A96/100
TOPPENISH WATER DEPARTMENT — Water Quality Report 2026
Serving 8,950 people · Washington
Water Source
Groundwater
County
—
System ID
WA5388850
Violations
4
Contaminant Test Results
EPA Violation History
2
Violations (last 5yr)
2
Unresolved
0
Health-Related
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 TOPPENISH WATER DEPARTMENT
Is TOPPENISH WATER DEPARTMENT water safe to drink?
TOPPENISH WATER DEPARTMENT water receives a grade of A (96/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has TOPPENISH WATER DEPARTMENT detected?
31 contaminants were tested in TOPPENISH WATER DEPARTMENT's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does TOPPENISH WATER DEPARTMENT have any EPA violations?
Yes, TOPPENISH WATER DEPARTMENT has 4 EPA violation(s) on record, with the most recent in 2025. Violation types include MR.
How many people does TOPPENISH WATER DEPARTMENT serve?
TOPPENISH WATER DEPARTMENT serves approximately 8,950 people, Washington.
What type of water does TOPPENISH WATER DEPARTMENT provide?
TOPPENISH WATER DEPARTMENT sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5388850.
How does TOPPENISH WATER DEPARTMENT compare to other utilities in Washington?
TOPPENISH WATER DEPARTMENT scores 96/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Washington state page for a full comparison of water systems.