B64/100
GREAT FALLS CITY OF — Water Quality Report 2026
Serving 60,000 people · Montana
Water Source
Surface Water
County
—
System ID
MT0000525
Violations
9
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.008 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2019.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About GREAT FALLS CITY OF
Is GREAT FALLS CITY OF water safe to drink?
GREAT FALLS CITY OF water receives a grade of B (64/100), which is considered good. Out of 76 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has GREAT FALLS CITY OF detected?
76 contaminants were tested in GREAT FALLS CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does GREAT FALLS CITY OF have any EPA violations?
Yes, GREAT FALLS CITY OF has 9 EPA violation(s) on record, with the most recent in 2019. Violation types include MCL, MR, TT. 6 are health-based violations.
How many people does GREAT FALLS CITY OF serve?
GREAT FALLS CITY OF serves approximately 60,000 people, Montana. The system provides water to 1 community: Great Falls.
What type of water does GREAT FALLS CITY OF provide?
GREAT FALLS CITY OF sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is MT0000525.
How does GREAT FALLS CITY OF compare to other utilities in Montana?
GREAT FALLS CITY OF scores 64/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Montana state page for a full comparison of water systems.