County · Montana
Lewis and Clark County, Montana: drinking water records
This overview covers 11 ZIP codes and 51 community water systems in Lewis and Clark County. It also stands in for 2 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Helena Water System MT0000241 | 32,091 | 270 | 0 | 3 | 3 ppb |
| East Helena City of MT0000196 | 2,114 | 0 | 0 | 1 | 1 ppb |
| Ten Mile and Pleasant Valley Wua MT0002005 | 750 | 0 | 0 | 1 | 0 ppb |
| Skyview Water and Sewer Utility MT0004039 | 400 | 0 | 0 | 2 | 14 ppb |
| Holmberg Village Estates MT0004190 | 225 | 0 | 0 | 1 | 0 ppb |
| Glacier Point Ho and Wua MT0004559 | 210 | 0 | 0 | 1 | 0 ppb |
| Elk Creek Colony MT0004739 | 84 | 0 | 0 | 7 | 0 ppb |
| Mcdonald Trailer Ct MT0000402 | 75 | 0 | 0 | 1 | 0 ppb |
| Milford Colony INC MT0001646 | 67 | 0 | 0 | 5 | 0 ppb |
| Blue Cloud Subdivision MT0004288 | 60 | 0 | 0 | 4 | 3 ppb |
| Broadwater Estates HOA MT0004697 | 40 | 0 | 0 | 5 | 0 ppb |
| Bahny Brae Subdivision MT0003196 | 35 | 0 | 0 | 1 | 2 ppb |
| Eastgate Village Sewer and Water MT0001784 | 2,000 | 0 | 0 | 0 | 1 ppb |
| VA Medical Center Helena MT0000246 | 1,275 | 0 | 0 | 0 | 7 ppb |
| Helena Leisure LLC MT0000590 | 1,200 | 0 | 0 | 0 | 1 ppb |
| North Star PUD MT0004264 | 715 | 0 | 0 | 0 | 7 ppb |
| Treasure State Acres Wua MT0002390 | 483 | 0 | 0 | 0 | 2 ppb |
| La Casa Grande Water and Sewer District MT0001924 | 404 | 0 | 0 | 0 | 2 ppb |
| Golden Estates Homeowners Association MT0004187 | 400 | 0 | 0 | 0 | 5 ppb |
| Mobile City Home Park No 2 MT0003043 | 300 | 0 | 0 | 0 | 2 ppb |
| Ranchview Estates Wua MT0003782 | 250 | 0 | 0 | 0 | 0 ppb |
| Grass Land Estates MT0004448 | 228 | 0 | 0 | 0 | 2 ppb |
| Bridge Creek Estates Subdivision MT0004555 | 205 | 0 | 0 | 0 | 0 ppb |
| Pele Park MT0000593 | 186 | 0 | 0 | 0 | 0 ppb |
| Davis Meadow Village MT0003990 | 180 | 0 | 0 | 0 | 1 ppb |
ZIP reports in Lewis and Clark County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 59633, 59639.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.