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 | 1996-02-01 → 1996-02-29 |
| MCL | Health-based | Resolved | 1996-02-01 → 1996-02-29 |
| MR | Monitoring | Unaddressed | 2022-10-01 |
| Other | Monitoring | Archived | 1986-05-01 → 1986-05-31 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 30.81 µg/L 39% of the EPA limit 80 µg/L
worst single sample: 39.3 µg/L | 111/136 | SYR4 | 2012–2019 |
| Bromodichloromethane | 8.1775 µg/L No EPA limit set
worst single sample: 8.9 µg/L | 106/136 | SYR4 | 2012–2019 |
| Chloroform | 21.85 µg/L No EPA limit set
worst single sample: 32.11 µg/L | 104/136 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 24.01 µg/L 40% of the EPA limit 60 µg/L
worst single sample: 33.9 µg/L | 99/133 | SYR4 | 2012–2019 |
| Dibromochloromethane | 3.7585 µg/L No EPA limit set
worst single sample: 4.4 µg/L | 88/136 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 11.965 µg/L No EPA limit set
worst single sample: 17.1 µg/L | 88/133 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 11.94 µg/L No EPA limit set
worst single sample: 16.8 µg/L | 87/133 | SYR4 | 2012–2019 |
| Nitrate | 2735 µg/L 27% of the EPA limit 10000 µg/L
worst single sample: 2938 µg/L | 74/86 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 22/22 | LCR | 2026 |
| Dibromoacetic Acid | 2.105 µg/L No EPA limit set
worst single sample: 2.2 µg/L | 20/133 | SYR4 | 2012–2019 |
| Fluoride | 161 µg/L 4% of the EPA limit 4000 µg/L
worst single sample: 170 µg/L | 10/23 | SYR4 | 2012–2019 |
| Barium | 110 µg/L 5.5% of the EPA limit 2000 µg/L | 5/23 | SYR4 | 2012–2019 |
| Bromoform | 2.5995 µg/L No EPA limit set
worst single sample: 2.61 µg/L | 4/136 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 2681 µg/L 27% of the EPA limit 10000 µg/L
worst single sample: 2800 µg/L | 2/5 | SYR4 | 2014–2016 |
| Asbestos | 0.2000 MFL 2.9% of the EPA limit 7 MFL | 1/7 | SYR4 | 2013–2019 |
| Monobromoacetic Acid | 1.8 µg/L No EPA limit set | 1/133 | SYR4 | 2012–2019 |
88 contaminants tested, none detected
Utility contact
Frequently asked questions about Ukiah, City of
Is Ukiah, City of tap water safe to drink?
EPA monitoring detected 25 contaminants in Ukiah, City of'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 Ukiah, City of's water?
EPA monitoring detected TTHM, Bromodichloromethane, Chloroform, Total Haloacetic Acids (HAA5), Dibromochloromethane, and others. The full list with the level and data source for each is above.
How many people does Ukiah, City of serve?
Ukiah, City of reports serving 16,607 people in California, per its EPA record.
Has Ukiah, City of had any water quality violations?
The EPA has 4 violations on file for Ukiah, City of, of which 2 are health-based (a contaminant limit or required treatment was breached) and 1 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.