Washington Tap Water Quality Report

374 cities analyzed • 6,986,941 people served

Updated March 2026 • Data from EWG & EPA SDWIS

374

Cities Analyzed

6.8

Avg Above Guidelines

6,986,941

Total Population Served

Best Water Quality

Po Box 644 (0 above guidelines)

Most Concerns

West Richland (20 above guidelines)

Most Common Contaminants in Washington

Contaminant	Found In	% of Cities
Total trihalomethanes (TTHMs) carcinogen	256 of 374	68%
Nitrate carcinogen	238 of 374	64%
Bromodichloromethane carcinogen	233 of 374	62%
Manganese	226 of 374	60%
Chloroform carcinogen	225 of 374	60%
Dibromochloromethane carcinogen	205 of 374	55%
Haloacetic acids (HAA5) carcinogen	190 of 374	51%
Radium, combined (-226 and -228)	174 of 374	47%
Dichloroacetic acid carcinogen	157 of 374	42%
Trichloroacetic acid carcinogen	148 of 374	40%

City-by-City Water Quality Rankings

Ranked by number of contaminants above EWG health guidelines (most to fewest).

#	City	Detected	Above Guidelines	Above Legal	People Served
1	West Richland	45	20	1	17,410
2	Kennewick	34	19	1	89,224
3	Richland	31	18	1	94,463
4	Sammamish	31	18	1	65,598
5	Federal Way	30	17	0	116,906
6	Po Box 70	27	17	1	5,305
7	Issaquah	30	16	2	39,578
8	Kent	30	15	0	157,101
9	Olympia	23	15	0	113,584
10	Port Orchard	28	15	0	28,721
11	Centralia	23	15	0	28,164
12	Stanwood	21	15	0	13,785
13	Grandview	24	15	0	11,010
14	Deer Park	24	15	0	0
15	Vancouver	25	14	2	373,047
16	Redmond	22	14	0	123,565
17	Yakima	23	14	0	110,598
18	Snohomish	27	14	0	22,932
19	Arlington	24	14	0	19,690
20	Roy	20	14	1	1,214
21	Tacoma	23	13	0	448,771
22	Spokane	26	13	0	343,167
23	Auburn	20	13	0	113,921
24	Lacey	23	13	0	85,727
25	Joint Base Lewis-mcchord	27	13	1	58,497
26	Buckley	24	13	0	38,307
27	Puyallup	25	13	0	36,906
28	Moses Lake	27	13	0	32,428
29	Fife	23	13	0	32,380
30	Camas	21	13	1	31,794
31	Dupont	19	13	1	12,860
32	Carlsborg	20	13	0	11,248
33	Vashon	17	13	1	3,723
34	Algona	20	13	0	3,180
35	Bremerton	21	12	0	72,520
36	Marysville	21	12	0	72,380
37	Lakewood	24	12	0	62,089
38	Battle Ground	21	12	0	28,864
39	Silverdale	19	12	0	26,634
40	Clarkston	20	12	0	22,583
41	Enumclaw	15	12	0	17,242
42	Poulsbo	17	12	0	17,180
43	Snoqualime	17	12	0	15,848
44	Milton	17	12	0	8,078
45	Eastsound	19	12	0	3,681
46	Cashmere	20	12	0	3,165
47	Ephrata	20	12	0	1,108
48	George	17	12	0	0
49	Seattle	17	11	0	1,091,904
50	Bellingham	17	11	0	135,023
51	Pasco	19	11	0	109,345
52	Kenmore	18	11	0	104,722
53	Tumwater	19	11	0	66,373
54	Woodinville	18	11	0	59,873
55	Longview	17	11	0	49,111
56	Tukwila	17	11	0	45,374
57	Shoreline	18	11	0	31,323
58	Spanaway	16	11	0	31,260
59	East Wenatchee	17	11	0	26,519
60	Mercer Island	18	11	0	25,748
61	Oak Harbor	18	11	0	23,587
62	Washougal	15	11	0	19,783
63	Shelton	15	11	0	17,645
64	Yelm	14	11	0	16,633
65	Burien	18	11	0	16,065
66	Sumner	13	11	0	15,530
67	Sequim	16	11	0	14,293
68	Newcastle	17	11	0	14,194
69	Duvall	18	11	0	10,017
70	Granite Falls	18	11	0	6,926
71	Medical Lake	15	11	0	4,982
72	Raymond	14	11	0	4,620
73	Ilwaco	16	11	0	2,757
74	Goldbar	18	11	0	2,661
75	Tonasket	17	11	0	2,392
76	Grand Coulee	12	11	0	1,428
77	Freeland	12	11	0	1,373
78	471 Se Crescent Dr	16	11	0	1,044
79	23215 40th Dr Ne	12	11	0	250
80	Renton	16	10	0	107,119
81	Kirkland	18	10	0	64,795
82	Port Angeles	16	10	0	28,946
83	Ferndale	17	10	0	18,170
84	Kelso	13	10	0	15,097
85	Bainbridge Island	16	10	0	12,429
86	Woodland	11	10	0	10,640
87	Manchester	17	10	0	10,437
88	Birch Bay	19	10	0	8,969
89	Steilacoom	12	10	0	8,421
90	Ocean Park	13	10	0	8,093
