RFK Jr. Swam in a contaminated lake (creek) is accurate.