Wisconsin Tap Water Quality Report

583 cities analyzed • 3,526,183 people served

Updated March 2026 • Data from EWG & EPA SDWIS

583

Cities Analyzed

9.8

Avg Above Guidelines

3,526,183

Total Population Served

Best Water Quality

Washburn (0 above guidelines)

Most Concerns

Marshfield (24 above guidelines)

Most Common Contaminants in Wisconsin

Contaminant	Found In	% of Cities
Barium	490 of 583	84%
Fluoride	482 of 583	83%
Total trihalomethanes (TTHMs) carcinogen	445 of 583	76%
Chloroform carcinogen	444 of 583	76%
Bromodichloromethane carcinogen	434 of 583	74%
Haloacetic acids (HAA5) carcinogen	434 of 583	74%
Nitrate carcinogen	420 of 583	72%
Dichloroacetic acid carcinogen	409 of 583	70%
Dibromochloromethane carcinogen	408 of 583	70%
Nitrate and nitrite carcinogen	402 of 583	69%

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	Marshfield	39	24	1	18,708
2	Weston	37	21	0	15,045
3	Madison	54	20	0	235,000
4	La Crosse	44	20	0	53,000
5	Manitowoc	35	20	0	34,500
6	Bellevue	35	20	0	0
7	Saukville	32	19	2	4,465
8	Racine	32	18	0	105,100
9	Green Bay	36	18	0	104,057
10	Waukesha	34	18	0	70,718
11	Oshkosh	32	18	0	63,000
12	Wausau	30	18	0	39,106
13	Oak Creek	33	18	0	32,104
14	Onalaska	34	18	0	18,000
15	Marinette	30	18	0	10,968
16	Pewaukee	31	18	1	8,671
17	Rhinelander	30	18	0	7,427
18	New London	27	18	0	7,187
19	Waterford	30	18	0	5,368
20	Hobart	37	18	0	3,162
21	New Franken	36	18	0	1,875
22	Stratford	27	18	0	1,651
23	Thorp	27	18	0	1,636
24	Iola	24	18	0	1,300
25	Manawa	32	18	0	1,300
26	Bristol	35	18	0	1,001
27	Plainfield	28	18	0	862
28	Kenosha	33	17	0	99,218
29	Janesville	29	17	0	62,720
30	Franklin	35	17	0	22,500
31	South Milwaukee	33	17	0	21,340
32	Wisconsin Rapids	28	17	0	20,000
33	Cudahy	30	17	0	18,659
34	Middleton	32	17	0	17,903
35	Hudson	38	17	0	17,100
36	Oconomowoc	32	17	0	15,805
37	Plover	30	17	0	12,420
38	Cedarburg	37	17	0	11,900
39	Port Washington	32	17	0	11,762
40	Grafton	36	17	0	11,745
41	Two Rivers	35	17	0	11,232
42	Pleasant Prairie	33	17	0	10,754
43	Portage	31	17	0	10,300
44	Mukwonago	25	17	1	7,375
45	Ripon	24	17	0	7,241
46	Rothschild	24	17	2	3,190
47	Somers	33	17	0	1,930
48	Fall Creek	29	17	0	1,322
49	Loyal	25	17	0	1,308
50	Wittenberg	26	17	0	1,200
51	Green Lake	26	17	1	960
52	Friendship	26	17	2	781
53	Granton	27	17	0	349
54	Colby	22	17	0	0
55	Milwaukee	27	16	0	647,290
56	Eau Claire	29	16	2	66,060
57	West Allis	29	16	0	63,240
58	Wauwatosa	29	16	0	49,064
59	New Berlin	29	16	0	27,899
60	Neenah	33	16	0	25,892
61	Stevens Point	29	16	0	24,551
62	Menomonee Falls	29	16	0	23,867
63	Hartford	27	16	0	15,384
64	Whitefish Bay	31	16	0	14,272
65	Greendale	34	16	0	14,046
66	Shorewood	28	16	0	13,189
