Great Falls Water Quality
Montana
According to EPA SDWIS, Great Falls, Montana is served by 18 community water systems covering about 65,624 people. The same extract lists 19 health-based violation records, most recently coded 8000 in 2023. Counts are historical EPA registry rows, not a current compliance or drinkability score.
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.
PlainEnviro's health-based SDWIS extract shows 19 violation records across the 18 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 5 distinct EPA contaminant codes: Revised Total Coliform Rule, Total Haloacetic Acids (HAA5), Arsenic, Groundwater Rule, Lead and Copper Rule. 3 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. 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?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| HOMESTEAD ACRES COUNTY WATER AND SEWER | Revised Total Coliform Rule | 2023-08-04 |
| HOMESTEAD ACRES COUNTY WATER AND SEWER | Revised Total Coliform Rule | 2023-08-04 |
| BIG BEND RANCH SUBDIVISION | Revised Total Coliform Rule | 2022-03-25 |
| BIG BEND RANCH SUBDIVISION | Revised Total Coliform Rule | 2022-03-25 |
| GREAT FALLS CITY OF | Total Haloacetic Acids (HAA5) | 2019-04-01 |
| GREAT FALLS CITY OF | Total Haloacetic Acids (HAA5) | 2019-01-01 |
| GREAT FALLS CITY OF | Total Haloacetic Acids (HAA5) | 2018-10-01 |
| GREAT FALLS CITY OF | Total Haloacetic Acids (HAA5) | 2018-07-01 |
| GREAT FALLS CITY OF | Total Haloacetic Acids (HAA5) | 2018-04-01 |
| SPRING TREE RIDGE | Revised Total Coliform Rule | 2017-04-07 |
| SOUTH WIND WATER AND SEWER DISTRICT | Arsenic | 2016-07-01 |
| SOUTH WIND WATER AND SEWER DISTRICT | Arsenic | 2016-04-01 |
| SOUTH WIND WATER AND SEWER DISTRICT | Arsenic | 2016-01-01 |
| SOUTH WIND WATER AND SEWER DISTRICT | Arsenic | 2015-10-01 |
| SOUTH WIND WATER AND SEWER DISTRICT | Groundwater Rule | 2011-07-08 |
| BIG BEND RANCH SUBDIVISION | Lead and Copper Rule | 2007-03-28 |
| BIG BEND RANCH SUBDIVISION | Lead and Copper Rule | 2006-11-28 |
| SOUTH WIND WATER AND SEWER DISTRICT | Lead and Copper Rule | 2006-03-07 |
| SOUTH WIND WATER AND SEWER DISTRICT | Lead and Copper Rule | 2005-11-07 |
What are Great Falls's health-based records for?
Great Falls's health-based violation records carry 5 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Revised Total Coliform Rule | 5 | 3 |
| Total Haloacetic Acids (HAA5) | 5 | 1 |
| Lead and Copper Rule | 4 | 2 |
| Arsenic | 4 | 1 |
| Groundwater Rule | 1 | 1 |
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
What does EPA SDWIS list for drinking water in Great Falls, Montana? ▼
How many water violations does Great Falls have in this EPA extract? ▼
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? ▼
How does Great Falls compare in Montana?
Of the 217 Montana places with at least one community water system on file, Great Falls ranks #8 by number of systems (18).
Either side of it: Columbia Falls (27), East Helena (18), Pablo (18), Bigfork (17)
About This Data
Figures here are the current EPA SDWIS extract joined to the 18 community water systems whose service area lists Great Falls, ranked against the 217 Montana places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
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.