F0/100
LIBBY CITY OF — Water Quality Report 2026
Serving 4,892 people · Montana
Water Source
Surface Water
County
—
System ID
MT0000274
Violations
102
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.40 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
3
Health-Related
TIER 2Resolved
Failed treatment technique requirements
When: March 1, 2022 – March 31, 2022Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 1 — URGENTResolved
Violation related to Nitrate
When: March 1, 2022 – March 31, 2022Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 1 — URGENTResolved
Violation related to Nitrate
When: October 1, 2021 – October 31, 2021Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
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 LIBBY CITY OF
Is LIBBY CITY OF water safe to drink?
LIBBY CITY OF water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 102 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has LIBBY CITY OF detected?
32 contaminants were tested in LIBBY CITY OF's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does LIBBY CITY OF have any EPA violations?
Yes, LIBBY CITY OF has 102 EPA violation(s) on record, with the most recent in 2022. Violation types include TT, MR, Other. 18 are health-based violations.
How many people does LIBBY CITY OF serve?
LIBBY CITY OF serves approximately 4,892 people, Montana. The system provides water to 1 community: Libby.
What type of water does LIBBY CITY OF provide?
LIBBY 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 MT0000274.
How does LIBBY CITY OF compare to other utilities in Montana?
LIBBY CITY OF scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Montana state page for a full comparison of water systems.