Montana
Fergus County drinking water quality
21 active public water systems serve 11,187 people in Fergus County. 3 are compliant, 18 had at least one EPA violation in the past three years, 0 are designated serious violators, and 2 carry a health flag.
Needs attention
Community water systems
11 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Lewistown City of Lewistown |
5,923 | 1 | 0 | |
|
Mountain Acres MB HM PK Lewistown |
320 | 2 | 0 | |
|
Winifred Town of Winifred |
274 | 7 | 1 | |
|
Denton Town of Denton |
255 | 2 | 1 | |
|
Moore Town of Moore |
186 | 2 | 1 | |
|
Roy Water and Sewer District Roy |
110 | 2 | 0 | |
|
Grass Range Town of Grass Range |
102 | 4 | 0 | |
|
Ayers Hutterite Colony Grass Range |
58 | 0 | 0 | |
|
King Ranch Colony Lewistown |
56 | 4 | 2 | |
|
Deerfield Hutterite Colony Lewistown |
51 | 2 | 1 | |
|
Spring Creek Colony Lewistown Lewistown |
48 | 1 | 0 |
Non-community systems (10: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Lehrkinds Big Spring Water Lewistown |
2,575 | 2 | 0 | |
|
Eddies Corner Moore |
503 | 2 | 0 | |
|
K-M Scout Ranch Water System Great Falls |
325 | 0 | 0 | |
|
Pine Meadows Golf Course Elks 456 the Lewistown |
130 | 2 | 0 | |
|
Big Sky Grocery Unapproved Moore |
90 | 1 | 0 | |
|
HI Heat Industries INC Lewistown |
75 | 2 | 0 | |
|
Judith Mountain Lodge Unapproved Lewistown |
30 | 2 | 0 | |
|
The Hideaway Hilger |
26 | 3 | 2 | |
|
Judith Shadows Golf Course Lewistown |
25 | 1 | 0 | |
|
Town & Country Lewistown Lewistown |
25 | 0 | 0 |
Inactive systems (34, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Montana records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.