WSSC Water Lifts Recreational Water Contact Health Advisory  for Triadelphia Reservoir 

Laurel, Md. – October 31, 2023: WSSC Water today lifted the recreational water contact health advisory for the Triadelphia Reservoir, which was issued earlier this summer due to high levels of blue-green algae. The end of the health advisory follows two consecutive weeks of extensive monitoring and testing showing algal concentrations and potential toxins well below advisory thresholds.  

A recreational water contact health advisory for the T. Howard Duckett Reservoir was lifted earlier this month. Visitors can now safely resume recreational activities at both reservoirs.  

To learn about blue-green algae and algal blooms, visit WSSC Water’s Algal Blooms page.  

The Triadelphia and T. Howard Duckett reservoirs, located along the Patuxent River in Montgomery, Prince George’s & Howard counties, serve as drinking water sources for WSSC Water and as a recreational area for hiking, fishing and boating. It is important to note that WSSC Water’s drinking water was not affected and continues to meet all Safe Drinking Water Act standards.  

For up-to-date information on watershed activities, please call our hotline at (301) 206-4386 (4FUN). Permitting and regulation details can be found at www.wsscwater.com/watershed.