County · Montana
Flathead County, Montana: drinking water records
This overview covers 14 ZIP codes and 136 community water systems in Flathead 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 |
|---|---|---|---|---|---|
| Kalispell Public Works MT0000259 | 25,000 | 480 | 2 | 0 | 2 ppb |
| Whitefish City of MT0000357 | 10,418 | 120 | 0 | 0 | 2 ppb |
| Flathead County Water and Sewer MT0001744 | 7,775 | 240 | 0 | 0 | 1 ppb |
| Bigfork County Water and Sewer MT0000262 | 6,100 | 120 | 0 | 0 | 1 ppb |
| Columbia Falls City of MT0000181 | 4,450 | 60 | 0 | 0 | 4 ppb |
| Hilltop Terrace Subdivision MT0001922 | 230 | 0 | 0 | 1 | 7 ppb |
| Alpine Village Wua MT0003229 | 125 | 60 | 1 | 0 | 66 ppb |
| Wettington Water District INC MT0004083 | 119 | 0 | 0 | 1 | 1 ppb |
| Pleasant Hill Estates HOA MT0000088 | 90 | 0 | 0 | 1 | 2 ppb |
| Pleasant View Homesites W and S District MT0000086 | 85 | 0 | 0 | 1 | 0 ppb |
| Skyview Park MT0002516 | 55 | 0 | 0 | 1 | 2 ppb |
| Ap Kookoosint MT0004929 | 40 | 0 | 0 | 2 | 1 ppb |
| Swan Ridge HOA MT0004770 | 28 | 0 | 0 | 1 | 1 ppb |
| Big Mountain Water Company MT0000060 | 2,435 | 0 | 0 | 0 | 7 ppb |
| Lakeside Water System MT0000266 | 1,225 | 0 | 0 | 0 | 3 ppb |
| Hungry Horse Co Water and Sewer District MT0000253 | 1,135 | 0 | 0 | 0 | 0 ppb |
| Meadow Lake Co Water and Sewer District MT0000914 | 950 | 0 | 0 | 0 | 2 ppb |
| Somers Co Water and Sewer Dist MT0000332 | 765 | 0 | 0 | 0 | 2 ppb |
| Ptarmigan Village INC MT0000133 | 600 | 0 | 0 | 0 | 3 ppb |
| Headquarters Apgar MT0003176 | 500 | 0 | 0 | 0 | 2 ppb |
| Country Estates Water Supply MT0002846 | 490 | 0 | 0 | 0 | 1 ppb |
| Flathead Co Water District No 8 MT0000261 | 475 | 0 | 0 | 0 | 0 ppb |
| Coram County Water and Sewer District MT0000189 | 450 | 0 | 0 | 0 | 1 ppb |
| Greenacres County Water and Sewer Dist MT0001923 | 450 | 0 | 0 | 0 | 2 ppb |
| Meadow Manor MT0004397 | 410 | 0 | 0 | 0 | 1 ppb |
ZIP reports in Flathead 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: 59916, 59927.
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.