A80/100
MILLS, CITY OF — Water Quality Report 2026
Serving 4,050 people · Wyoming
Water Source
Groundwater Under Influence of Surface Water
County
—
System ID
WY5600036
Violations
8
Contaminant Test Results
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
3
Health-Related
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2025 – March 31, 2025Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2024 – September 30, 2024Rule: Stage 2 DBPREnforcement: 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 MILLS, CITY OF
Is MILLS, CITY OF water safe to drink?
MILLS, CITY OF water receives a grade of A (80/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has MILLS, CITY OF detected?
31 contaminants were tested in MILLS, CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does MILLS, CITY OF have any EPA violations?
Yes, MILLS, CITY OF has 8 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, MR. 3 are health-based violations.
How many people does MILLS, CITY OF serve?
MILLS, CITY OF serves approximately 4,050 people, Wyoming. The system provides water to 1 community: Mills.
What type of water does MILLS, CITY OF provide?
MILLS, CITY OF sources its water from groundwater under influence of surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WY5600036.
How does MILLS, CITY OF compare to other utilities in Wyoming?
MILLS, CITY OF scores 80/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Wyoming state page for a full comparison of water systems.