67	Glendale	31	16	0	12,883
68	Brown Deer	30	16	0	12,741
69	Stoughton	29	16	0	12,698
70	Shawano	28	16	0	8,330
71	Monona	23	16	0	7,533
72	Waupaca	25	16	0	6,062
73	Boscobel	23	16	0	3,419
74	Schofield	26	16	0	2,117
75	Butler	28	16	0	1,881
76	Muscoda	28	16	0	1,453
77	Valders	23	16	1	958
78	Ridgeway	24	16	0	690
79	Camp Douglas	24	16	0	640
80	Prairie Du Chien	26	16	0	300
81	Seneca	25	16	0	250
82	Florence	19	16	0	0
83	Adams	26	16	2	0
84	Menasha	28	15	0	72,000
85	Sheboygan	25	15	0	49,288
86	Beloit	33	15	0	37,110
87	West Bend	32	15	1	31,500
88	Brookfield	39	15	0	29,070
89	Grand Chute	30	15	0	21,583
90	Chippewa Falls	26	15	0	13,375
91	Baraboo	26	15	0	12,048
92	Verona	23	15	0	10,619
93	Sturgeon Bay	23	15	0	9,500
94	Hartland	29	15	0	9,212
95	Antigo	22	15	0	8,234
96	Sheboygan Falls	27	15	0	7,837
97	Lake Geneva	24	15	0	7,107
98	Slinger	27	15	0	4,569
99	Sherwood	29	15	0	3,114
100	Walworth	23	15	1	2,304
101	Kohler	26	15	0	2,114
102	North Prairie	19	15	1	2,100
103	Abbotsford	23	15	0	1,956
104	Palmyra	22	15	0	1,774
105	Osseo	25	15	0	1,701
106	Marathon City	22	15	0	1,695
107	Dorchester	22	15	0	834
108	Birnamwood	22	15	0	832
109	Sheldon	27	15	0	265
110	Lannon	26	15	0	72
111	Avoca	25	15	0	0
112	Kiel	26	15	0	0
113	Superior	24	14	0	29,571
114	Watertown	23	14	0	23,127
115	Whitewater	25	14	0	14,000
116	Fox Point	26	14	0	6,808
117	Kronenwetter	18	14	0	6,080
118	Berlin	18	14	0	5,371
119	Medford	26	14	0	4,318
120	Omro	23	14	0	3,558
121	Stanley	24	14	0	3,500
122	Waterloo	19	14	0	3,311
123	Lake Delton	27	14	0	2,914
124	Neillsville	22	14	0	2,761
125	Black River Falls	20	14	1	2,692
126	Wautoma	25	14	0	2,110
127	Marion	20	14	0	1,293
128	King	25	14	0	1,240
129	Luck	24	14	0	1,150
130	Pittsville	21	14	0	838
131	Tigerton	21	14	0	756
132	Wausaukee	28	14	0	573
133	Hatley	19	14	0	385
134	Bowler	20	14	0	302
135	New Lisbon	21	14	0	0
136	Gresham	18	14	0	0
137	Woodville	29	14	0	0
138	Amherst	24	14	0	0
139	Cross Plains	24	14	0	0
140	Luxemburg	19	14	0	0
141	Edgar	23	14	0	0
142	Germantown	33	13	0	20,027
143	Waunakee	26	13	0	13,322
144	Tomah	30	13	0	9,192
145	Altoona	31	13	0	7,345
146	Clintonville	17	13	0	4,635
147	Mosinee	21	13	0	3,208
148	Brillion	18	13	0	3,148
149	Wisconsin Dells	28	13	0	2,678
150	Lomira	24	13	0	2,461
151	Cuba City	23	13	0	2,141
152	St Croix Falls	21	13	0	2,079
153	Eagle	22	13	1	1,950
154	Phillips	20	13	0	1,675
155	West Baraboo	18	13	0	1,414
156	Hillsboro	19	13	0	1,325
157	Sister Bay	17	13	0	1,000
158	Benton	22	13	0	976
159	Owen	19	13	0	936
160	Necedah	21	13	0	844
161	Whitelaw	17	13	0	757
162	Hancock	21	13	0	462
163	Richfield	19	13	0	47
164	Ellsworth	24	13	0	0
165	Bonduel	18	13	0	0
166	Crivitz	20	13	0	0
167	Barneveld	22	13	0	0
