Great Falls Water Quality
Montana
The tap water in Great Falls, Montana is served by 18 EPA-regulated water systems covering approximately 65,624 people. 19 health-based violations are on record, most recently for 8000 in 2023. Data source: EPA Safe Drinking Water Information System.
Drinking water in Great Falls, Montana is delivered through 18 EPA-regulated community water systems serving an estimated 65,624 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
The SDWIS record for Great Falls shows 19 total violations across all 18 systems, of which 19 are health-based, meaning either a Maximum Contaminant Level (MCL) was exceeded or a required treatment technique was not followed. Contaminants cited in health-based violations include 8000, 2456, 1005, 0700, 5000. 3 TRI-reporting industrial facilities are also located within the city limits.
A past EPA violation does not mean the water is currently unsafe, utilities are required to notify customers and remediate under state primacy oversight. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Montana drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| GREAT FALLS CITY OF | 60,000 | 5 | Health |
| SUN PRAIRIE VILLAGE COUNTY | 1,800 | 0 | Clean |
| PRAIRIE WATER COMPANY | 1,000 | 0 | Clean |
| GORE HILL COUNTY WATER DIST | 500 | 0 | Clean |
| HOMESTEAD ACRES COUNTY WATER AND SEWER | 500 | 2 | Health |
| HIGHWOOD MOBILE HOME PARK | 400 | 0 | Clean |
| SUN PRAIRIE WATER DISTRICT | 350 | 0 | Clean |
| GREAT FALLS RV PARK | 274 | 0 | Clean |
| SOUTH WIND WATER AND SEWER DISTRICT | 200 | 7 | Health |
| PLEASANT PARK COMMUNITY INC | 125 | 0 | Clean |
| BIG BEND RANCH SUBDIVISION | 100 | 4 | Health |
| SPRING TREE RIDGE | 80 | 1 | Health |
| GRASSLAND COLONY | 80 | 0 | Clean |
| PARK GARDEN ESTATES | 50 | 0 | Clean |
| WINDY ACRES WUA | 50 | 0 | Clean |
| COBBLESTONE COURT | 50 | 0 | Clean |
| BIG SKY MOBILE HOME PARK | 40 | 0 | Clean |
| HIGH PLAINS H2O LLC | 25 | 0 | Clean |
Does this city have health-based water violations?
Health-based violations indicate contaminant levels that exceeded EPA maximum contaminant levels (MCLs). This does not necessarily mean water is currently unsafe.
| Contaminant | Begin Date |
|---|---|
| 8000 | 2023-08-04 |
| 8000 | 2023-08-04 |
| 8000 | 2022-03-25 |
| 8000 | 2022-03-25 |
| 2456 | 2019-04-01 |
| 2456 | 2019-01-01 |
| 2456 | 2018-10-01 |
| 2456 | 2018-07-01 |
| 2456 | 2018-04-01 |
| 8000 | 2017-04-07 |
| 1005 | 2016-07-01 |
| 1005 | 2016-04-01 |
| 1005 | 2016-01-01 |
| 1005 | 2015-10-01 |
| 0700 | 2011-07-08 |
| 5000 | 2007-03-28 |
| 5000 | 2006-11-28 |
| 5000 | 2006-03-07 |
| 5000 | 2005-11-07 |
TRI Facilities in Great Falls
| Facility | Total Releases |
|---|---|
| Calumet Montana Refining Llc. | 607.1K lbs |
| Chs Great Falls Feed | 0 lbs |
| US Dod Usaf 120 Aw Montana Ang (range) | 0 lbs |
Frequently Asked Questions
Is Great Falls, Montana water safe to drink? ▼
How many water violations does Great Falls have? ▼
What contaminants were found in Great Falls water? ▼
How many water systems serve Great Falls? ▼
Where does Great Falls get its drinking water? ▼
Are there pollution sources near Great Falls? ▼
About This Data
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). Violations are reported by state agencies to EPA and include both health-based (MCL exceedances) and monitoring/reporting violations.
A reported violation does not necessarily mean water is currently unsafe to drink. Many violations are resolved quickly, and public water systems are required to notify customers of significant issues. For current water quality, contact your local water utility.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.