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 |
|---|---|---|---|
| MR | Monitoring | Resolved | 2019-10-01 |
| Other | Monitoring | Archived | 1988-10-01 → 1988-10-31 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Lead | 0.00088 mg/L 5.9% of the EPA limit 0.0150 mg/L | 24/24 | LCR | 2026 |
| Chloroform | 19.74 µg/L No EPA limit set
worst single sample: 20.7 µg/L | 4/4 | SYR4 | 2012–2015 |
| TTHM | 21.565 µg/L 27% of the EPA limit 80 µg/L
worst single sample: 22.6 µg/L | 4/4 | SYR4 | 2012–2015 |
| Bromodichloromethane | 1.85 µg/L No EPA limit set
worst single sample: 1.9 µg/L | 3/4 | SYR4 | 2012–2015 |
| Total Haloacetic Acids (HAA5) | 9.39 µg/L 16% of the EPA limit 60 µg/L
worst single sample: 9.8 µg/L | 2/2 | SYR4 | 2014 |
| Trichloroacetic Acid | 4.07 µg/L No EPA limit set
worst single sample: 4.2 µg/L | 2/2 | SYR4 | 2014 |
| Dichloroacetic Acid | 5.6 µg/L No EPA limit set | 1/2 | SYR4 | 2014 |
| Selenium | 7.4 µg/L 15% of the EPA limit 50 µg/L | 1/5 | SYR4 | 2013–2019 |
102 contaminants tested, none detected
Utility contact
Frequently asked questions about City of Grass Valley
Is City of Grass Valley tap water safe to drink?
EPA monitoring detected 8 contaminants in City of Grass Valley'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 City of Grass Valley'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 City of Grass Valley serve?
City of Grass Valley reports serving 4,947 people in California, per its EPA record.
Has City of Grass Valley had any water quality violations?
The EPA has 2 violations on file for City of Grass Valley, of which 0 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.