MOUNTAIN HERITAGE WATER SYSTEM
PWS ID: MT0002873 · HELENA, Montana 59602
Population Served
175
Total Violations
103
Health-Based Violations
6
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 76
- County
- Lewis and Clark
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 94
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 18 | 2019 |
| TTHM | MR | 17 | 2006 |
| Total Haloacetic Acids (HAA5) | MR | 17 | 2006 |
| Coliform (TCR) | MCL | 6 | 2000 |
| Coliform (TCR) | MR | 4 | 1994 |
| Barium | MR | 4 | 2020 |
| Cadmium | MR | 4 | 2020 |
| Chromium | MR | 4 | 2020 |
| Fluoride | MR | 4 | 2020 |
| Mercury | MR | 4 | 2020 |
| Selenium | MR | 4 | 2020 |
| Nickel | MR | 3 | 2020 |
| Antimony, Total | MR | 3 | 2020 |
| Beryllium, Total | MR | 3 | 2020 |
| Thallium, Total | MR | 3 | 2020 |
| Arsenic | MR | 1 | 1982 |
| Nitrate | MR | 1 | 1982 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.