91	Friday Harbor	12	10	0	3,531
92	South Bend	15	10	0	2,930
93	Rock Island	10	10	0	2,546
94	Electric City	10	10	0	2,067
95	Republic	12	10	0	1,673
96	Coupeville	13	10	0	900
97	Chinook	13	10	0	664
98	Ione	11	10	0	185
99	Beverly	17	10	0	60
100	Ion	11	10	0	0
101	Bellevue	14	9	0	261,506
102	Mount Vernon	16	9	0	116,371
103	Bothell	14	9	0	32,712
104	Maple Valley	17	9	0	28,671
105	Spokane Valley	16	9	0	24,692
106	Mukilteo	15	9	0	24,428
107	Aberdeen	13	9	0	17,958
108	Lynden	16	9	0	17,458
109	Selah	16	9	0	12,515
110	Chehalis	17	9	0	11,426
111	Orting	10	9	0	10,332
112	North Bend	9	9	0	7,228
113	Westport	14	9	0	5,346
114	Long Beach	11	9	0	4,052
115	Everson	10	9	0	3,762
116	Camano Island	10	9	0	2,588
117	Bridgeport	10	9	0	2,214
118	Cosmopolis	13	9	0	1,812
119	Entiat	11	9	0	1,730
120	Bow	10	9	0	1,480
121	Pe Ell	11	9	0	1,342
122	Palouse	11	9	0	1,298
123	Waterville	12	9	0	1,140
124	Coeur D'alene	10	9	0	1,117
125	Malott	13	9	0	636
126	Nespelem	11	9	0	510
127	Four Lakes	14	9	0	433
128	Lummi Island	13	9	0	357
129	Ashford	10	9	0	309
130	Deer Harbor	14	9	2	108
131	Mansfield	10	9	0	80
132	Oysterville	12	9	0	72
133	Santa Rosa	10	9	0	39
134	Fox Island	16	9	0	0
135	Everett	15	8	0	215,774
136	Lynnwood	16	8	0	197,993
137	Walla Walla	13	8	0	42,959
138	Edmonds	14	8	0	34,023
139	Wenatchee	13	8	0	31,045
140	Mead	19	8	0	26,883
141	Mountlake Terrace	14	8	0	26,402
142	Monroe	15	8	0	24,077
143	Ridgefield	13	8	0	19,670
144	Cheney	13	8	0	17,108
145	Port Townsend	10	8	0	16,790
146	Gig Harbor	8	8	0	14,902
147	Hoquiam	12	8	0	11,456
148	Blaine	13	8	0	6,319
149	Colville	13	8	0	4,878
150	Royal City	16	8	0	3,389
151	Newport	15	8	0	3,258
152	Adna	10	8	0	2,389
153	Onalaska	13	8	0	1,983
154	Mt Vernon	13	8	0	1,890
155	Newman Lake	9	8	0	1,790
156	Mesa	9	8	0	1,740
157	Pateros	15	8	0	1,149
158	Wilkeson	8	8	0	1,062
159	Marshall	11	8	0	1,040
160	Odessa	10	8	0	986
161	Cathlamet	10	8	0	920
162	Anacortes	13	8	0	657
163	Clinton	10	8	0	647
164	Mckenna	8	8	0	600
165	Vashion Island	8	8	0	562
166	South Cle Elum	9	8	0	541
167	Mill Creek	14	8	0	456
168	Ronald	8	8	0	242
169	Colbert	19	8	0	218
170	Marblemount	8	8	0	107
171	Usk	12	8	0	75
172	Castle Rock	8	8	0	67
173	15205 41st Ave Se	14	8	0	1
174	Bingen	16	8	0	0
175	Carbonado	14	8	0	0
176	Wilbur	10	8	0	0
177	Laconner	13	8	0	0
178	North Bonneville	8	8	0	0
179	Kalama	8	7	0	8,020
180	Pacific	8	7	0	7,925
181	Sultan	7	7	0	6,200
182	Moxee	13	7	0	5,602
183	Mattawa	11	7	0	5,015
184	Omak	12	7	0	4,940
185	Naches	8	7	0	3,512
186	Fall City	8	7	0	2,984
187	Joyce	8	7	0	2,360
188	Roslyn	7	7	0	2,099
189	Graham	9	7	0	1,474
190	Coulee Dam	10	7	0	1,359
191	Bucoda	11	7	0	579
192	Burbank	10	7	0	480
193	Ravensdale	9	7	0	404
194	Farmington	8	7	0	164
195	Black Diamond	8	7	0	100
196	Sekiu	7	7	0	94
197	Paterson	9	7	0	85
198	Copalis Beach	9	7	0	74
199	Los Altos	7	7	0	31
200	Mccleary	10	7	0	0
201	Fairchild Afb	10	7	2	0
202	Sunnyside	17	6	0	17,037
203	Edgewood	9	6	0	9,680
204	Chelan	7	6	0	9,425
205	Leavenworth	8	6	0	9,218
206	Toppenish	12	6	0	8,950
207	Fircrest	9	6	0	8,095
208	Manson	9	6	0	6,798
209	Wapato	14	6	0	5,962
210	Goldendale	9	6	0	4,314
211	White Salmon	6	6	0	3,930
212	Cle Elum	7	6	0	2,926
213	Desert Aire	6	6	0	2,835
214	Kittitas	8	6	0	2,247
215	La Conner	6	6	0	2,212
216	Lind	8	6	0	2,098
217	Davenport	10	6	0	1,720
218	Tieton	9	6	0	1,475
219	Point Roberts	6	6	0	1,440
220	Cusick	8	6	0	672
221	Orondo	7	6	0	292
222	19412 78th Se	7	6	0	250
223	Po Box 131	10	6	0	233
224	Metaline	6	6	0	193
225	Eltopia	12	6	0	100
226	Pomeroy	6	6	0	46