168	Mount Horeb	26	13	0	0
169	Arlington	25	13	0	0
170	Genoa City	22	13	0	0
171	Mount Calvary	15	13	0	0
172	Deforest	25	13	0	0
173	Sun Prairie	27	12	0	32,613
174	Fitchburg	24	12	0	15,000
175	Platteville	22	12	0	12,268
176	Fort Atkinson	21	12	0	12,125
177	Monroe	22	12	0	10,780
178	Merrill	18	12	0	9,661
179	Reedsburg	24	12	0	9,548
180	Plymouth	17	12	0	8,477
181	Jefferson	16	12	0	7,926
182	North Fond Du Lac	18	12	0	5,014
183	Chilton	16	12	0	3,933
184	Fort Mccoy	20	12	0	3,000
185	Mineral Point	17	12	0	2,487
186	Fredonia	20	12	0	2,191
187	Clinton	17	12	0	2,119
188	Weyauwega	16	12	0	1,856
189	Augusta	19	12	0	1,450
190	Reedsville	18	12	0	1,200
191	Centuria	18	12	0	900
192	Lone Rock	18	12	0	895
193	Elmwood	19	12	0	815
194	Stoddard	21	12	0	793
195	Wyocena	22	12	0	768
196	Mercer	16	12	0	760
197	New Auburn	22	12	0	549
198	St Cloud	18	12	0	494
199	Kendall	18	12	0	479
200	Mattoon	14	12	0	450
201	Hixton	16	12	0	443
202	Maribel	19	12	0	400
203	Powers Lake	18	12	2	400
204	Kellnersville	17	12	0	400
205	Cazenovia	18	12	0	351
206	Milladore	15	12	0	277
207	Spooner	20	12	0	200
208	Maplewood	22	12	0	122
209	Clayton	16	12	0	0
210	Glenwood City	19	12	0	0
211	Gillett	18	12	0	0
212	Embarrass	14	12	0	0
213	Lyndon Station	20	12	0	0
214	Niagara	16	12	0	0
215	Athens	21	12	0	0
216	Irma	15	12	0	0
217	Chaseburg	18	12	0	0
218	Blair	21	12	0	0
219	Cornell	20	12	0	0
220	Jackson	16	12	0	0
221	Fond Du Lac	27	11	0	42,000
222	Caledonia	19	11	0	21,819
223	Menomonie	25	11	0	15,950
224	Kaukauna	22	11	0	13,430
225	Waupun	16	11	0	11,340
226	Little Chute	25	11	0	11,040
227	Sussex	21	11	0	10,573
228	Ashland	20	11	0	9,115
229	New Richmond	17	11	0	8,909
230	Muskego	17	11	0	8,150
231	Oostburg	14	11	0	2,942
232	Wrightstown	20	11	0	2,830
233	Hortonville	17	11	0	2,720
234	Hayward	17	11	0	2,340
235	Pardeeville	20	11	0	2,117
236	Redgranite	14	11	0	2,019
237	Campbellsport	21	11	0	2,016
238	Spencer	18	11	0	1,941
239	Randolph	16	11	0	1,800
240	Orfordville	18	11	0	1,475
241	Theresa	19	11	0	1,262
242	Monticello	17	11	0	1,167
243	Greenwood	15	11	0	1,079
244	Almena	16	11	0	677
245	Prentice	18	11	0	660
246	Minong	15	11	0	561
247	Cochrane	15	11	0	450
248	Bear Creek	16	11	0	418
249	Butternut	18	11	0	397
250	Nelson	17	11	0	375
251	Fifield	16	11	0	300
252	Rewey	14	11	0	290
253	Hustler	14	11	0	170
254	Wonewoc	18	11	0	0
255	Amery	17	11	0	0
256	Coleman	17	11	0	0
257	Bagley	16	11	0	0
258	Blanchardville	18	11	0	0
259	Belleville	16	11	0	0
260	Denmark	18	11	0	0
261	Darlington	17	11	0	0
262	Kewaunee	21	11	1	0
263	Argyle	21	11	0	0
264	Cobb	17	11	0	0
265	Junction City	19	11	0	0
266	Phelps	18	11	0	0
267	Iron Ridge	14	11	0	0
268	Adell	20	11	0	0
269	Cleveland	17	11	0	0
270	Viroqua	19	11	0	0
