Results from entry points (water leaving treatment, not household taps) of public water systems sampled under EPA's Fifth Unregulated Contaminant Monitoring Rule. Click a county to see every water system serving it, or turn on service areas and click a location to see the systems that serve that spot.
3 of the 5 public water systems listed for District of Columbia were sampled. Sorted by the highest single result relative to EPA's 2024 limits. Each name links to a page with all of that system's results. All 5 District of Columbia systems, including those not tested · Download all District of Columbia results (CSV, gzip)
| System | PWSID | City | Population | PFOA (ppt) | PFOS (ppt) | HI | Highest single result |
|---|---|---|---|---|---|---|---|
| D.C. Water And Sewer Authority | DC0000002 | Washington | 632,323 | <MRL | <MRL | 0 | Other PFAS detected |
| Joint Base Anacostia - Bolling | DC0000004 | Washington | 20,411 | <MRL | <MRL | 0 | Other PFAS detected |
| Naval Station Washington - Wny | DC0000003 | Washington Navy Yard | 16,800 | <MRL | <MRL | 0 | Other PFAS detected |
Highest single result for each system; PFOA and PFOS in ppt (ng/L). Entry-point samples, not tap water; screening comparisons, not compliance determinations.