Highest Remediation Burden: Washington — 2026

Out of 194 ZIP codes with data in Washington, these are the areas where estimated safety remediation costs represent the largest share of median home value. See also: National Rankings | All Washington Rankings

Statistic	Value
ZIP codes ranked	194
Highest burden	2.1% of median home value
Median burden	0.1% of median home value
Median estimated cost	$500
State	Washington

Top 100 Highest Remediation Burden ZIP Codes

Rank	ZIP Code	City	State	Est. Cost	Median Home Value	Burden %
1	98586	South Bend	WA	$4,860	$231,900	2.1%
2	98577	Raymond	WA	$4,320	$231,000	1.9%
3	99030	Rockford	WA	$4,800	$283,700	1.7%
4	98537	Cosmopolis	WA	$4,440	$301,400	1.5%
5	99206	Spokane	WA	$4,700	$362,100	1.3%
6	99216	Spokane	WA	$4,200	$336,700	1.3%
7	98640	Ocean Park	WA	$3,240	$297,900	1.1%
8	98631	Long Beach	WA	$3,600	$338,300	1.1%
9	98277	Oak Harbor	WA	$3,540	$455,300	0.8%
10	99223	Spokane	WA	$3,440	$457,200	0.8%
11	98260	Langley	WA	$3,180	$646,100	0.5%
12	98547	Grayland	WA	$600	$192,800	0.3%
13	98110	Bainbridge Island	WA	$3,060	$1,076,200	0.3%
14	99352	Richland	WA	$1,200	$442,100	0.3%
15	98520	Aberdeen	WA	$600	$237,000	0.3%
16	99212	Spokane	WA	$800	$314,300	0.3%
17	99337	Kennewick	WA	$900	$356,700	0.3%
18	98595	Westport	WA	$600	$254,800	0.2%
19	99338	Kennewick	WA	$1,200	$526,700	0.2%
20	98362	Port Angeles	WA	$800	$368,000	0.2%
21	98502	Olympia	WA	$1,100	$496,500	0.2%
22	98387	Spanaway	WA	$900	$424,100	0.2%
23	98837	Moses Lake	WA	$600	$290,000	0.2%
24	99336	Kennewick	WA	$600	$292,300	0.2%
25	98548	Hoodsport	WA	$500	$255,000	0.2%
26	99207	Spokane	WA	$500	$246,800	0.2%
27	99320	Benton City	WA	$600	$300,300	0.2%
28	98239	Coupeville	WA	$1,100	$577,700	0.2%
29	98312	Bremerton	WA	$800	$430,700	0.2%
30	99201	Spokane	WA	$500	$259,800	0.2%
31	99202	Spokane	WA	$500	$268,700	0.2%
32	98188	Seattle	WA	$800	$452,900	0.2%
33	98531	Centralia	WA	$500	$285,700	0.2%
34	99001	Airway Heights	WA	$500	$281,100	0.2%
35	99217	Spokane	WA	$600	$329,300	0.2%
36	98338	Graham	WA	$800	$471,800	0.2%
37	98349	Lakebay	WA	$600	$363,400	0.2%
38	98382	Sequim	WA	$800	$463,800	0.2%
39	98506	Olympia	WA	$800	$469,700	0.2%
40	98674	Woodland	WA	$800	$481,100	0.2%
41	98841	Omak	WA	$500	$288,400	0.2%
42	98938	Outlook	WA	$300	$174,100	0.2%
43	99205	Spokane	WA	$500	$286,300	0.2%
44	99354	Richland	WA	$600	$355,400	0.2%
45	98444	Tacoma	WA	$600	$369,500	0.2%
46	98501	Olympia	WA	$800	$485,200	0.2%
47	98295	Sumas	WA	$600	$408,000	0.1%
48	98445	Tacoma	WA	$600	$413,200	0.1%
49	98503	Lacey	WA	$600	$407,700	0.1%
50	98516	Olympia	WA	$800	$528,000	0.1%
51	98601	Amboy	WA	$800	$517,300	0.1%
52	98604	Battle Ground	WA	$800	$543,500	0.1%
53	98675	Yacolt	WA	$800	$522,500	0.1%
54	98409	Tacoma	WA	$500	$363,000	0.1%
55	98499	Lakewood	WA	$500	$370,000	0.1%
56	98660	Vancouver	WA	$600	$444,300	0.1%
57	98661	Vancouver	WA	$600	$424,700	0.1%
58	98662	Vancouver	WA	$600	$424,200	0.1%
59	98664	Vancouver	WA	$600	$442,300	0.1%
60	98951	Wapato	WA	$300	$214,000	0.1%
61	99004	Cheney	WA	$500	$368,500	0.1%
62	99006	Deer Park	WA	$500	$366,600	0.1%
63	99022	Medical Lake	WA	$500	$345,600	0.1%
64	99204	Spokane	WA	$500	$355,700	0.1%
65	98002	Auburn	WA	$500	$397,700	0.1%
66	98092	Auburn	WA	$800	$594,800	0.1%
67	98230	Blaine	WA	$600	$467,900	0.1%
68	98303	Anderson Island	WA	$600	$477,600	0.1%
69	98337	Bremerton	WA	$500	$386,700	0.1%
70	98339	Port Hadlock	WA	$500	$385,500	0.1%
71	98404	Tacoma	WA	$500	$387,300	0.1%
72	98408	Tacoma	WA	$500	$379,400	0.1%
73	98418	Tacoma	WA	$500	$385,300	0.1%
74	98665	Vancouver	WA	$600	$447,700	0.1%
75	98932	Granger	WA	$300	$230,300	0.1%
76	98003	Federal Way	WA	$500	$428,500	0.1%
77	98247	Everson	WA	$600	$514,400	0.1%
78	98284	Sedro Woolley	WA	$500	$427,900	0.1%
79	98310	Bremerton	WA	$500	$421,600	0.1%
80	98663	Vancouver	WA	$500	$430,900	0.1%
81	98840	Okanogan	WA	$300	$251,700	0.1%
82	99003	Chattaroy	WA	$500	$410,800	0.1%
83	99009	Elk	WA	$500	$402,300	0.1%
84	99021	Mead	WA	$500	$418,200	0.1%
85	99208	Spokane	WA	$500	$414,000	0.1%
86	99218	Spokane	WA	$500	$404,500	0.1%
87	98032	Kent	WA	$500	$473,000	0.1%
88	98233	Burlington	WA	$500	$466,300	0.1%
89	98240	Custer	WA	$600	$566,400	0.1%
90	98248	Ferndale	WA	$600	$550,300	0.1%
91	98262	Lummi Island	WA	$600	$529,000	0.1%
92	98264	Lynden	WA	$600	$538,100	0.1%
93	98273	Mount Vernon	WA	$500	$448,300	0.1%
94	98311	Bremerton	WA	$500	$448,100	0.1%
95	98325	Chimacum	WA	$500	$468,000	0.1%
96	98360	Orting	WA	$500	$466,200	0.1%
97	98366	Port Orchard	WA	$500	$449,700	0.1%
98	98375	Puyallup	WA	$500	$471,900	0.1%
99	98405	Tacoma	WA	$500	$443,800	0.1%
100	98446	Tacoma	WA	$500	$459,500	0.1%

