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 |
|---|---|---|---|
| Other | Monitoring | Resolved | 2023-07-01 |
| Other | Monitoring | Resolved | 2023-07-01 |
| MR | Monitoring | Resolved | 2021-10-01 |
| MR | Monitoring | Resolved | 2021-10-01 |
| MR | Monitoring | Resolved | 2021-10-01 |
| MR | Monitoring | Resolved | 2019-07-01 → 2019-09-30 |
| MR | Monitoring | Resolved | 2019-07-01 → 2019-09-30 |
| MR | Monitoring | Resolved | 2019-07-01 → 2019-09-30 |
| MR | Monitoring | Resolved | 2019-07-01 → 2019-09-30 |
| MR | Monitoring | Resolved | 2019-07-01 → 2019-09-30 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Copper | 69.95 µg/L 5.4% of the EPA limit 1300 µg/L
worst single sample: 74 µg/L | 10/10 | SYR4 | 2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 6/6 | LCR | 2027 |
| Lead | 1.9 µg/L 13% of the EPA limit 15 µg/L
worst single sample: 2 µg/L | 3/10 | SYR4 | 2019 |
| Combined Uranium | 13.69 µg/L 46% of the EPA limit 30 µg/L
worst single sample: 13.7 µg/L | 2/2 | SYR4 | 2019 |
| Nitrate-Nitrite | 4970 µg/L 50% of the EPA limit 10000 µg/L | 2/2 | SYR4 | 2019 |
| Lithium | 85 µg/L No EPA limit set | 2/2 | UCMR-5 | 2024 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L | 1/1 | SYR4 | 2019 |
| Bromodichloromethane | 4.8 µg/L No EPA limit set | 1/2 | SYR4 | 2019 |
| Bromoform | 0.8000 µg/L No EPA limit set | 1/2 | SYR4 | 2019 |
| Chloroform | 2.8 µg/L No EPA limit set | 1/2 | SYR4 | 2019 |
| Dibromoacetic Acid | 1.8 µg/L No EPA limit set | 1/1 | SYR4 | 2019 |
| Dibromochloromethane | 4.5 µg/L No EPA limit set | 1/2 | SYR4 | 2019 |
| Dichloroacetic Acid | 1.8 µg/L No EPA limit set | 1/1 | SYR4 | 2019 |
| Fluoride | 600 µg/L 15% of the EPA limit 4000 µg/L | 1/1 | SYR4 | 2019 |
| Gross Alpha, Excl. Radon And U | 4.3 pCi/L 29% of the EPA limit 15 pCi/L | 1/2 | SYR4 | 2019 |
| Selenium | 2 µg/L 4% of the EPA limit 50 µg/L | 1/1 | SYR4 | 2019 |
| TTHM | 13 µg/L 16% of the EPA limit 80 µg/L | 1/2 | SYR4 | 2019 |
| Total Haloacetic Acids (HAA5) | 5.5 µg/L 9.2% of the EPA limit 60 µg/L | 1/1 | SYR4 | 2019 |
| Trichloroacetic Acid | 1.9 µg/L No EPA limit set | 1/1 | SYR4 | 2019 |
83 contaminants tested, none detected
Utility contact
Frequently asked questions about Black Rock Estates Subdivision
Is Black Rock Estates Subdivision tap water safe to drink?
EPA monitoring detected 19 contaminants in Black Rock Estates Subdivision'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 Black Rock Estates Subdivision's water?
EPA monitoring detected Copper, Lead, Lead, Combined Uranium, Nitrate-Nitrite, and others. The full list with the level and data source for each is above.
How many people does Black Rock Estates Subdivision serve?
Black Rock Estates Subdivision reports serving 75 people in Montana, per its EPA record.
Has Black Rock Estates Subdivision had any water quality violations?
The EPA has 80 violations on file for Black Rock Estates Subdivision, 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.