F13/100
PATEROS WATER DEPARTMENT — Water Quality Report 2026
Serving 1,149 people · Washington
Water Source
Groundwater
County
—
System ID
WA5366450
Violations
76
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2024 – December 31, 2024Enforcement: 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 PATEROS WATER DEPARTMENT
Is PATEROS WATER DEPARTMENT water safe to drink?
PATEROS WATER DEPARTMENT water receives a grade of F (13/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 76 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has PATEROS WATER DEPARTMENT detected?
1 contaminants were tested in PATEROS WATER DEPARTMENT's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does PATEROS WATER DEPARTMENT have any EPA violations?
Yes, PATEROS WATER DEPARTMENT has 76 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MON, Other. 2 are health-based violations.
How many people does PATEROS WATER DEPARTMENT serve?
PATEROS WATER DEPARTMENT serves approximately 1,149 people, Washington.
What type of water does PATEROS WATER DEPARTMENT provide?
PATEROS WATER DEPARTMENT sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5366450.
How does PATEROS WATER DEPARTMENT compare to other utilities in Washington?
PATEROS WATER DEPARTMENT scores 13/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Washington state page for a full comparison of water systems.