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 |
|---|---|---|---|
| TT | Health-based | Unaddressed | 2024-10-17 |
| TT | Health-based | Resolved | 2018-01-01 |
| TT | Health-based | Resolved | 2018-01-01 |
| MCL | Health-based | Resolved | 2010-10-01 → 2010-10-31 |
| MCL | Health-based | Resolved | 2010-10-01 → 2010-10-31 |
| MCL | Health-based | Resolved | 1995-06-01 → 1995-06-30 |
| MCL | Health-based | Resolved | 1995-06-01 → 1995-06-30 |
| MR | Monitoring | Addressed | 2025-10-01 |
| MR | Monitoring | Unaddressed | 2025-01-01 |
| RPT | Monitoring | Unaddressed | 2024-10-17 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 4150 µg/L 42% of the EPA limit 10000 µg/L
worst single sample: 5500 µg/L | 30/30 | SYR4 | 2012–2019 |
| Lead | 0.0050 mg/L 33% of the EPA limit 0.0150 mg/L | 13/13 | LCR | 2024 |
| Arsenic | 9.18 µg/L 92% of the EPA limit 10 µg/L
worst single sample: 9.3 µg/L | 3/3 | SYR4 | 2014–2018 |
| Barium | 86.55 µg/L 4.3% of the EPA limit 2000 µg/L
worst single sample: 87 µg/L | 2/2 | SYR4 | 2014–2017 |
| Fluoride | 644 µg/L 16% of the EPA limit 4000 µg/L
worst single sample: 650 µg/L | 2/2 | SYR4 | 2014–2017 |
33 contaminants tested, none detected
Utility contact
Frequently asked questions about Clark Street Community Well
Is Clark Street Community Well tap water safe to drink?
EPA monitoring detected 5 contaminants in Clark Street Community Well'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 Clark Street Community Well's water?
EPA monitoring detected Nitrate, Lead, Arsenic, Barium, Fluoride. The full list with the level and data source for each is above.
How many people does Clark Street Community Well serve?
Clark Street Community Well reports serving 90 people in California, per its EPA record.
Has Clark Street Community Well had any water quality violations?
The EPA has 47 violations on file for Clark Street Community Well, of which 7 are health-based (a contaminant limit or required treatment was breached) and 8 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.