Neighborhood Report
Grade C
Kennewick, WA Neighborhood Water Quality — Grade C
3 ZIP codes · 39 EPA violations
Data source: EPA SDWIS Last verified: 2026-06-04
Water quality varies significantly across Kennewick, WA. We analyzed 3 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.
City Overview: Grade C (58/100)
| Grade | Neighborhoods | % |
|---|---|---|
| A | 0 | 0% |
| B | 0 | 0% |
| C | 3 | 100% |
| D | 0 | 0% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in Kennewick ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 99336 | 58 | C | 13 | 0.0019 mg/L |
| 2 | 99337 | 58 | C | 13 | 0.0019 mg/L |
| 3 | 99338 | 58 | C | 13 | 0.0019 mg/L |
How Neighborhoods Compare
Each ZIP code compared to county and state averages:
- 0 neighborhoods score better than county average
- 3 neighborhoods score worse than county average
EPA Violations
- 39 total violations across Kennewick
- 21 health-based violations
- 3 of 3 ZIP codes have violations
- 0 ZIP codes exceed EPA lead action level
Top Contaminants
| Contaminant | Violations | ZIPs |
|---|---|---|
| Haloacetic Acids (HAA5) | 18 | 3 |
| Total Trihalomethanes (TTHM) | 12 | 3 |
| Contaminant 2959 | 6 | 3 |
| Lead | 3 | 3 |
Frequently Asked Questions
What is the safest neighborhood in Kennewick?
ZIP code 99336 has the highest safety score in Kennewick at 58/100 (grade C). Check the full report for details.
Is Kennewick water safe to drink?
Kennewick has an average water safety score of 58/100 (C). Water quality varies by neighborhood — no ZIP codes currently exceed EPA lead limits. Always check your specific ZIP code.
Related Pages
Data Sources
- EPA SDWIS
- U.S. Census Bureau
Updated daily.