Washington Cities Ranked by Indoor Radon Levels

Measured averages from Airthings devices across Washington, USA. Action level: 4 pCi/L — the threshold at which remediation is recommended.

Trentwood has the highest measured indoor radon in Washington at 11.3 pCi/L, based on Airthings measurements across 163 cities.

Updated September 28, 2026

Highest city

11.3pCi/L

Trentwood

Washington city average

1.5pCi/L

across 163 cities

Above action level

12/ 163

cities

Washington Cities Ranked by Indoor Radon Levels
#	Location	Avg level	vs action level
1	Trentwood	11.3 pCi/L	2.8× over
2	Granite Falls	10.4 pCi/L	2.6× over
3	Veradale	9.3 pCi/L	2.3× over
4	Otis Orchards-East Farms	8.2 pCi/L	2.0× over
5	Chewelah	8.1 pCi/L	2.0× over
6	Millwood	7.6 pCi/L	1.9× over
7	Airway Heights	7.4 pCi/L	1.8× over
8	Cheney	5.2 pCi/L	1.3× over
9	Spokane Valley	5.0 pCi/L	1.2× over
10	Davenport	4.7 pCi/L	1.2× over
11	Spokane	4.5 pCi/L	1.1× over
12	Oroville	4.1 pCi/L	1.0× over
✓ Below EPA action level (4 pCi/L)
13	Town and Country	4.0 pCi/L	1.0× under
14	Brewster	3.9 pCi/L	1.0× under
15	Dishman	3.8 pCi/L	0.9× under
16	Liberty Lake	3.5 pCi/L	0.9× under
17	Deer Park	3.3 pCi/L	0.8× under
18	Lakewood	3.3 pCi/L	0.8× under
19	Mill Plain	3.2 pCi/L	0.8× under
20	Opportunity	3.1 pCi/L	0.8× under
21	Walnut Grove	3.1 pCi/L	0.8× under
22	Mead	3.0 pCi/L	0.8× under
23	Cle Elum	3.0 pCi/L	0.7× under
24	Riverbend	2.9 pCi/L	0.7× under
25	Fern Prairie	2.8 pCi/L	0.7× under
26	Ephrata	2.8 pCi/L	0.7× under
27	Graham	2.5 pCi/L	0.6× under
28	Pullman	2.5 pCi/L	0.6× under
29	Fairwood	2.2 pCi/L	0.6× under
30	Washougal	2.2 pCi/L	0.5× under
31	Vancouver	2.2 pCi/L	0.5× under
32	Richland	2.1 pCi/L	0.5× under
33	Newport	2.1 pCi/L	0.5× under
34	Hockinson	1.9 pCi/L	0.5× under
35	Ellensburg	1.9 pCi/L	0.5× under
36	Ridgefield	1.8 pCi/L	0.4× under
37	White Salmon	1.7 pCi/L	0.4× under
38	Lake Shore	1.7 pCi/L	0.4× under
39	Brush Prairie	1.6 pCi/L	0.4× under
40	Orchards	1.6 pCi/L	0.4× under
41	Three Lakes	1.6 pCi/L	0.4× under
42	Medical Lake	1.5 pCi/L	0.4× under
43	Felida	1.5 pCi/L	0.4× under
44	Leavenworth	1.5 pCi/L	0.4× under
45	Peaceful Valley	1.5 pCi/L	0.4× under
46	Tanner	1.4 pCi/L	0.4× under
47	Rochester	1.4 pCi/L	0.4× under
48	Sudden Valley	1.4 pCi/L	0.3× under
49	La Center	1.3 pCi/L	0.3× under
50	Minnehaha	1.3 pCi/L	0.3× under
51	Bremerton	1.2 pCi/L	0.3× under
52	West Richland	1.2 pCi/L	0.3× under
53	Alderton	1.2 pCi/L	0.3× under
54	Covington	1.2 pCi/L	0.3× under
55	Eastgate	1.2 pCi/L	0.3× under
56	Frederickson	1.2 pCi/L	0.3× under
57	Meadow Glade	1.1 pCi/L	0.3× under
58	Mirrormont	1.1 pCi/L	0.3× under
59	Battle Ground	1.1 pCi/L	0.3× under
60	Mount Vista	1.0 pCi/L	0.3× under
61	Union Hill-Novelty Hill	1.0 pCi/L	0.3× under
62	Maple Valley	1.0 pCi/L	0.3× under
63	Fall City	0.9 pCi/L	0.2× under
64	Medina	0.9 pCi/L	0.2× under
65	East Wenatchee Bench	0.9 pCi/L	0.2× under
66	Olympia	0.9 pCi/L	0.2× under
67	Bonney Lake	0.9 pCi/L	0.2× under
68	Bellingham	0.9 pCi/L	0.2× under
69	Maple Heights-Lake Desire	0.9 pCi/L	0.2× under
70	Camas	0.8 pCi/L	0.2× under
71	Boulevard Park	0.8 pCi/L	0.2× under
72	Geneva	0.8 pCi/L	0.2× under
73	Kennewick	0.8 pCi/L	0.2× under
74	Blaine	0.8 pCi/L	0.2× under
75	Sumas	0.8 pCi/L	0.2× under
76	Yelm	0.8 pCi/L	0.2× under
