State
Montana: drinking water records
EPA lists 818 community water systems serving homes in Montana. 40 took part in EPA's national PFAS survey (UCMR 5), and 5 found at least one PFAS above the level laboratories can measure.
In focus818community water systems
Public records. Clearer context.
0
ZIP reports published
818
community water systems
149
systems with a health-based violation since 2016
36
systems that reached the lead action level since 2016
Counties
- Beaverhead County 9 systems
- Big Horn County 5 systems
- Blaine County 6 systems
- Broadwater County 2 systems
- Carbon County 12 systems
- Carter County 2 systems
- Cascade County 41 systems
- Chouteau County 12 systems
- Custer County 4 systems
- Daniels County 2 systems
- Dawson County 8 systems
- Deer Lodge County 6 systems
- Fallon County 4 systems
- Fergus County 11 systems
- Flathead County 136 systems
- Gallatin County 62 systems
- Garfield County 1 systems
- Glacier County 12 systems
- Golden Valley County 2 systems
- Granite County 1 systems
- Hill County 9 systems
- Jefferson County 14 systems
- Judith Basin County 4 systems
- Lake County 26 systems
- Lewis and Clark County 51 systems
- Liberty County 8 systems
- Lincoln County 18 systems
- Madison County 13 systems
- McCone County 2 systems
- Meagher County 3 systems
- Mineral County 9 systems
- Missoula County 82 systems
- Musselshell County 4 systems
- Park County 16 systems
- Petroleum County 1 systems
- Phillips County 7 systems
- Pondera County 10 systems
- Powder River County 1 systems
- Powell County 2 systems
- Prairie County 0 systems
- Ravalli County 23 systems
- Richland County 5 systems
- Roosevelt County 4 systems
- Rosebud County 4 systems
- Sanders County 12 systems
- Sheridan County 5 systems
- Silver Bow County 3 systems
- Stillwater County 7 systems
- Sweet Grass County 3 systems
- Teton County 9 systems
- Toole County 15 systems
- Treasure County 1 systems
- Valley County 8 systems
- Wheatland County 8 systems
- Wibaux County 1 systems
- Yellowstone County 46 systems
ZIP reports
Sources
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.