A80/100
PIONEER WATER & SEWER DISTRICT — Water Quality Report 2026
Serving 1,500 people · Wyoming
Water Source
Purchased Surface Water
County
—
System ID
WY5600828
Violations
9
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
0
Health-Related
TIER 3Resolved
Failed to complete routine monitoring
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: November 1, 2024 – November 30, 2024Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: November 1, 2024 – November 30, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed to complete routine monitoring
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 1, 2022 – April 30, 2022Rule: 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 PIONEER WATER & SEWER DISTRICT
Is PIONEER WATER & SEWER DISTRICT water safe to drink?
PIONEER WATER & SEWER DISTRICT water receives a grade of A (80/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has PIONEER WATER & SEWER DISTRICT detected?
2 contaminants were tested in PIONEER WATER & SEWER DISTRICT's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does PIONEER WATER & SEWER DISTRICT have any EPA violations?
Yes, PIONEER WATER & SEWER DISTRICT has 9 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MON, Other.
How many people does PIONEER WATER & SEWER DISTRICT serve?
PIONEER WATER & SEWER DISTRICT serves approximately 1,500 people, Wyoming. The system provides water to 1 community: Mills.
What type of water does PIONEER WATER & SEWER DISTRICT provide?
PIONEER WATER & SEWER DISTRICT sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WY5600828.
How does PIONEER WATER & SEWER DISTRICT compare to other utilities in Wyoming?
PIONEER WATER & SEWER DISTRICT 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.