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 |
| MR | Monitoring | Resolved | 2019-10-01 |
| MR | Monitoring | Resolved | 1993-06-30 → 2000-04-04 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 14300 µg/L 143% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 17600 µg/L | 546/592 | SYR4 | 2012–2019 |
| Lead | 0.0011 mg/L 7.3% of the EPA limit 0.0150 mg/L | 47/47 | LCR | 2026 |
| Fluoride | 213.5 µg/L 5.3% of the EPA limit 4000 µg/L
worst single sample: 220 µg/L | 14/30 | SYR4 | 2012–2019 |
| Barium | 185 µg/L 9.3% of the EPA limit 2000 µg/L
worst single sample: 190 µg/L | 11/19 | SYR4 | 2013–2019 |
| Bromoform | 5.66 µg/L No EPA limit set
worst single sample: 5.8 µg/L | 8/8 | SYR4 | 2013–2019 |
| TTHM | 7.6 µg/L 9.5% of the EPA limit 80 µg/L | 8/8 | SYR4 | 2013–2019 |
| Dibromoacetic Acid | 1.77 µg/L No EPA limit set
worst single sample: 1.8 µg/L | 7/8 | SYR4 | 2013–2019 |
| Total Haloacetic Acids (HAA5) | 1.77 µg/L 3% of the EPA limit 60 µg/L
worst single sample: 1.8 µg/L | 7/8 | SYR4 | 2013–2019 |
| Dibromochloromethane | 2.475 µg/L No EPA limit set
worst single sample: 2.5 µg/L | 6/8 | SYR4 | 2013–2019 |
| Nitrate-Nitrite | 521250 µg/L 5213% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 539000 µg/L | 6/9 | SYR4 | 2013–2017 |
| Copper | 41 µg/L 3.2% of the EPA limit 1300 µg/L
worst single sample: 44 µg/L | 5/23 | SYR4 | 2012–2019 |
| Lithium | 16.1 µg/L No EPA limit set | 5/14 | UCMR-5 | 2024 |
| Chromium | 33.31 µg/L 33% of the EPA limit 100 µg/L
worst single sample: 36 µg/L | 3/19 | SYR4 | 2013–2019 |
| Lead | 6.4 µg/L 43% of the EPA limit 15 µg/L | 1/17 | SYR4 | 2013–2019 |
70 contaminants tested, none detected
Utility contact
Frequently asked questions about Los Osos Community Services District
Is Los Osos Community Services District tap water safe to drink?
EPA monitoring detected 22 contaminants in Los Osos Community Services District'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 Los Osos Community Services District's water?
EPA monitoring detected Nitrate, Lead, Fluoride, Barium, Bromoform, and others. The full list with the level and data source for each is above.
How many people does Los Osos Community Services District serve?
Los Osos Community Services District reports serving 7,086 people in California, per its EPA record.
Has Los Osos Community Services District had any water quality violations?
The EPA has 3 violations on file for Los Osos Community Services District, 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.