D38/100
WAPATO WATERWORKS — Water Quality Report 2026
Serving 5,255 people · Washington
Water Source
Groundwater
County
—
System ID
WA5392800
Violations
62
Contaminant Test Results
EPA Violation History
3
Violations (last 5yr)
2
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – February 20, 2025Enforcement: Resolving — corrective action underway
TIER 3Unresolved
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.
TIER 3Unresolved
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.
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 WAPATO WATERWORKS
Is WAPATO WATERWORKS water safe to drink?
WAPATO WATERWORKS water receives a grade of D (38/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 62 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has WAPATO WATERWORKS detected?
31 contaminants were tested in WAPATO WATERWORKS's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does WAPATO WATERWORKS have any EPA violations?
Yes, WAPATO WATERWORKS has 62 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, MR.
How many people does WAPATO WATERWORKS serve?
WAPATO WATERWORKS serves approximately 5,255 people, Washington.
What type of water does WAPATO WATERWORKS provide?
WAPATO WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5392800.
How does WAPATO WATERWORKS compare to other utilities in Washington?
WAPATO WATERWORKS scores 38/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Washington state page for a full comparison of water systems.