A82/100
DILLON CITY OF — Water Quality Report 2026
Serving 4,300 people · Montana
Water Source
Groundwater
County
—
System ID
MT0000201
Violations
7
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.02 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2012.
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 DILLON CITY OF
Is DILLON CITY OF water safe to drink?
DILLON CITY OF water receives a grade of A (82/100), which is considered excellent. Out of 32 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has DILLON CITY OF detected?
32 contaminants were tested in DILLON 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 DILLON CITY OF have any EPA violations?
Yes, DILLON CITY OF has 7 EPA violation(s) on record, with the most recent in 2012. Violation types include MR.
How many people does DILLON CITY OF serve?
DILLON CITY OF serves approximately 4,300 people, Montana. The system provides water to 1 community: Dillon.
What type of water does DILLON CITY OF provide?
DILLON CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MT0000201.
How does DILLON CITY OF compare to other utilities in Montana?
DILLON CITY OF scores 82/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Montana state page for a full comparison of water systems.