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 | 1998-05-01 → 1998-05-31 |
| MCL | Health-based | Resolved | 1998-05-01 → 1998-05-31 |
| MR | Monitoring | Addressed | 2024-10-01 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 9648 µg/L 96% of the EPA limit 10000 µg/L
worst single sample: 11000 µg/L | 186/186 | SYR4 | 2012–2019 |
| TTHM | 11.9 µg/L 15% of the EPA limit 80 µg/L
worst single sample: 28 µg/L | 55/72 | SYR4 | 2014–2019 |
| Chloroform | 1.8 µg/L No EPA limit set
worst single sample: 1.9 µg/L | 40/75 | SYR4 | 2014–2019 |
| Dibromochloromethane | 5.86 µg/L No EPA limit set
worst single sample: 11 µg/L | 38/81 | SYR4 | 2013–2019 |
| Bromoform | 5.34 µg/L No EPA limit set
worst single sample: 12 µg/L | 37/80 | SYR4 | 2013–2019 |
| Lead | 0.0015 mg/L 10% of the EPA limit 0.0150 mg/L | 28/28 | LCR | 2025 |
| Bromodichloromethane | 3 µg/L No EPA limit set
worst single sample: 3.1 µg/L | 26/81 | SYR4 | 2013–2019 |
| Dibromoacetic Acid | 3.37 µg/L No EPA limit set
worst single sample: 4 µg/L | 19/72 | SYR4 | 2014–2019 |
| Fluoride | 1020 µg/L 26% of the EPA limit 4000 µg/L
worst single sample: 1200 µg/L | 19/19 | SYR4 | 2012–2019 |
| Combined Uranium | 18.2972 µg/L 61% of the EPA limit 30 µg/L
worst single sample: 19.966 µg/L | 17/17 | SYR4 | 2013–2018 |
| Total Haloacetic Acids (HAA5) | 4.405 µg/L 7.3% of the EPA limit 60 µg/L
worst single sample: 4.6 µg/L | 14/72 | SYR4 | 2014–2019 |
| Chromium | 2.5 µg/L 2.5% of the EPA limit 100 µg/L
worst single sample: 3 µg/L | 11/23 | SYR4 | 2012–2019 |
| Barium | 59 µg/L 2.9% of the EPA limit 2000 µg/L
worst single sample: 65 µg/L | 9/19 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.82 µg/L No EPA limit set
worst single sample: 2 µg/L | 7/72 | SYR4 | 2014–2019 |
| Monochloroacetic Acid | 3.41 µg/L No EPA limit set
worst single sample: 3.5 µg/L | 4/72 | SYR4 | 2014–2019 |
| Lithium | 11 µg/L No EPA limit set | 3/6 | UCMR-5 | 2025 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0471 µg/L 24% of the EPA limit 0.2000 µg/L
worst single sample: 0.0490 µg/L | 2/14 | SYR4 | 2013–2018 |
| Arsenic | 3.26 µg/L 33% of the EPA limit 10 µg/L
worst single sample: 3.3 µg/L | 2/19 | SYR4 | 2012–2019 |
| Selenium | 5 µg/L 10% of the EPA limit 50 µg/L | 1/19 | SYR4 | 2012–2019 |
53 contaminants tested, none detected
Utility contact
Frequently asked questions about Riverside Highland Water Company
Is Riverside Highland Water Company tap water safe to drink?
EPA monitoring detected 28 contaminants in Riverside Highland Water Company'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 Riverside Highland Water Company's water?
EPA monitoring detected Nitrate, TTHM, Chloroform, Dibromochloromethane, Bromoform, and others. The full list with the level and data source for each is above.
How many people does Riverside Highland Water Company serve?
Riverside Highland Water Company reports serving 20,188 people in California, per its EPA record.
Has Riverside Highland Water Company had any water quality violations?
The EPA has 3 violations on file for Riverside Highland Water Company, of which 2 are health-based (a contaminant limit or required treatment was breached) and 1 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.