D24/100
ZILLAH CITY OF — Water Quality Report 2026
Serving 3,518 people · Washington
Water Source
Groundwater
County
—
System ID
WA5399800
Violations
44
Contaminant Test Results
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 1 — URGENTResolved
Maximum Contaminant Level Violation
When: October 1, 2023 – October 31, 2023Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
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: January 1, 2022 – December 31, 2022Enforcement: 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 ZILLAH CITY OF
Is ZILLAH CITY OF water safe to drink?
ZILLAH CITY OF water receives a grade of D (24/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 44 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has ZILLAH CITY OF detected?
1 contaminants were tested in ZILLAH CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does ZILLAH CITY OF have any EPA violations?
Yes, ZILLAH CITY OF has 44 EPA violation(s) on record, with the most recent in 2023. Violation types include MCL, MR, MON. 8 are health-based violations.
How many people does ZILLAH CITY OF serve?
ZILLAH CITY OF serves approximately 3,518 people, Washington.
What type of water does ZILLAH CITY OF provide?
ZILLAH CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5399800.
How does ZILLAH CITY OF compare to other utilities in Washington?
ZILLAH CITY OF scores 24/100 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.