PFAS Testing Results
District of Columbia
PFAS testing results for 3 water systems serving 667,325 residents.
No water systems in District of Columbia exceeded federal PFAS limits in EPA testing.
Systems tested
3
100.0% had PFAS detections
Limits exceeded
0
0.0% of systems
Population affected
0
served by systems over federal limits
Most common compound
11Cl-PF3OUdS
detected in 3 systems
Grade distribution
Every water system gets a letter grade based on how its worst detected PFAS compound compares to the federal Maximum Contaminant Level. Lower grades mean higher contamination.
What District of Columbia is doing about PFAS
The District of Columbia does not set its own drinking water MCLs for PFAS. DC Water and the DC Department of Energy and Environment rely on the federal EPA limits finalized in April 2024, which set enforceable limits of 4 parts per trillion for PFOA and PFOS and 10 parts per trillion for PFHxS, PFNA, and HFPO-DA.
Public records show DC Water sampled for PFAS under UCMR 5 and has reported results through annual Consumer Confidence Reports. The district is subject to the federal compliance timeline requiring initial monitoring by 2027 and treatment installation by 2029.
Based on DC Water and DC Department of Energy and Environment publications.
All 3 tested water systems in District of Columbia
Sorted from lowest grade to highest. Click any system name for the full report. Filter by city or name with the search box below.
Showing 3 of 3 systems
| Grade | System name | City | Worst compound | vs. EPA limit | Population |
|---|---|---|---|---|---|
B | D.C. WATER AND SEWER AUTHORITY | WASHINGTON | PFPeA | Below detection | 632K |
B | NAVAL STATION WASHINGTON - WNY | WASHINGTON | PFPeA | Below detection | 16K |
B | JOINT BASE ANACOSTIA - BOLLING | WASHINGTON | PFPeA | Below detection | 19K |
Check your water system
Enter your zip code to see the PFAS results for the water system that serves your home.
Where this data comes from
- EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5)
- Testing period: 2023 to 2026
- Federal limits: EPA Maximum Contaminant Levels finalized April 2024
- Read the full methodology