District of Columbia Drinking Water Compliance Records
4 water systems serving 668,435 people. 2 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
4
100%
B
0
0%
C
0
0%
D
0
0%
F
0
0%
4
Water Systems
668,435
Population Served
2
Historical Records
0
Health-Based (All Years)
Systems With the Most Recent EPA Records
NAVAL STATION WASHINGTON - WNY
16,800 served0 historical records
A
JOINT BASE ANACOSTIA - BOLLING
19,312 served1 historical record
A
D.C. WATER AND SEWER AUTHORITY
632,323 served0 historical records
A
WASHINGTON AQUEDUCT DIVISION.
0 served1 historical record
A
Large Systems With No Recent Records
D.C. WATER AND SEWER AUTHORITY
632,323 served0 historical records
A
JOINT BASE ANACOSTIA - BOLLING
19,312 served1 historical record
A
NAVAL STATION WASHINGTON - WNY
16,800 served0 historical records
A
Largest Water Systems in District of Columbia
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| D.C. WATER AND SEWER AUTHORITY | A | 632,323 | 0 |
| JOINT BASE ANACOSTIA - BOLLING | A | 19,312 | 1 |
| NAVAL STATION WASHINGTON - WNY | A | 16,800 | 0 |
| WASHINGTON AQUEDUCT DIVISION. | A | 0 | 1 |
Contaminants in District of Columbia
Lead in District of ColumbiaArsenic in District of ColumbiaNitrate in District of ColumbiaFluoride in District of ColumbiaPFOS in District of ColumbiaPFOA in District of ColumbiaTHMs in District of ColumbiaHAA5 in District of Columbia
Cities in District of Columbia
WASHINGTON(3)WASHINGTON NAVY YARD(1)