B78/100
PROSSER CITY OF — Water Quality Report 2026
Serving 6,211 people · Washington
Water Source
Groundwater
County
—
System ID
WA5369750
Violations
11
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 280.00 µg/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: January 1, 2023 – December 31, 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 PROSSER CITY OF
Is PROSSER CITY OF water safe to drink?
PROSSER CITY OF water receives a grade of B (78/100), which is considered good. Out of 51 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has PROSSER CITY OF detected?
51 contaminants were tested in PROSSER CITY OF's water. Notable contaminants include chlorate. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does PROSSER CITY OF have any EPA violations?
Yes, PROSSER CITY OF has 11 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, Other, MCL. 2 are health-based violations.
How many people does PROSSER CITY OF serve?
PROSSER CITY OF serves approximately 6,211 people, Washington.
What type of water does PROSSER CITY OF provide?
PROSSER CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5369750.
How does PROSSER CITY OF compare to other utilities in Washington?
PROSSER CITY OF scores 78/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Washington state page for a full comparison of water systems.