Water Quality in 59401 — Great Falls, MT
EPA data for GREAT FALLS CITY OF
Data source: U.S. Environmental Protection Agency (EPA) SDWIS Last verified: March 16, 2026
Your Water System
ZIP code 59401 in Great Falls, Montana is served by GREAT FALLS CITY OF (EPA ID: MT0000525). This system provides water to approximately 60,000 people from surface water sources.
There are 30 community water systems serving this area.
Lead & Copper in Your Water
No Lead & Copper Rule sampling data available for systems serving this ZIP code.
Violation Summary
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| November 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| April 1, 2024 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| April 1, 2024 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| April 1, 2024 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| April 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| April 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| April 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| October 1, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
| October 1, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
| July 1, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
| July 1, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
| July 1, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
| July 1, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for water systems serving this ZIP code:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Surface Water Treatment Rule | Treatment Technique | 6 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 3 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 3 | No |
| Stage 1 DBP Rule | Treatment Technique | 1 | No |
| Consumer Confidence Report Rule | Reporting | 1 | No |
Need help with your water quality?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| GREAT FALLS CITY OF | MT0000525 | 60,000 | Surface water |
| MALMSTROM AIR FORCE BASE | MT0000515 | 8,850 | Surface water |
| SUN PRAIRIE VILLAGE COUNTY | MT0000521 | 1,800 | Groundwater |
| PRAIRIE WATER COMPANY | MT0003539 | 1,000 | Surface water |
| COUNTRYSIDE VILLAGE MHP GRT FLS | MT0004830 | 600 | Surface water |
What You Can Do
- Review your annual Consumer Confidence Report (CCR) — Your utility publishes this each July
- Test your home’s water — Especially if you have older plumbing (pre-1986) that may contain lead
- Stay informed — Bookmark this page to check for updates on your water quality
Need help with water testing or filtration?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Other Water Quality Reports in Montana
- 59001 (Absarokee) — 3 violations
- 59003 (Ashland) — 67 violations
- 59008 (Belfry)
- 59011 (Big Timber)
- 59014 (Bridger) — 3 violations
- 59015 (Broadview) — 3 violations
- 59018 (Clyde Park) — 6 violations
- 59019 (Columbus) — 117 violations
- 59020 (Cooke City) — 12 violations
- 59027 (Emigrant) — 5 violations
- 59029 (Fromberg) — 23 violations
- 59030 (Gardiner)
- 59032 (Grass Range) — 9 violations
- 59033 (Greycliff)
- 59034 (Hardin) — 26 violations
- 59035 (Fort Smith) — 83 violations
- 59036 (Harlowton) — 17 violations
- 59037 (Huntley) — 2 violations
- 59038 (Hysham) — 42 violations
- 59041 (Joliet) — 12 violations
Nearby Water Quality Reports
- 59601 (Helena) — 71 mi — 12 violations
- 59053 (Martinsdale) — 83 mi — 2 violations
- 59036 (Harlowton) — 100 mi — 17 violations
- 59032 (Grass Range) — 119 mi — 9 violations
- 59018 (Clyde Park) — 120 mi — 6 violations
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for GREAT FALLS CITY OF (MT0000525) on EPA.gov.
Frequently Asked Questions
Is the tap water in 59401 safe to drink?
Based on EPA records, the water system serving ZIP code 59401 has only monitoring/reporting violations, which are procedural in nature. However, individual home conditions (old pipes, well water) can affect quality.
Where does 59401’s water come from?
The primary water source for this area is surface water. GREAT FALLS CITY OF serves approximately 60,000 people.
How can I get my water tested?
Contact your local water utility for a free water quality report, or hire a certified lab for independent home water testing. The EPA recommends testing annually if you use a private well.
Does 59401 have lead in the water?
No Lead and Copper Rule sampling data is currently available in EPA records for water systems serving ZIP code 59401. If you are concerned about lead, contact your water utility or have your tap water independently tested.
What is the radon risk in 59401?
Radon zone data is not available for ZIP code 59401. The EPA recommends testing all homes for radon regardless of location, as radon levels can vary significantly even within the same neighborhood.