A86/100
GILLETTE, CITY OF — Water Quality Report 2026
Serving 32,222 people · Wyoming
Water Source
Groundwater
County
—
System ID
WY5600019
Violations
4
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
strontium | 2000.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2023 – December 31, 2023Rule: Stage 1 DBPREnforcement: 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: June 1, 2023 – June 30, 2023Rule: Total Coliform 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 GILLETTE, CITY OF
Is GILLETTE, CITY OF water safe to drink?
GILLETTE, CITY OF water receives a grade of A (86/100), which is considered excellent. Out of 66 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has GILLETTE, CITY OF detected?
66 contaminants were tested in GILLETTE, CITY OF's water. Notable contaminants include Lead (90th percentile), strontium. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does GILLETTE, CITY OF have any EPA violations?
Yes, GILLETTE, CITY OF has 4 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, MON, MCL. 1 are health-based violations.
How many people does GILLETTE, CITY OF serve?
GILLETTE, CITY OF serves approximately 32,222 people, Wyoming. The system provides water to 1 community: Gillette.
What type of water does GILLETTE, CITY OF provide?
GILLETTE, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WY5600019.
How does GILLETTE, CITY OF compare to other utilities in Wyoming?
GILLETTE, CITY OF scores 86/100 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.