C53/100
MOSSYROCK PUBLIC UTILITY CITY OF — Water Quality Report 2026
Serving 1,553 people · Washington
Water Source
Groundwater
County
—
System ID
WA5356350
Violations
36
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – August 29, 2025Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – February 19, 2025Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – September 29, 2023Enforcement: 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 MOSSYROCK PUBLIC UTILITY CITY OF
Is MOSSYROCK PUBLIC UTILITY CITY OF water safe to drink?
MOSSYROCK PUBLIC UTILITY CITY OF water receives a grade of C (53/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 36 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has MOSSYROCK PUBLIC UTILITY CITY OF detected?
1 contaminants were tested in MOSSYROCK PUBLIC UTILITY CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MOSSYROCK PUBLIC UTILITY CITY OF have any EPA violations?
Yes, MOSSYROCK PUBLIC UTILITY CITY OF has 36 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, MCL. 2 are health-based violations.
How many people does MOSSYROCK PUBLIC UTILITY CITY OF serve?
MOSSYROCK PUBLIC UTILITY CITY OF serves approximately 1,553 people, Washington.
What type of water does MOSSYROCK PUBLIC UTILITY CITY OF provide?
MOSSYROCK PUBLIC UTILITY CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5356350.
How does MOSSYROCK PUBLIC UTILITY CITY OF compare to other utilities in Washington?
MOSSYROCK PUBLIC UTILITY CITY OF scores 53/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Washington state page for a full comparison of water systems.