Washington — 4th District
119th Congress · 93 ZIP codes · Avg score 69/100 · Grade C · Updated 2026-07-19
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-19
ZipCheckup tracks water safety for 93 ZIP codes in Washington's 4th District: the district earns a grade C (69/100). 334 EPA violations on record, 44 health-based.
Top Contaminants
ZIP Codes in This District
93 ZIP codes tracked in Washington's 4th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 98617 | Dallesport | 83 | B | 1 |
| 2 | 98843 | Orondo | 83 | B | 1 |
| 3 | 98851 | Soap Lake | 83 | B | 1 |
| 4 | 98932 | Granger | 83 | B | 1 |
| 5 | 99123 | Electric City | 83 | B | 1 |
| 6 | 99133 | Grand Coulee | 83 | B | 0 |
| 7 | 99321 | Beverly | 83 | B | 0 |
| 8 | 99357 | Royal City | 83 | B | 1 |
| 9 | 98650 | Trout Lake | 82 | B | 2 |
| 10 | 98902 | Yakima | 82 | B | 5 (1 health) |
| 11 | 98904 | Yakima | 82 | B | 5 (1 health) |
| 12 | 98907 | Yakima | 82 | B | 5 (1 health) |
| 13 | 98909 | Yakima | 82 | B | 5 (1 health) |
| 14 | 98935 | Mabton | 82 | B | 2 |
| 15 | 98944 | Sunnyside | 82 | B | 2 |
| 16 | 98953 | Zillah | 82 | B | 3 (1 health) |
| 17 | 99349 | Mattawa | 82 | B | 12 (1 health) |
| 18 | 98620 | Goldendale | 81 | B | 2 |
| 19 | 98824 | George | 81 | B | 4 |
| 20 | 98930 | Grandview | 81 | B | 8 (2 health) |
| 21 | 98813 | Bridgeport | 80 | B | 1 |
| 22 | 98936 | Moxee | 80 | B | 3 |
| 23 | 99301 | Pasco | 80 | B | 13 (3 health) |
| 24 | 99350 | Prosser | 80 | B | 6 |
| 25 | 98850 | Rock Island | 79 | B | 5 |
| 26 | 98933 | Harrah | 79 | B | 2 |
| 27 | 99115 | Coulee City | 79 | B | 5 |
| 28 | 99302 | Pasco | 79 | B | 13 (3 health) |
| 29 | 98623 | Husum | 78 | B | 4 |
| 30 | 98672 | White Salmon | 78 | B | 9 (2 health) |
| 31 | 98832 | Marlin | 78 | B | 5 (1 health) |
| 32 | 98857 | Warden | 78 | B | 4 |
| 33 | 98858 | Waterville | 78 | B | 5 |
| 34 | 99320 | Benton City | 78 | B | 0 |
| 35 | 99352 | Richland | 78 | B | 0 |
| 36 | 99354 | Richland | 78 | B | 0 |
| 37 | 98901 | Yakima | 77 | B | 5 (1 health) |
| 38 | 98942 | Selah | 77 | B | 2 (1 health) |
| 39 | 98848 | Quincy | 75 | B | 11 |
| 40 | 98802 | East Wenatchee | 73 | B | 11 |
| 41 | 98948 | Toppenish | 73 | B | 15 |
| 42 | 98837 | Moses Lake | 72 | B | 16 |
| 43 | 98903 | Yakima | 72 | B | 5 (1 health) |
| 44 | 98908 | Yakima | 72 | B | 5 (1 health) |
| 45 | 99353 | West Richland | 72 | B | 7 |
| 46 | 98937 | Naches | 71 | B | 2 |
| 47 | 98823 | Ephrata | 70 | B | 13 |
| 48 | 98841 | Omak | 70 | B | 0 |
| 49 | 98856 | Twisp | 70 | B | 1 |
| 50 | 98812 | Brewster | 69 | C | 11 (1 health) |
Overview
Washington's 4th District encompasses 93 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (69/100).
334 EPA violations have been recorded across this district's water systems. 44 are health-based violations. About 61% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Consumer Confidence Report Rule - 89 violations
- Lead - 59 violations
- Surface Water Treatment Rule - 49 violations
- Total Trihalomethanes (TTHM) - 34 violations
- Haloacetic Acids (HAA5) - 31 violations
Housing Context
Homes in this district were built on average around 1977 (~49 years old). Older homes may have lead pipes or solder - consider a water filter if your home predates 1986.
Data Sources
- Water quality violations: EPA Safe Drinking Water Information System (SDWIS)
- Congressional district boundaries: U.S. Census Bureau, 119th Congress
- Housing age: U.S. Census Bureau American Community Survey
Updated daily. Data covers 93 ZIP codes in Washington's 4th District.