District of Columbia
Water quality data from the EPA Safe Drinking Water Information System
Water Systems
48
Active public water systems
Population Served
700.5K
Residents with piped water
Lead Violations
2
Systems exceeding 15 ppb
Copper Violations
4
Lead & Copper Rule
Average Lead Level
EPA Action Level: 15 ppb
MCLG (health goal): 0 ppb
Average across 25 systems with reported lead data.
Violations Detected
6 water systems in District of Columbia have reported violations under the Lead and Copper Rule. These utilities are required to notify customers and take corrective action.
Water Systems: Highest Lead Levels
| System Name | City | Population | Lead Level | Status | Sample Date |
|---|---|---|---|---|---|
| WASHINGTON | 632,323 | 1.00 ppb | OK | 2025-06-30 | |
| WASHINGTON | 15,690 | 0.81 ppb | OK | 2023-12-31 | |
| WASHINGTON | 19,312 | 0.50 ppb | OK | 2024-12-31 | |
| JOINT BASE ANACOSTIA-BOLLING | 12,499 | 0.00 ppb | OK | 2017-12-31 |
Showing top 4 of 19 systems with lead data. Action level: 15 ppb.
Water Source Types
Air Quality
GoodAvg AQI
44.6
PM2.5
6.1 µg/m³
Unhealthy Days
5
Primary Pollutant
Ozone
Source: EPA AirNow & American Lung Association 2024 State of the Air. AQI scale: 0–50 Good · 51–100 Moderate · 101–150 Sensitive Groups · 151+ Unhealthy.
PFAS Contamination
High DetectionPFAS (per- and polyfluoroalkyl substances), known as “forever chemicals,” are a group of synthetic chemicals that persist indefinitely in the environment and human body. The EPA set a maximum contaminant level (MCL) of 4 parts per trillion (ppt) for PFOA and PFOS in April 2024. View national PFAS tracker →
Systems Tested
2
PFAS Detected
1
Detection Rate
50.0%
Exceeding MCL (4 ppt)
1(50.0%)
Highest recorded level: 6 ppt (EPA MCL: 4 ppt). Very few large public water systems; PFAS detected above threshold in at least one