Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
| Violation | Type | Status | Period |
|---|---|---|---|
| TT | Health-based | Resolved | 2004-10-01 |
| TT | Health-based | Resolved | 2004-10-01 |
| MCL | Health-based | Resolved | 2004-09-01 → 2004-09-30 |
| TT | Health-based | Resolved | 2002-10-01 |
| TT | Health-based | Resolved | 2002-10-01 |
| TT | Health-based | Resolved | 2002-10-01 |
| TT | Health-based | Resolved | 2002-10-01 |
| TT | Health-based | Resolved | 2001-07-01 |
| TT | Health-based | Resolved | 2001-07-01 |
| TT | Health-based | Resolved | 2001-07-01 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Total Haloacetic Acids (HAA5) | 48.9 µg/L 82% of the EPA limit 60 µg/L | 109/109 | SYR4 | 2015–2017 |
| TTHM | 82 µg/L 102% of the EPA limit, in the worst sample — 80 µg/L | 107/107 | SYR4 | 2015–2017 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L | 59/59 | LCR | 2025 |
| Bromodichloromethane | 21.2 µg/L No EPA limit set | 4/4 | SYR4 | 2016 |
| Chloroform | 48.1 µg/L No EPA limit set | 4/4 | SYR4 | 2016 |
| Dibromochloromethane | 5.9 µg/L No EPA limit set | 4/4 | SYR4 | 2016 |
| Dibromoacetic Acid | 2.5 µg/L No EPA limit set | 1/1 | SYR4 | 2016 |
| Monobromoacetic Acid | 8.1 µg/L No EPA limit set | 1/1 | SYR4 | 2016 |
31 contaminants tested, none detected
Utility contact
Frequently asked questions about D.C. Water and Sewer Authority
Is D.C. Water and Sewer Authority tap water safe to drink?
EPA monitoring detected 10 contaminants in D.C. Water and Sewer Authority's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in D.C. Water and Sewer Authority's water?
EPA monitoring detected Total Haloacetic Acids (HAA5), TTHM, Lead, Bromodichloromethane, Chloroform, and others. The full list with the level and data source for each is above.
How many people does D.C. Water and Sewer Authority serve?
D.C. Water and Sewer Authority reports serving 632,323 people in DC, per its EPA record.
Has D.C. Water and Sewer Authority had any water quality violations?
The EPA has 82 violations on file for D.C. Water and Sewer Authority, of which 32 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.