What's in your area's water?
We publish the real contaminant data for each DC-metro water utility we serve, measured against EWG's health-based guidelines, not just the legal limit. Pick your area, or start with our plain-English contaminant guides.
We tested a real Arlington home. Total THMs dropped 95%.
Kitchen tap vs. the same water after Hydra, measured by an independent accredited lab. The tap came back over the health guideline — see every number.
Washington, DC tap water is treated by DC Water using the Washington Aqueduct's Potomac River source. It meets federal legal limits, but EWG testing flags several disinfection byproducts and other contaminants well above health-based guidelines.
View water report →Arlington County buys finished water from the Washington Aqueduct, so its contaminant profile mirrors DC's. Chlorination byproducts and hexavalent chromium are the contaminants that most exceed EWG health guidelines.
View water report →Alexandria's water (Virginia American Water) is drawn from the Potomac and shares the region's disinfection-byproduct profile, with PFAS and chromium-6 also detected above EWG health guidelines.
View water report →Fairfax Water treats Potomac River and Occoquan Reservoir water at its own plants. Several contaminants, led by hexavalent chromium and disinfection byproducts, exceed EWG health guidelines here.
View water report →Montgomery County (including Bethesda) is served by WSSC Water from the Potomac and Patuxent rivers. Its trihalomethane and haloacetic-acid averages sit hundreds of times above EWG's health-based guidelines.
View water report →Silver Spring is served by WSSC Water, drawing from the Potomac and Patuxent rivers. Chlorination byproducts (trihalomethanes and haloacetic acids) are the contaminants that most exceed EWG's health-based guidelines here.
View water report →Rockville's tap water comes from WSSC Water. While fully EPA-compliant, its disinfection-byproduct and hexavalent-chromium levels sit well above EWG's stricter health guidelines.
View water report →Reston is served by Fairfax Water from the Potomac River and Occoquan Reservoir. Hexavalent chromium and chlorination byproducts are the contaminants most above EWG's health guidelines.
View water report →McLean's water is treated by Fairfax Water. It meets federal limits, but EWG testing flags several contaminants, led by chromium-6 and disinfection byproducts, above health-based guidelines.
View water report →Vienna is served by Fairfax Water from the Potomac and Occoquan sources. Its supply carries hexavalent chromium and chlorination byproducts above EWG's stricter health guidelines.
View water report →Water reports for 48+ counties within 75 miles
We ship our systems nationwide, and offer free in-home installation and service across the wider DC, Maryland, Virginia, West Virginia and Pennsylvania region. Find your county for its local water profile, or look up any U.S. zip code above.