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 | 2009-11-01 → 2009-11-30 |
| MCL | Health-based | Resolved | 2009-11-01 → 2009-11-30 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 11000 µg/L 110% of the EPA limit, in the worst sample — 10000 µg/L | 1810/1810 | SYR4 | 2012–2019 |
| TTHM | 14 µg/L 18% of the EPA limit 80 µg/L | 89/95 | SYR4 | 2014–2019 |
| Dibromochloromethane | 4.9 µg/L No EPA limit set | 87/95 | SYR4 | 2014–2019 |
| Bromoform | 8 µg/L No EPA limit set | 85/95 | SYR4 | 2014–2019 |
| Dibromoacetic Acid | 2.6 µg/L No EPA limit set | 72/92 | SYR4 | 2014–2019 |
| Bromodichloromethane | 2.7 µg/L No EPA limit set | 59/95 | SYR4 | 2014–2019 |
| Total Haloacetic Acids (HAA5) | 8.9 µg/L 15% of the EPA limit 60 µg/L | 49/92 | SYR4 | 2014–2019 |
| Fluoride | 640 µg/L 16% of the EPA limit 4000 µg/L | 34/34 | SYR4 | 2013–2017 |
| Arsenic | 7.2 µg/L 72% of the EPA limit 10 µg/L | 31/34 | SYR4 | 2013–2019 |
| Lead | 0.0016 mg/L 11% of the EPA limit 0.0150 mg/L | 29/29 | LCR | 2025 |
| Combined Uranium | 25.33 µg/L 84% of the EPA limit 30 µg/L | 23/24 | SYR4 | 2014–2018 |
| Nitrate-Nitrite | 9500 µg/L 95% of the EPA limit 10000 µg/L | 22/22 | SYR4 | 2017 |
| Monobromoacetic Acid | 1.5 µg/L No EPA limit set | 10/92 | SYR4 | 2014–2019 |
| Monochloroacetic Acid | 5.9 µg/L No EPA limit set | 9/92 | SYR4 | 2014–2019 |
| Barium | 140 µg/L 7% of the EPA limit 2000 µg/L | 4/34 | SYR4 | 2013–2019 |
| Lithium | 21.9 µg/L No EPA limit set | 4/8 | UCMR-5 | 2023 |
| Trichloroacetic Acid | 1.8 µg/L No EPA limit set | 3/92 | SYR4 | 2014–2019 |
| Chloroform | 1.2 µg/L No EPA limit set | 2/95 | SYR4 | 2014–2019 |
| Dichloroacetic Acid | 1 µg/L No EPA limit set | 2/92 | SYR4 | 2014–2019 |
59 contaminants tested, none detected
Utility contact
Frequently asked questions about Golden State Water Co - Barstow
Is Golden State Water Co - Barstow tap water safe to drink?
EPA monitoring detected 23 contaminants in Golden State Water Co - Barstow'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 Golden State Water Co - Barstow's water?
EPA monitoring detected Nitrate, TTHM, Dibromochloromethane, Bromoform, Dibromoacetic Acid, and others. The full list with the level and data source for each is above.
How many people does Golden State Water Co - Barstow serve?
Golden State Water Co - Barstow reports serving 32,547 people in California, per its EPA record.
Has Golden State Water Co - Barstow had any water quality violations?
The EPA has 2 violations on file for Golden State Water Co - Barstow, of which 2 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.