77	East Renton Highlands	0.8 pCi/L	0.2× under
78	Elk Plain	0.7 pCi/L	0.2× under
79	West Lake Sammamish	0.7 pCi/L	0.2× under
80	Burien	0.7 pCi/L	0.2× under
81	Issaquah	0.7 pCi/L	0.2× under
82	Point Roberts	0.7 pCi/L	0.2× under
83	Bellevue	0.6 pCi/L	0.2× under
84	Cottage Lake	0.6 pCi/L	0.2× under
85	Enetai	0.6 pCi/L	0.2× under
86	Mercer Island	0.6 pCi/L	0.2× under
87	Gig Harbor	0.6 pCi/L	0.2× under
88	Kingsgate	0.6 pCi/L	0.2× under
89	Seattle	0.6 pCi/L	0.2× under
90	Tacoma	0.6 pCi/L	0.2× under
91	Tanglewilde-Thompson Place	0.6 pCi/L	0.2× under
92	Shoreline	0.6 pCi/L	0.2× under
93	Bryn Mawr-Skyway	0.6 pCi/L	0.2× under
94	Lake Morton-Berrydale	0.6 pCi/L	0.2× under
95	White Center	0.6 pCi/L	0.2× under
96	Salmon Creek	0.6 pCi/L	0.1× under
97	West Lake Stevens	0.6 pCi/L	0.1× under
98	Duvall	0.6 pCi/L	0.1× under
99	Bothell	0.6 pCi/L	0.1× under
100	Kenmore	0.6 pCi/L	0.1× under
101	Lynden	0.6 pCi/L	0.1× under
102	Fircrest	0.5 pCi/L	0.1× under
103	Normandy Park	0.5 pCi/L	0.1× under
104	Carnation	0.5 pCi/L	0.1× under
105	Kirkland	0.5 pCi/L	0.1× under
106	Monroe	0.5 pCi/L	0.1× under
107	Five Corners	0.5 pCi/L	0.1× under
108	Hazel Dell	0.5 pCi/L	0.1× under
109	Renton	0.5 pCi/L	0.1× under
110	Clyde Hill	0.5 pCi/L	0.1× under
111	South Wenatchee	0.5 pCi/L	0.1× under
112	Sequim	0.5 pCi/L	0.1× under
113	Chehalis	0.5 pCi/L	0.1× under
114	Bainbridge Island	0.5 pCi/L	0.1× under
115	Langley	0.5 pCi/L	0.1× under
116	Newcastle	0.5 pCi/L	0.1× under
117	Cathcart	0.5 pCi/L	0.1× under
118	Federal Way	0.5 pCi/L	0.1× under
119	Des Moines	0.5 pCi/L	0.1× under
120	Ames Lake	0.4 pCi/L	0.1× under
121	Puyallup	0.4 pCi/L	0.1× under
122	Redmond	0.4 pCi/L	0.1× under
123	Inglewood-Finn Hill	0.4 pCi/L	0.1× under
124	Lake Forest Park	0.4 pCi/L	0.1× under
125	Sammamish	0.4 pCi/L	0.1× under
126	City of Sammamish	0.4 pCi/L	0.1× under
127	Lake Marcel-Stillwater	0.4 pCi/L	0.1× under
128	Maltby	0.4 pCi/L	0.1× under
129	Vashon	0.4 pCi/L	0.1× under
130	Yarrow Point	0.4 pCi/L	0.1× under
131	East Hill-Meridian	0.4 pCi/L	0.1× under
132	Everett	0.4 pCi/L	0.1× under
133	Meadowdale	0.4 pCi/L	0.1× under
134	Mukilteo	0.4 pCi/L	0.1× under
135	Tumwater	0.4 pCi/L	0.1× under
136	Kingston	0.4 pCi/L	0.1× under
137	Rosedale	0.4 pCi/L	0.1× under
138	Suquamish	0.4 pCi/L	0.1× under
139	University Place	0.4 pCi/L	0.1× under
140	Woodinville	0.4 pCi/L	0.1× under
141	Martha Lake	0.4 pCi/L	0.1× under
142	Mountlake Terrace	0.4 pCi/L	0.1× under
143	Brier	0.3 pCi/L	0.1× under
144	North Bend	0.3 pCi/L	0.1× under
145	Lynnwood	0.3 pCi/L	0.1× under
146	Silver Firs	0.3 pCi/L	0.1× under
147	Alderwood Manor	0.3 pCi/L	0.1× under
148	Mill Creek	0.3 pCi/L	0.1× under
149	Lacey	0.3 pCi/L	0.1× under
150	Snohomish	0.3 pCi/L	0.1× under
151	Lofall	0.3 pCi/L	0.1× under
152	Camano	0.3 pCi/L	0.1× under
153	Lake Stevens	0.3 pCi/L	0.1× under
154	North Creek	0.3 pCi/L	0.1× under
155	Arlington	0.3 pCi/L	0.1× under
156	Fife Heights	0.3 pCi/L	0.1× under
157	Marysville	0.3 pCi/L	0.1× under
158	Burlington	0.3 pCi/L	0.1× under
159	Orting	0.3 pCi/L	0.1× under
160	Port Orchard	0.2 pCi/L	0.1× under
161	Stanwood	0.2 pCi/L	0.0× under
162	Anacortes	0.2 pCi/L	0.0× under
163	Kent	0.2 pCi/L	0.0× under

See USA cities ranked by radon level See all States ranked by radon level