Methodology

The remediation burden ratio is calculated as: estimated remediation cost / median home value. Remediation costs are the sum of applicable safety measures for each ZIP code based on EPA, FEMA, and state data:

Lead service line replacement — cost included where area lead indicators (housing age, water system data, EPA sampling) are elevated; these do not confirm a home's service line
Radon home test - EPA zones are county-level potential categories, not home measurements; mitigation belongs only after a measured result
Whole-home water filtration — cost included where mapped water-system records exceed EPA guidelines; the right treatment depends on the contaminant
Flood insurance — in FEMA-designated flood zones with claim history
PFAS treatment — cost included where PFAS detections have been reported for mapped water systems; a detection alone does not show a home needs treatment

Median home values are from U.S. Census American Community Survey (ACS) estimates. Cost estimates use national average ranges from EPA, HUD, and industry data. Individual home costs may vary significantly based on specific conditions.

Last updated: 2026-10-19.

Frequently Asked Questions

What does "remediation cost relative to home value" mean?

This ratio compares the estimated cost of supported actions (lead pipes, a property-specific radon test, water filtration, and current flood-map verification) to the median home value in that ZIP code. County radon zones never add a mitigation-system cost.

How are remediation costs estimated?

Costs use published benchmarks for supported actions such as lead service line replacement, a property-specific radon test, and water filtration. A county radon zone does not trigger a mitigation-system estimate, and historical FEMA claims do not set an insurance premium.

Why does this matter for homebuyers?

In areas with high estimated remediation burden, the estimated cost of the listed measures can represent a large portion of the median home value; actual needs and costs vary by property. This is especially impactful in lower-value housing markets where a $15,000 remediation bill represents 10-30% of the home price. Standard home inspections may not identify all these issues.

Does a high ratio mean the home is unsafe?

Not necessarily. The ratio reflects potential costs based on area-level environmental data — not every home in the ZIP code will need all remediation work. However, buyers may want to review the underlying ZIP-level indicators and get property-specific inspections before purchasing.