Water quality report for Hidden Lake Colony, MT — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.
A look at Hidden Lake Colony's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.
Lead was not detected and no violations are open. PFAS has never been sampled at this system.
Graded on violations and lead, with state inspection findings. PFAS not tested.
| Contaminant | Type | Measured | Limit | Period | Status |
|---|---|---|---|---|---|
| Consumer Confidence Rule | OTHER | — | — | 2025 | Unaddressed |
| Consumer Confidence Rule | OTHER | — | — | 2024 | Resolved |
| Revised Total Coliform Rule | MONITORING FAILURE | — | — | 2024 | Resolved |
| Revised Total Coliform Rule | MONITORING FAILURE | — | — | 2024 | Resolved |
| Revised Total Coliform Rule | MONITORING FAILURE | — | — | 2023 | Resolved |
| Arsenic | MONITORING AND REPORTING | — | 0.010 mg/L | 2023 | Resolved |
| Antimony, Total | MONITORING AND REPORTING | — | 0.006 mg/L | 2023 | Resolved |
| Revised Total Coliform Rule | MONITORING FAILURE | — | — | 2023 | Resolved |
| Antimony, Total | MONITORING AND REPORTING | — | 0.006 mg/L | 2022 | Resolved |
| E. COLI | MONITORING AND REPORTING | — | 0 | 2022 | Resolved |
| Revised Total Coliform Rule | MONITORING FAILURE | — | — | 2022 | Resolved |
| Revised Total Coliform Rule | MONITORING FAILURE | — | — | 2021 | Resolved |
| Consumer Confidence Rule | OTHER | — | — | 2020 | Resolved |
| Arsenic | MONITORING AND REPORTING | — | 0.010 mg/L | 2020 | Resolved |
| Antimony, Total | MONITORING AND REPORTING | — | 0.006 mg/L | 2020 | Resolved |
| Nitrate-Nitrite | MONITORING AND REPORTING | — | — | 2020 | Resolved |
| Combined Radium (-226 and -228) | MONITORING AND REPORTING | — | 5 pCi/L | 2019 | Resolved |
| Endrin | MONITORING AND REPORTING | — | 0.002 mg/L | 2019 | Resolved |
| BHC-GAMMA | MONITORING AND REPORTING | — | 0.0002 mg/L | 2019 | Resolved |
| Methoxychlor | MONITORING AND REPORTING | — | 0.04 mg/L | 2019 | Resolved |
| Toxaphene | MONITORING AND REPORTING | — | 0.003 mg/L | 2019 | Resolved |
| Dalapon | MONITORING AND REPORTING | — | 0.2 mg/L | 2019 | Resolved |
| Di(2-ethylhexyl) adipate | MONITORING AND REPORTING | — | 0.4 mg/L | 2019 | Resolved |
| OXAMYL | MONITORING AND REPORTING | — | 0.2 mg/L | 2019 | Resolved |
| Simazine | MONITORING AND REPORTING | — | 0.004 mg/L | 2019 | Resolved |
| Di(2-ethylhexyl) phthalate | MONITORING AND REPORTING | — | 0.006 mg/L | 2019 | Resolved |
| Picloram | MONITORING AND REPORTING | — | 0.5 mg/L | 2019 | Resolved |
| Dinoseb | MONITORING AND REPORTING | — | 0.007 mg/L | 2019 | Resolved |
| Hexachlorocyclopentadiene | MONITORING AND REPORTING | — | 0.05 mg/L | 2019 | Resolved |
| Carbofuran | MONITORING AND REPORTING | — | 0.04 mg/L | 2019 | Resolved |
| Atrazine | MONITORING AND REPORTING | — | 0.003 mg/L | 2019 | Resolved |
| LASSO | MONITORING AND REPORTING | — | — | 2019 | Resolved |
| Heptachlor | MONITORING AND REPORTING | — | 0.0004 mg/L | 2019 | Resolved |
| Heptachlor epoxide | MONITORING AND REPORTING | — | 0.0002 mg/L | 2019 | Resolved |
| 2,4-D | MONITORING AND REPORTING | — | 0.07 mg/L | 2019 | Resolved |
| 2,4,5-TP | MONITORING AND REPORTING | — | 0.05 mg/L | 2019 | Resolved |
| HEXACHLOROBENZENE | MONITORING AND REPORTING | — | 0.001 mg/L | 2019 | Resolved |
| Benzo(a)pyrene | MONITORING AND REPORTING | — | 0.0002 mg/L | 2019 | Resolved |
| Pentachlorophenol | MONITORING AND REPORTING | — | 0.001 mg/L | 2019 | Resolved |
| Chlordane | MONITORING AND REPORTING | — | 0.002 mg/L | 2019 | Resolved |
| Gross Alpha, Excl. Radon and U | MONITORING AND REPORTING | — | 15 pCi/L | 2019 | Resolved |
| Revised Total Coliform Rule | MONITORING FAILURE | — | — | 2017 | Resolved |
| Arsenic | MCL EXCEEDANCE | 0.587 MG/L | 0.010 mg/L | 2017 | Resolved |
| Nitrate-Nitrite | MCL EXCEEDANCE | 26.1 MG/L | — | 2017 | Resolved |
| Arsenic | MONITORING AND REPORTING | — | 0.010 mg/L | 2016 | Resolved |
| Groundwater Rule | MONITORING AND REPORTING | — | — | 2016 | Resolved |
| Groundwater Rule | MONITORING AND REPORTING | — | — | 2016 | Resolved |
| Groundwater Rule | MONITORING AND REPORTING | — | — | 2016 | Resolved |
| Groundwater Rule | MONITORING AND REPORTING | — | — | 2016 | Resolved |
| Groundwater Rule | MONITORING AND REPORTING | — | — | 2015 | Resolved |
| Groundwater Rule | MONITORING AND REPORTING | — | — | 2015 | Resolved |