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 | 2016-07-01 → 2016-09-30 |
| MCL | Health-based | Resolved | 2016-07-01 → 2016-09-30 |
| MCL | Health-based | Resolved | 2016-04-01 → 2016-07-30 |
| MCL | Health-based | Resolved | 2016-04-01 → 2016-07-30 |
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2015-10-01 → 2015-12-31 |
| MCL | Health-based | Resolved | 2015-10-01 → 2015-12-31 |
| MCL | Health-based | Resolved | 2015-07-01 → 2015-09-30 |
| MCL | Health-based | Resolved | 2015-07-01 → 2015-09-30 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 11650 µg/L 117% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 13000 µg/L | 68/68 | SYR4 | 2012–2019 |
| Arsenic | 17.95 µg/L 180% of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 21 µg/L | 42/45 | SYR4 | 2012–2019 |
| Lead | 0.00070 mg/L 4.7% of the EPA limit 0.0150 mg/L | 14/14 | LCR | 2025 |
| Fluoride | 268 µg/L 6.7% of the EPA limit 4000 µg/L
worst single sample: 270 µg/L | 5/5 | SYR4 | 2014–2019 |
| Barium | 38.75 µg/L 1.9% of the EPA limit 2000 µg/L
worst single sample: 41 µg/L | 4/5 | SYR4 | 2014–2019 |
| Combined Uranium | 5.52045 µg/L 18% of the EPA limit 30 µg/L
worst single sample: 5.662 µg/L | 2/2 | SYR4 | 2014–2017 |
| Copper | 11 µg/L 0.8% of the EPA limit 1300 µg/L | 1/5 | SYR4 | 2014–2019 |
| Lead | 1.2 µg/L 8% of the EPA limit 15 µg/L | 1/5 | SYR4 | 2014–2019 |
| Toluene | 1.2 µg/L 0.1% of the EPA limit 1000 µg/L | 1/6 | SYR4 | 2012–2018 |
31 contaminants tested, none detected
Utility contact
Frequently asked questions about Fourth Street Water
Is Fourth Street Water tap water safe to drink?
EPA monitoring detected 9 contaminants in Fourth Street Water'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 Fourth Street Water's water?
EPA monitoring detected Nitrate, Arsenic, Lead, Fluoride, Barium, and others. The full list with the level and data source for each is above.
How many people does Fourth Street Water serve?
Fourth Street Water reports serving 56 people in California, per its EPA record.
Has Fourth Street Water had any water quality violations?
The EPA has 80 violations on file for Fourth Street Water, of which 70 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.