271	Beaver Dam	18	10	0	16,200
272	River Falls	18	10	0	15,229
273	Appleton	19	10	0	12,000
274	Elkhorn	17	10	1	8,820
275	Kimberly	18	10	0	6,451
276	Suamico	17	10	0	5,968
277	Lake Mills	14	10	0	5,780
278	Milton	13	10	0	5,588
279	Peshtigo	15	10	0	3,449
280	Sauk City	16	10	0	3,424
281	Freedom	16	10	0	3,000
282	Nekoosa	20	10	0	2,775
283	Mondovi	15	10	0	2,667
284	Fennimore	18	10	0	2,507
285	New Glarus	20	10	0	2,172
286	Oxford	15	10	0	1,550
287	Sharon	15	10	0	1,549
288	Grantsburg	14	10	0	1,460
289	Mishicot	16	10	0	1,422
290	Shullsburg	20	10	0	1,222
291	Windsor	16	10	0	1,200
292	Dickeyville	26	10	0	1,069
293	Laona	14	10	0	950
294	St Nazianz	15	10	0	783
295	Mellen	14	10	0	731
296	Stockbridge	14	10	0	650
297	Vesper	14	10	0	641
298	Burlington	14	10	0	500
299	Waldo	16	10	0	452
300	Eastman	17	10	0	427
301	Fairwater	15	10	0	365
302	Rock Springs	13	10	0	362
303	Lowell	14	10	0	337
304	Leroy	16	10	0	320
305	Oakdale	15	10	0	317
306	Warrens	14	10	0	315
307	Curtiss	14	10	0	216
308	Maiden Rock	15	10	0	118
309	Edmund	16	10	0	110
310	Combined Locks	18	10	0	0
311	Greenleaf	13	10	0	0
312	Brandon	18	10	0	0
313	Wauzeka	18	10	0	0
314	Independence	16	10	0	0
315	Hurley	13	10	0	0
316	Fontana	17	10	0	0
317	Cashton	16	10	0	0
318	Cadott	15	10	0	0
319	Hustisford	20	10	0	0
320	Bangor	17	10	0	0
321	Readstown	16	10	0	0
322	Belgium	16	10	0	0
323	Coon Valley	18	10	0	0
324	Boyceville	16	10	0	0
325	Cedar Grove	18	10	0	0
326	Pulaski	15	9	0	3,600
327	Seymour	13	9	0	3,478
328	Brodhead	16	9	0	3,216
329	Park Falls	15	9	0	2,993
330	Oconto Falls	13	9	0	2,892
331	Poynette	16	9	0	2,520
332	Minocqua	20	9	0	2,381
333	Winneconne	16	9	0	2,377
334	Lodi	12	9	0	1,950
335	Whitehall	15	9	0	1,820
336	Darien	16	9	0	1,643
337	Random Lake	11	9	0	1,576
338	Fox Lake	15	9	0	1,512
339	Markesan	14	9	0	1,496
340	Montello	16	9	0	1,329
341	Hazel Green	19	9	0	1,256
342	Hilbert	15	9	0	1,176
343	Turtle Lake	12	9	0	1,073
344	Shiocton	17	9	0	921
345	Elk Mound	15	9	0	876
346	Potosi	17	9	0	718
347	Viola	12	9	0	667
348	Livingston	13	9	0	664
349	Rockland	14	9	0	642
350	Lena	15	9	0	585
351	Fairchild	13	9	0	564
352	Stetsonville	15	9	0	563
353	Taylor	13	9	0	498
354	Withee	13	9	0	480
355	Pigeon Falls	14	9	0	411
356	Pound	16	9	0	377
357	Browntown	13	9	0	256
358	Downsville	13	9	0	250
359	Union Center	11	9	0	214
360	Westboro	13	9	0	150
361	Yuba	12	9	0	53
362	Marathon	15	9	1	50
363	Black Creek	14	9	0	0
364	Loganville	16	9	0	0
365	Goodman	18	9	0	0
366	Blue River	15	9	0	0
367	Black Earth	13	9	0	0
368	Arcadia	21	9	0	0
369	Spring Valley	17	9	0	0
370	Blue Mounds	16	9	0	0
371	Mc Farland	19	9	0	0
372	Ettrick	16	9	0	0
373	Little Suamico	17	9	0	0
374	La Farge	16	9	0	0
375	Boyd	15	9	0	0
