CITY REPORT
WA
23 HEALTH VIOLATIONS
Kennewick, WA Water Quality Report
1 ZIP code · 5 water systems · Updated 2026-03-16
Data: EPA SDWIS Last verified: 2026-03-16
1
ZIP Codes
5
Water Systems
1
ZIPs with Violations
Zone 1
Radon Risk (High)
Overview
We track water quality and home safety data for 1 ZIP code in Kennewick, Washington, covering 5 community water systems serving approximately 114,468 people.
1 of 1 ZIP code (100%) have recorded EPA violations. 23 health-based violations documented.
Water Sources
Kennewick water systems draw from: Groundwater, Surface water.
Lead & Copper
- Lead data: not yet available for Kennewick
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 40 | 1 |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 28 | 1 |
| Contaminant 2005 | Other | 16 | 1 |
| Contaminant 2010 | Other | 16 | 1 |
| Contaminant 2015 | Other | 16 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 99336 | — | 195 | 23 | KENNEWICK CITY OF |
All ZIP Codes in Kennewick
- 99336 — 195 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.