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 | Resolved | 2023-06-01 → 2023-06-30 |
| MCL | Health-based | Resolved | 2023-06-01 → 2023-06-30 |
| MCL | Health-based | Resolved | 2013-09-01 → 2013-09-30 |
| MCL | Health-based | Archived | 2006-09-01 → 2006-09-30 |
| MCL | Health-based | Archived | 2005-04-01 → 2005-04-30 |
| MCL | Health-based | Archived | 2005-03-01 → 2005-03-31 |
| Other | Monitoring | Resolved | 2012-07-01 |
| MR | Monitoring | Resolved | 2003-01-01 |
| MR | Monitoring | Resolved | 2003-01-01 |
| MR | Monitoring | Resolved | 2003-01-01 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Lead | 0.0012 mg/L 8% of the EPA limit 0.0150 mg/L | 12/12 | LCR | 2024 |
| Chloroform | 4.1 µg/L No EPA limit set
worst single sample: 4.2 µg/L | 5/12 | SYR4 | 2012–2019 |
| TTHM | 10.96 µg/L 14% of the EPA limit 80 µg/L
worst single sample: 11 µg/L | 5/5 | SYR4 | 2014–2016 |
| Bromodichloromethane | 3.885 µg/L No EPA limit set
worst single sample: 3.9 µg/L | 4/12 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 3.1 µg/L 5.2% of the EPA limit 60 µg/L
worst single sample: 3.4 µg/L | 4/6 | SYR4 | 2014–2016 |
| Dibromochloromethane | 3.18 µg/L No EPA limit set
worst single sample: 3.2 µg/L | 3/12 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 1.75 µg/L No EPA limit set
worst single sample: 1.8 µg/L | 3/6 | SYR4 | 2014–2016 |
| Trichloroacetic Acid | 1.59 µg/L No EPA limit set
worst single sample: 1.6 µg/L | 2/6 | SYR4 | 2014–2016 |
| Arsenic | 1.3 µg/L 13% of the EPA limit 10 µg/L | 1/4 | SYR4 | 2018–2019 |
| Lead | 1.3 µg/L 8.7% of the EPA limit 15 µg/L | 1/4 | SYR4 | 2018–2019 |
94 contaminants tested, none detected
Utility contact
Frequently asked questions about King County Water District #54
Is King County Water District #54 tap water safe to drink?
EPA monitoring detected 10 contaminants in King County Water District #54'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 King County Water District #54's water?
EPA monitoring detected Lead, Chloroform, TTHM, Bromodichloromethane, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does King County Water District #54 serve?
King County Water District #54 reports serving 5,373 people in Washington, per its EPA record.
Has King County Water District #54 had any water quality violations?
The EPA has 19 violations on file for King County Water District #54, of which 6 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.