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 |
|---|---|---|---|
| MCL | Health-based | Archived | 1994-06-01 → 1994-06-30 |
| MCL | Health-based | Archived | 1994-06-01 → 1994-06-30 |
| MCL | Health-based | Archived | 1993-07-01 → 1993-07-31 |
| MCL | Health-based | Archived | 1993-07-01 → 1993-07-31 |
| MCL | Health-based | Archived | 1993-07-01 → 1993-07-31 |
| MR | Monitoring | Resolved | 2007-10-01 → 2007-12-31 |
| MR | Monitoring | Resolved | 2007-10-01 → 2007-12-31 |
| MR | Monitoring | Resolved | 2007-10-01 → 2007-12-31 |
| MR | Monitoring | Resolved | 2007-10-01 → 2007-10-31 |
| MR | Monitoring | Resolved | 2007-10-01 → 2007-10-31 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 69 µg/L 86% of the EPA limit 80 µg/L
worst single sample: 74 µg/L | 252/252 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 45 µg/L 75% of the EPA limit 60 µg/L
worst single sample: 52 µg/L | 252/252 | SYR4 | 2012–2019 |
| Bromodichloromethane | 18.4 µg/L No EPA limit set
worst single sample: 21.4 µg/L | 176/176 | SYR4 | 2013–2019 |
| Chloroform | 51 µg/L No EPA limit set
worst single sample: 60 µg/L | 176/176 | SYR4 | 2013–2019 |
| Dibromochloromethane | 5.525 µg/L No EPA limit set
worst single sample: 7.2 µg/L | 176/176 | SYR4 | 2013–2019 |
| Dichloroacetic Acid | 22.56 µg/L No EPA limit set
worst single sample: 26.6 µg/L | 175/175 | SYR4 | 2013–2019 |
| Trichloroacetic Acid | 20.68 µg/L No EPA limit set
worst single sample: 23 µg/L | 173/174 | SYR4 | 2013–2019 |
| Copper | 91.93 µg/L 7.1% of the EPA limit 1300 µg/L
worst single sample: 194 µg/L | 164/164 | SYR4 | 2013–2019 |
| Monochloroacetic Acid | 2.9 µg/L No EPA limit set
worst single sample: 3.6 µg/L | 153/175 | SYR4 | 2013–2019 |
| Lead | 3.0905 µg/L 21% of the EPA limit 15 µg/L
worst single sample: 16.6 µg/L | 150/164 | SYR4 | 2013–2019 |
| Dibromoacetic Acid | 1.7 µg/L No EPA limit set
worst single sample: 4 µg/L | 21/175 | SYR4 | 2013–2019 |
| Lead | 0.00060 mg/L 4% of the EPA limit 0.0150 mg/L | 19/19 | LCR | 2025 |
| Bromoform | 0.5000 µg/L No EPA limit set | 1/176 | SYR4 | 2013–2019 |
29 contaminants tested, none detected
Utility contact
Frequently asked questions about Arlington County
Is Arlington County tap water safe to drink?
EPA monitoring detected 15 contaminants in Arlington County'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 Arlington County's water?
EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.
How many people does Arlington County serve?
Arlington County reports serving 215,000 people in Virginia, per its EPA record.
Has Arlington County had any water quality violations?
The EPA has 12 violations on file for Arlington County, of which 5 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.