Great Falls, Montana Water Quality Report
Water quality data for 22 water systems serving 66,013 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 80.8 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 808% | Above guideline |
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Compliance & Violations
Active Violations (11)
66
Dec 30, 2024
72
Oct 1, 2024
72
Oct 1, 2023
72
Oct 1, 2023
72
Oct 1, 2023
71
Jul 1, 2023
71
Jul 1, 2023
71
Jul 1, 2023
72
Oct 1, 2022
71
Jul 1, 2022
71
Jul 1, 2022
Resolved Violations (489)
34
Jul 22, 2025
34
Jul 22, 2025
34
Jul 22, 2025
3A
Jul 1, 2025 — Jul 31, 2025
71
Jul 1, 2025
+ 484 more resolved violations
Frequently Asked Questions
Is Great Falls tap water safe to drink?
Great Falls's water meets all EPA maximum contaminant levels. However, 1 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Great Falls tap water?
1 contaminants have been detected in Great Falls's water supply across 22 water systems. See the full contaminant table above for details.
How can I improve my water quality in Great Falls?
Install a water filter rated for the specific contaminants found in Great Falls's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Great Falls have any water quality violations?
Yes, Great Falls currently has 44 active violations. See the violations section above for details.