376	Glidden	14	9	0	0
377	Juneau	16	9	0	0
378	Oakfield	12	9	0	0
379	Melrose	16	9	0	0
380	Trempealeau	17	9	0	0
381	Allenton	13	9	0	0
382	Mequon	10	8	0	11,152
383	Sparta	14	8	0	9,522
384	Pell Lake	15	8	0	4,071
385	Lancaster	14	8	0	3,868
386	Osceola	12	8	0	2,680
387	Cambridge	16	8	0	1,247
388	Strum	12	8	0	1,100
389	Rio	12	8	0	1,058
390	Balsam Lake	13	8	0	1,031
391	Pepin	20	8	0	940
392	Bruce	16	8	0	766
393	Montfort	19	8	0	718
394	Norwalk	15	8	0	653
395	Soldiers Grove	16	8	0	592
396	Suring	10	8	0	559
397	Merrillan	19	8	0	531
398	Sextonville	11	8	0	325
399	Haugen	12	8	0	287
400	Weyerhauser	13	8	0	238
401	Patch Grove	13	8	0	160
402	Auburndale	12	8	0	100
403	Mazomanie	11	8	0	85
404	Dunbar	12	8	2	0
405	Tony	14	8	2	0
406	Gratiot	10	8	0	0
407	Ontario	16	8	0	0
408	Iron Belt	11	8	0	0
409	Alma Center	19	8	0	0
410	Cascade	12	8	0	0
411	Elkhart Lake	12	8	0	0
412	Clyman	15	8	0	0
413	Brownsville	16	8	0	0
414	Oregon	15	7	0	9,797
415	Mayville	17	7	0	5,061
416	Oconto	11	7	0	4,740
417	Ladysmith	13	7	0	3,184
418	Williams Bay	11	7	0	2,601
419	Montreal	12	7	0	887
420	Iron River	13	7	0	600
421	Linden	16	7	0	547
422	Wilton	12	7	0	503
423	Town Of Holland	17	7	0	495
424	Morrisonville	12	7	0	400
425	Delavan	16	7	0	400
426	Hales Corners	12	7	2	400
427	White Lake	12	7	0	351
428	Forest Junction	20	7	0	320
429	Friesland	13	7	0	311
430	Trevor	13	7	0	300
431	La Valle	12	7	0	253
432	Pence	12	7	0	191
433	Elroy	14	7	0	0
434	Cambria	17	7	0	0
435	Belmont	17	7	0	0
436	Albany	10	7	0	0
437	Alma	16	7	0	0
438	Eleva	9	7	0	0
439	Kewaskum	15	7	1	0
440	Gilman	12	7	0	0
441	Westby	13	7	0	0
442	Tomahawk	14	6	1	3,770
443	Princeton	8	6	0	1,250
444	Paddock Lake	10	6	0	945
445	Milltown	12	6	0	915
446	Kieler	13	6	0	500
447	Bayfield	10	6	0	488
448	Elcho	11	6	0	400
449	Spring Green	13	6	0	300
450	Danbury	9	6	0	286
451	Nichols	12	6	0	254
452	Prescott	10	6	0	175
453	South Wayne	12	6	0	98
454	Cedaredge	10	6	0	35
455	Unity	14	6	0	32
456	Cottage Grove	9	6	0	0
457	Glenbeulah	11	6	0	0
458	Edgerton	10	5	0	5,512
459	Evansville	9	5	0	5,070
460	Crandon	9	5	0	1,958
461	Hammond	10	5	0	1,922
462	Siren	8	5	0	941
463	Highland	12	5	0	842
464	Coloma	11	5	0	454
465	Nashotah	10	5	0	450
466	Dodge	6	5	0	266
467	Mount Hope	10	5	0	181
468	Hawkins	10	5	0	120
469	Durand	8	5	0	60
470	Wi Dells	7	5	0	60
471	Wabeno	8	5	0	0
472	Marshall	13	5	0	0
473	Glen Flora	9	5	0	0
474	Rice Lake	12	4	0	8,300
475	Barron	9	4	0	3,423
476	Cumberland	8	4	0	2,311
477	Fall River	11	4	0	1,712
478	Frederic	8	4	0	1,241
479	Dresser	9	4	0	897
480	Footville	11	4	0	805
481	Sinsinawa	14	4	0	482
482	Delafield	8	4	0	320
483	Wheeler	8	4	0	317
484	Radisson	10	4	0	241
485	Genoa	9	4	0	180
486	Galesville	9	4	0	120
487	Buffalo City	8	4	1	90
