CONGRESSIONAL DISTRICT WA

Washington — 4th District

119th Congress · 101 ZIP codes · Avg score 65/100 · Grade C · Updated 2026-06-03

Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03

C
District Grade
65
Avg Safety Score
101
ZIP Codes
3563
Total Violations
122
Health Violations
138
Water Systems
Orondo
Best ZIP: 98843 (83/100)
Keller
Lowest ZIP: 99140 (40/100)

Top Contaminants

Consumer Confidence Report Rule (209) Lead (134) Haloacetic Acids (HAA5) (123) Total Trihalomethanes (TTHM) (103) Surface Water Treatment Rule (88)

ZIP Codes in This District

100 ZIP codes tracked in Washington's 4th District. Showing top 50 by safety score.

# ZIP Code City Safety Score Grade Violations
1 98843 Orondo 83 B 1
2 99133 Grand Coulee 83 B 0
3 99321 Beverly 83 B 0
4 98617 Dallesport 82 B 2
5 98851 Soap Lake 82 B 2
6 98932 Granger 82 B 2
7 98944 Sunnyside 82 B 3
8 99123 Electric City 82 B 2
9 99357 Royal City 82 B 2
10 98605 Bingen 81 B 4
11 98650 Trout Lake 81 B 4
12 98902 Yakima 80 B 89 (3 health)
13 98907 Yakima 80 B 89 (3 health)
14 98824 George 79 B 6
15 98904 Yakima 79 B 89 (3 health)
16 98909 Yakima 79 B 89 (3 health)
17 98935 Mabton 79 B 4
18 98953 Zillah 79 B 8 (3 health)
19 98620 Goldendale 78 B 4
20 99320 Benton City 78 B 0
21 99352 Richland 78 B 0
22 99354 Richland 78 B 0
23 98942 Selah 77 B 3 (1 health)
24 99301 Pasco 77 B 265 (6 health)
25 99302 Pasco 76 B 265 (6 health)
26 99349 Mattawa 76 B 23 (3 health)
27 99350 Prosser 76 B 14
28 98901 Yakima 75 B 89 (3 health)
29 98933 Harrah 75 B 4
30 98813 Bridgeport 74 B 6
31 98857 Warden 74 B 9
32 99115 Coulee City 74 B 13
33 98832 Marlin 73 B 6 (2 health)
34 98926 Ellensburg 73 B 0
35 98850 Rock Island 72 B 10
36 98841 Omak 70 B 0
37 98903 Yakima 70 B 89 (3 health)
38 98908 Yakima 70 B 89 (3 health)
39 98802 East Wenatchee 69 C 21
40 98848 Quincy 69 C 297
41 98930 Grandview 69 C 70 (5 health)
42 98936 Moxee 69 C 152
43 98948 Toppenish 69 C 33
44 98834 Methow 68 C 4
45 98855 Tonasket 67 C 7 (3 health)
46 98937 Naches 67 C 7
47 98829 Malott 66 C 1
48 98856 Twisp 66 C 8
49 99116 Coulee Dam 66 C 0
50 98623 Husum 65 C 60

Overview

Washington's 4th District serving an estimated 2,718,766 residents encompasses 101 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (65/100).

3563 EPA violations have been recorded across this district's water systems. 122 are health-based violations. About 58% 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 — 209 violations
  • Lead — 134 violations
  • Haloacetic Acids (HAA5) — 123 violations
  • Total Trihalomethanes (TTHM) — 103 violations
  • Surface Water Treatment Rule — 88 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

Updated daily. Data covers 101 ZIP codes in Washington's 4th District.

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