227	Eatonville	8	6	0	0
228	Pullman	14	5	0	29,690
229	Ellensburg	12	5	0	20,900
230	Othello	18	5	0	8,725
231	Colfax	9	5	0	3,624
232	Brewster	8	5	0	3,235
233	Chewelah	8	5	0	2,615
234	Asotin	5	5	0	2,531
235	Malaga	10	5	0	2,478
236	Mossyrock	11	5	0	1,553
237	Rosalia	8	5	0	831
238	Colton	8	5	0	617
239	Spangle	8	5	0	380
240	Uniontown	8	5	0	340
241	Sun Valley	11	5	0	315
242	Soap Lake	11	5	0	206
243	Benton City	10	5	0	124
244	Wentachee	11	5	0	78
245	Langley	5	5	0	71
246	Waitsburg	9	5	0	0
247	Loon Lake	12	4	0	7,484
248	Belfair	6	4	0	3,385
249	Tenino	5	4	0	3,336
250	Okanogan	5	4	0	3,072
251	Napavine	5	4	0	2,992
252	Rainier	9	4	0	2,758
253	Carnation	5	4	0	2,400
254	Toledo	4	4	0	1,944
255	Falls City	6	4	0	1,867
256	Sedro Woolley	7	4	0	1,733
257	Quincy	9	4	0	1,480
258	Lopez Island	8	4	0	1,180
259	Twisp	9	4	0	1,031
260	Coulee City	6	4	0	944
261	Washtucna	9	4	0	800
262	Garfield	8	4	0	694
263	11235 Hoh Mainline	5	4	0	500
264	Rockford	7	4	0	500
265	South Prairie	4	4	0	489
266	Endicott	5	4	0	488
267	Riverside	4	4	0	429
268	Greenwater	5	4	0	299
269	Marcus	6	4	0	191
270	Lake Tupps	4	4	0	175
271	Hamilton	4	4	0	41
272	Union Gap	5	4	0	0
273	Dayton	4	4	0	0
274	Montesano	4	3	0	5,087
275	Zillah	4	3	0	3,518
276	Rochester	3	3	0	1,762
277	Ritzville	8	3	0	1,725
278	Snoqualmie	3	3	0	1,603
279	Startup	6	3	0	643
280	Vantage	6	3	0	405
281	Elmer City	3	3	0	368
282	Northport	3	3	0	290
283	Lilliwaup	3	3	0	275
284	Peshastin	4	3	0	177
285	East Wentachee	8	3	0	131
286	Gold Bar	3	3	0	122
287	Harrah	6	3	0	0
288	Greenacres	6	2	0	21,220
289	Liberty Lake	3	2	0	11,485
290	Snoqualmie Pass	2	2	0	5,922
291	Oroville	4	2	0	3,256
292	Lake Forest Park	3	2	0	3,171
293	Winlock	2	2	0	2,912
294	Kettle Falls	2	2	0	2,698
295	Maple Falls	2	2	0	2,648
296	Darrington	4	2	0	2,246
297	Port Ludlow	2	2	0	623
298	Custer	2	2	0	540
299	Thorp	2	2	0	510
300	Greenbank	5	2	0	495
301	Winthrop	2	2	0	465
302	Springdale	4	2	0	315
303	Kahlotus	2	2	0	262
304	Elma	2	2	0	220
305	Elk	4	2	0	125
306	Satsop	2	2	0	113
307	Salkum	3	2	0	103
308	Dallesport	2	2	0	92
309	Concrete	2	2	0	81
310	Baring	2	2	0	53
311	Chattaroy	3	2	0	52
312	Morton	2	2	0	48
313	Tekoa	3	2	0	45
314	Methow	2	2	0	0
315	Creston	2	2	0	0
316	Almira	4	2	0	0
317	Oakville	2	2	0	0
318	Anderson Island	3	2	0	0
319	Des Moines	2	1	0	5,037
320	Glacier	1	1	0	2,383
321	Nooksack	1	1	0	2,107
322	Union	2	1	0	1,999
323	Sumas	1	1	0	1,740
324	Packwood	1	1	0	1,425
325	Hoodsport	1	1	0	917
326	Yacolt	3	1	0	705
327	Littlerock	1	1	0	639
328	Acme	2	1	0	568
329	Albion	4	1	0	555
330	Oakesdale	3	1	0	520
331	Stevenson	1	1	0	500
332	Index	2	1	0	406
333	Skykomish	2	1	0	324
334	Lake Stevens	1	1	0	308
335	Husum	2	1	0	302
336	Lacrosse	1	1	0	297
337	Tahuya	2	1	0	287
338	Reardan	2	1	0	182
339	Warden	4	1	0	159
340	Starbuck	1	1	0	147
341	Connell	1	1	0	120
342	Mount Vernon	1	1	0	51
343	Rockport	1	1	0	45
344	Blain	1	1	0	28
345	Beaver	1	1	0	0
346	Lamont	2	1	0	0
347	Marlin	1	1	0	0
348	Sprague	1	1	0	0
349	Quinault	1	1	0	0
350	Edwall	1	1	0	0
351	Airway Heights	3	1	0	0
352	Po Box 644	1	0	0	2,909
353	Pouslbo	0	0	0	1,229
354	Trout Lake	0	0	0	992
355	Beaux Arts	1	0	0	345
356	College Place	1	0	0	302
357	Willard	0	0	0	278
358	Prosser	1	0	0	162
359	Waverly	2	0	0	120
360	University Place	0	0	0	75
361	Grapeview	0	0	0	68
362	East Olympia	0	0	0	50
363	Carson	0	0	0	44
364	Allyn	0	0	0	42
365	Wauna	0	0	0	31
366	Seabeck	0	0	0	30
367	Curlew	0	0	0	29
368	Prescott	0	0	0	29
369	Deming	0	0	0	28
370	Forks	0	0	0	28
371	Dryden	0	0	0	26
372	Po Box 57	0	0	0	20
373	Granger	1	0	0	0
374	Randle	2	0	0	0

