Potomac sites that are under DC jurisdiction are rated against these values. Samples over the standard are considered "red" due to their failure to meet criteria, and the increased risk of illness. Samples are rated “green” if they fall below these values. After 5 consecutive weeks, the geometric mean will be calculated and compared to the 126 MPN value to determine a pass or fail status. coli single sample value = 410 MPN/100mLįor the first 5 consecutive weeks, single sample values will be compared against the single sample standard of 410 MPN. These Primary Contact Water Quality Standards are as follows: coli at the time of sampling falls beneath the Virginia Department of Environmental Quality primary contact water quality safety standards as well as the DC and MD Primary Contact Water Quality Standards These data can be viewed through the Chesapeake Monitoring Collaborative Data Explorer, Ī “green” rating demonstrates that the level of E. We encourage users to explore the sample data in addition to checking the swim guide status. Water quality standards as well as the methods used to determine pass or fail status vary widely across jurisdictions and monitoring programs. The activation of the Clean Rivers Project in DC is expected to reduce system wide combined sewage overflow by 96%, bringing the Potomac significantly closer to a swimmable river. WATERS REGARDLESS OF THE CURRENT STATUS**ĭespite its designation as a Class A Primary Contact waterway, the DC Department of Health (DOH) bans swimming in the Potomac River citing the risk of high bacteria levels after rainstorms as the only reason it is considered “unsafe” to swim. ![]() ![]() **WARNING: SWIMMING IS PROHIBITED IN D.C. The Tidal Basin loop trail circles around the water and is a great way to see both nature and culture. Take a paddleboat out for a great view of the Washington monument, the Jefferson Memorial, and the Martin Luther King Jr. Located in West Potomac Park, the Tidal Basin is well known for the famous Washington Cherry Blossom Festival that takes place each spring.
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