A80/100
Mills Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 4,050 residents · Wyoming
What's In Mills's Tap Water?
31
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
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
Water Utility Details
MILLS, CITY OF
Population Served
4,050
Water Source
Groundwater Under Influence of Surface Water
System ID
WY5600036
Frequently Asked Questions About Mills Water
Is Mills tap water safe to drink?
Mills, Wyoming tap water receives a grade of A (80/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA maximum contaminant levels (MCLs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Mills's water?
31 contaminants were tested in Mills's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Mills have any water quality violations?
Yes, Mills has 8 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, MR. 3 of these are health-based violations, which are the most serious category.
Do I need a water filter in Mills?
Mills water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. All contaminants are within health goals.
Where does Mills's tap water come from?
Mills's drinking water is sourced from groundwater under influence of surface water and supplied by MILLS, CITY OF. The system serves approximately 4,050 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Mills's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Mills's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Mills's water compare to other cities in Wyoming?
Mills's water quality score of 80/100 earns a grade of A, which is considered excellent. This places Mills among the better-performing water systems in Wyoming. Visit our Wyoming state page to see how all cities in the state compare.
What should I do if I'm concerned about Mills's water quality?
If you have concerns about Mills's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (MILLS, CITY OF) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.