C47/100
SHELBY CITY OF — Water Quality Report 2026
Serving 3,970 people · Montana
Water Source
Groundwater
County
—
System ID
MT0000328
Violations
26
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
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 SHELBY CITY OF
Is SHELBY CITY OF water safe to drink?
SHELBY CITY OF water receives a grade of C (47/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 26 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has SHELBY CITY OF detected?
51 contaminants were tested in SHELBY CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does SHELBY CITY OF have any EPA violations?
Yes, SHELBY CITY OF has 26 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, Other, MCL. 6 are health-based violations.
How many people does SHELBY CITY OF serve?
SHELBY CITY OF serves approximately 3,970 people, Montana. The system provides water to 1 community: Shelby.
What type of water does SHELBY CITY OF provide?
SHELBY CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MT0000328.
How does SHELBY CITY OF compare to other utilities in Montana?
SHELBY CITY OF scores 47/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Montana state page for a full comparison of water systems.