2026 Rankings

Worst ZIP Codes for Lead in Water in Washington — 2026

Last updated: August 11, 2026

363 ZIP codes ranked by Lead (ppb) #1: ZIP 98260 (Langley, WA) - 104.6 ppb
Lead Violations Lowest Score Safest Flood Risk Energy Cost Radon PFAS Reliability EJ Index Homebuyer Risk CO & Gas Safest Gas Remediation Burden Unresolved Violations (by Utility) Water Equity (by Utility)

Out of 363 ZIP codes with data in Washington, these are the highest-ranked areas for lead (ppb). See also: National Worst ZIP Codes for Lead in Water | All Washington Rankings

Statistic Value
ZIP codes ranked 363
Highest value 104.6 ppb
Median value 3.1 ppb
State Washington

Top 100 Worst ZIP Codes

Rank ZIP Code City State Lead (ppb) Safety Score
1 98260 Langley WA 104.6 ppb —
2 98277 Oak Harbor WA 48.9 ppb —
3 98537 Cosmopolis WA 23.0 ppb —
4 98577 Raymond WA 23.0 ppb 100/100
5 98586 South Bend WA 23.0 ppb 100/100
6 99016 Greenacres WA 20.8 ppb 61/100
7 99023 Mica WA 20.8 ppb —
8 99030 Rockford WA 20.8 ppb —
9 99036 Valleyford WA 20.8 ppb —
10 99037 Veradale WA 20.8 ppb 61/100
11 99206 Spokane WA 20.8 ppb 59/100
12 99216 Spokane WA 20.8 ppb 42/100
13 99223 Spokane WA 20.8 ppb 46/100
14 98631 Long Beach WA 20.0 ppb 100/100
15 98640 Ocean Park WA 20.0 ppb 99/100
16 98641 Oysterville WA 20.0 ppb —
17 98110 Bainbridge Island WA 16.0 ppb 97/100
18 98837 Moses Lake WA 13.1 ppb 50/100
19 98387 Spanaway WA 13.0 ppb 77/100
20 98922 Cle Elum WA 13.0 ppb —
21 98940 Ronald WA 13.0 ppb —
22 98941 Roslyn WA 13.0 ppb —
23 98446 Tacoma WA 12.6 ppb 82/100
24 98597 Yelm WA 12.6 ppb 98/100
25 98329 Gig Harbor WA 12.2 ppb —
26 98349 Lakebay WA 12.2 ppb —
27 98394 Vaughn WA 12.2 ppb —
28 98516 Olympia WA 11.5 ppb 98/100
29 98439 Lakewood WA 11.1 ppb —
30 99001 Airway Heights WA 11.1 ppb 50/100
31 99022 Medical Lake WA 11.1 ppb 48/100
32 99029 Reardan WA 11.1 ppb —
33 99224 Spokane WA 11.1 ppb 47/100
34 98332 Gig Harbor WA 11.0 ppb 100/100
35 98383 Silverdale WA 10.5 ppb 97/100
36 98512 Olympia WA 10.4 ppb 98/100
37 98236 Clinton WA 9.8 ppb —
38 98282 Camano Island WA 9.5 ppb —
39 98530 Bucoda WA 9.0 ppb —
40 98531 Centralia WA 9.0 ppb 80/100
41 98589 Tenino WA 9.0 ppb 98/100
42 98022 Enumclaw WA 8.9 ppb 100/100
43 98092 Auburn WA 8.9 ppb 79/100
44 98249 Freeland WA 8.6 ppb —
45 98367 Port Orchard WA 8.5 ppb 81/100
46 98584 Shelton WA 8.5 ppb 98/100
47 98605 Bingen WA 8.5 ppb —
48 98648 Stevenson WA 8.5 ppb —
49 98651 Underwood WA 8.5 ppb —
50 98501 Olympia WA 8.0 ppb 80/100
51 98335 Gig Harbor WA 7.6 ppb 98/100
52 98354 Milton WA 7.4 ppb 100/100
53 98371 Puyallup WA 7.4 ppb 80/100
54 98372 Puyallup WA 7.4 ppb 79/100
55 98422 Tacoma WA 7.4 ppb 99/100
56 98424 Tacoma WA 7.4 ppb 99/100
57 98042 Kent WA 7.1 ppb 82/100
58 98311 Bremerton WA 7.0 ppb 98/100
59 98345 Keyport WA 7.0 ppb —
60 98370 Poulsbo WA 7.0 ppb 93/100