Recommended Filtration for Washington

Based on the most common contaminants found across Washington (Total trihalomethanes (TTHMs), Nitrate, Bromodichloromethane), we recommend a reverse osmosis system or high-quality carbon block filter to remove disinfection byproducts and their precursors.

Echo RO System

Removes up to 99.9% of contaminants. The gold standard for drinking water in Washington homes.

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Echo Whole-Home Filter

Protect every tap in your home from chlorine, VOCs, and disinfection byproducts.

View Whole-Home Filters

Echo Hydrogen Water Flask

Once your water is clean, supercharge it with molecular hydrogen for antioxidant and anti-inflammatory benefits.

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Frequently Asked Questions

Is Washington tap water safe to drink?

Water quality varies significantly across Washington. Of the 374 cities analyzed, the average city has 6.8 contaminants above EWG health guidelines. The best water quality was found in Po Box 644. We recommend checking your specific city's report for detailed information.

What city has the best water in Washington?

Based on our analysis, Po Box 644 has the fewest contaminants above EWG health guidelines in Washington, with 0 above guideline levels.

What city has the worst water in Washington?

Based on our analysis, West Richland has the most contaminants above EWG health guidelines in Washington, with 20 above guideline levels.

What's the best water filter for Washington residents?

For most Washington households, we recommend a reverse osmosis (RO) system for drinking water and a whole-home filter for showers and baths. The specific recommendation depends on your city's contaminant profile — check your city's report for personalized guidance.

National Water Quality Reports

Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)

Last updated: March 2026

Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.

Washington Water Quality Report (2026)