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 | 2023-07-01 → 2023-09-30 |
| MCL | Health-based | Resolved | 2023-07-01 → 2023-09-30 |
| MCL | Health-based | Resolved | 2023-04-01 → 2023-06-30 |
| MCL | Health-based | Resolved | 2023-04-01 → 2023-06-30 |
| MCL | Health-based | Resolved | 2023-01-01 → 2023-03-31 |
| MCL | Health-based | Resolved | 2023-01-01 → 2023-03-31 |
| MCL | Health-based | Resolved | 2018-04-01 → 2018-06-30 |
| MCL | Health-based | Resolved | 2018-04-01 → 2018-06-30 |
| MCL | Health-based | Resolved | 2018-01-01 → 2018-03-31 |
| MCL | Health-based | Resolved | 2018-01-01 → 2018-03-31 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromodichloromethane | 22.7 µg/L No EPA limit set
worst single sample: 29 µg/L | 67/67 | SYR4 | 2012–2019 |
| Chloroform | 89.2 µg/L No EPA limit set
worst single sample: 103 µg/L | 67/67 | SYR4 | 2012–2019 |
| TTHM | 108.5 µg/L 136% of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 122 µg/L | 66/66 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 79.225 µg/L 132% of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 140 µg/L | 66/66 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 50.5 µg/L No EPA limit set
worst single sample: 97 µg/L | 66/66 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 33.92 µg/L No EPA limit set
worst single sample: 46 µg/L | 65/66 | SYR4 | 2012–2019 |
| Dibromochloromethane | 9.9 µg/L No EPA limit set
worst single sample: 14 µg/L | 43/67 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 37/37 | LCR | 2022 |
| Monochloroacetic Acid | 9.345 µg/L No EPA limit set
worst single sample: 12.1 µg/L | 20/66 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.84 µg/L No EPA limit set
worst single sample: 1.9 µg/L | 7/66 | SYR4 | 2012–2019 |
| Nitrate | 170 µg/L 1.7% of the EPA limit 10000 µg/L | 6/32 | SYR4 | 2012–2019 |
| Bromoform | 1.95 µg/L No EPA limit set
worst single sample: 2 µg/L | 2/67 | SYR4 | 2012–2019 |
| Beryllium, Total | 0.1400 µg/L 3.5% of the EPA limit 4 µg/L | 1/9 | SYR4 | 2012–2019 |
| Copper | 1.4 µg/L 0.1% of the EPA limit 1300 µg/L | 1/23 | SYR4 | 2012–2019 |
| Chromium | 13 µg/L 13% of the EPA limit 100 µg/L | 1/9 | SYR4 | 2012–2019 |
64 contaminants tested, none detected
Utility contact
Frequently asked questions about Calistoga, City of
Is Calistoga, City of tap water safe to drink?
EPA monitoring detected 19 contaminants in Calistoga, 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 Calistoga, City of's water?
EPA monitoring detected Bromodichloromethane, Chloroform, TTHM, Total Haloacetic Acids (HAA5), Trichloroacetic Acid, and others. The full list with the level and data source for each is above.
How many people does Calistoga, City of serve?
Calistoga, City of reports serving 5,610 people in California, per its EPA record.
Has Calistoga, City of had any water quality violations?
The EPA has 33 violations on file for Calistoga, City of, of which 30 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.