61 98536 Copalis Crossing WA 7.0 ppb —
62 98571 Pacific Beach WA 7.0 ppb —
63 98502 Olympia WA 6.6 ppb 69/100
64 98382 Sequim WA 6.5 ppb 83/100
65 99004 Cheney WA 6.5 ppb 49/100
66 98373 Puyallup WA 6.4 ppb 81/100
67 98374 Puyallup WA 6.4 ppb 79/100
68 98375 Puyallup WA 6.4 ppb 80/100
69 98520 Aberdeen WA 6.4 ppb 97/100
70 98563 Montesano WA 6.4 ppb 98/100
71 98027 Issaquah WA 6.2 ppb 98/100
72 98312 Bremerton WA 6.0 ppb 97/100
73 98503 Lacey WA 6.0 ppb 82/100
74 98506 Olympia WA 6.0 ppb 82/100
75 98513 Olympia WA 6.0 ppb 97/100
76 98325 Chimacum WA 5.9 ppb 99/100
77 98339 Port Hadlock WA 5.9 ppb 100/100
78 98365 Port Ludlow WA 5.9 ppb —
79 98376 Quilcene WA 5.9 ppb —
80 98014 Carnation WA 5.8 ppb 99/100
81 98052 Redmond WA 5.8 ppb 83/100
82 98053 Redmond WA 5.8 ppb 83/100
83 98074 Sammamish WA 5.8 ppb 83/100
84 98077 Woodinville WA 5.8 ppb 100/100
85 98321 Buckley WA 5.8 ppb 92/100
86 98815 Cashmere WA 5.8 ppb —
87 98836 Monitor WA 5.8 ppb 100/100
88 98225 Bellingham WA 5.6 ppb 100/100
89 98226 Bellingham WA 5.6 ppb 98/100
90 98230 Blaine WA 5.6 ppb 89/100
91 98248 Ferndale WA 5.6 ppb 86/100
92 98264 Lynden WA 5.6 ppb 92/100
93 98303 Anderson Island WA 5.6 ppb —
94 98351 Longbranch WA 5.6 ppb —
95 98239 Coupeville WA 5.5 ppb —
96 98362 Port Angeles WA 5.5 ppb 96/100
97 98363 Port Angeles WA 5.5 ppb 97/100
98 98392 Suquamish WA 5.5 ppb —
99 99212 Spokane WA 5.4 ppb 47/100
100 98232 Bow WA 5.3 ppb —

Methodology

Lead rankings are based on the 90th percentile lead testing value (PB90) reported by water systems under the Lead and Copper Rule. When CCR data is unavailable, EPA SDWIS lead sampling data is used. The EPA action level for lead is 15 ppb (0.015 mg/L). There is no safe level of lead exposure.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-08-11.

Frequently Asked Questions

What is a dangerous lead level in water?

The EPA action level is 15 parts per billion (ppb). The American Academy of Pediatrics recommends no more than 1 ppb for school drinking water. There is no safe level of lead exposure for children.

How is lead measured in water?

Water systems collect samples from homes with known lead service lines or lead solder. The 90th percentile value (PB90) means 90% of samples tested below that level. If PB90 exceeds 15 ppb, the system must take corrective action.

Explore More Rankings

How this ranking is calculated, data sources, and limitations: Rankings Methodology →

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Disclaimer: Rankings are based on EPA, FEMA, and federal agency data. They reflect historical patterns and risk indicators, not necessarily current conditions. For the most current information, contact your local water utility or request a Consumer Confidence Report.

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