488	Wild Rose	5	4	0	60
489	Horicon	6	4	0	46
490	Ellison Bay	6	4	0	0
491	Clear Lake	8	4	0	0
492	Roberts	10	4	0	0
493	Star Prairie	7	4	0	0
494	Wilson	9	4	0	0
495	Chetek	8	4	0	0
496	Richland Center	10	3	0	5,100
497	Port Edwards	5	3	0	1,866
498	Dousman	9	3	0	1,716
499	Shell Lake	8	3	0	950
500	Rib Lake	8	3	0	945
501	Reeseville	10	3	0	707
502	Bloomington	7	3	0	682
503	Three Lakes	12	3	0	500
504	Eden	4	3	0	400
505	Exeland	5	3	0	260
506	Drummond	7	3	0	250
507	Mauston	6	3	0	210
508	Plum City	4	3	0	120
509	Holmen	5	3	0	117
510	New Holstein	4	3	0	98
511	Bancroft	9	3	0	75
512	Eagle River	7	3	0	75
513	Winchester	4	3	0	70
514	Bloomer	4	3	0	64
515	Prairie Du Sac	5	3	0	60
516	Comstock	4	3	0	54
517	Mecan Tn	6	3	0	25
518	Baileys Harbor	6	3	0	0
519	Mount Sterling	8	3	0	0
520	De Pere	5	2	0	23,920
521	Cameron	5	2	0	1,787
522	Webster	8	2	0	652
523	Sullivan	4	2	0	525
524	Knapp	6	2	0	472
525	Birchwood	5	2	0	442
526	Elm Grove	5	2	0	410
527	Port Wing	6	2	0	400
528	Dallas	4	2	0	365
529	Winter	8	2	0	344
530	West Salem	7	2	0	240
531	Troy Center	4	2	0	170
532	Thiensville	7	2	0	130
533	Arbor Vitae	6	2	0	90
534	Somerset	7	2	0	75
535	Ixonia	5	2	0	64
536	Arena	2	2	0	49
537	Cassville	4	2	0	40
538	Westfield	4	2	0	39
539	Doylestown	2	2	0	0
540	Egg Harbor	6	2	0	0
541	Dane	5	2	0	0
542	Brooklyn	6	2	0	0
543	Baldwin	8	2	0	0
544	Gordon	5	2	0	0
545	Gays Mills	7	2	0	0
546	Greenville	4	1	0	7,955
547	Columbus	3	1	0	5,036
548	Union Grove	5	1	0	4,900
549	North Freedom	3	1	0	450
550	Twin Lakes	4	1	0	325
551	Hollandale	8	1	0	283
552	Mindoro	3	1	0	275
553	Sturtevant	2	1	0	220
554	Wales	7	1	0	199
555	Salem	3	1	0	150
556	Stitzer	5	1	0	150
557	Lake Tomahawk	1	1	0	110
558	Silver Lake	6	1	0	80
559	Merrimac	6	1	0	70
560	Algoma	6	1	0	66
561	Deerfield	2	1	0	65
562	Fountain City	4	1	0	50
563	Okauchee	6	1	0	49
564	Dodgeville	6	1	0	40
565	East Troy	6	1	0	40
566	Rochester	5	1	0	38
567	Johnson Creek	2	1	0	30
568	Abrams	1	1	0	0
569	Arpin	2	1	0	0
570	Houlton	7	1	0	0
571	Washburn	5	0	0	2,280
572	Bayside	0	0	0	225
573	Kansasville	2	0	0	200
574	Stone Lake	0	0	0	175
575	Land O Lakes	0	0	0	120
576	Colfax	0	0	0	90
577	Los Angeles	0	0	0	80
578	Durango	0	0	0	55
579	Marengo	0	0	0	50
580	Plain	0	0	0	30
581	Bay City	0	0	0	30
582	Libertyville	0	0	0	30
583	South Range	1	0	0	0

Recommended Filtration for Wisconsin

Based on the most common contaminants found across Wisconsin (Barium, Fluoride, Total trihalomethanes (TTHMs)), 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 Wisconsin homes.

View RO Systems

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.

Shop Hydrogen Flask

Frequently Asked Questions

Is Wisconsin tap water safe to drink?

Water quality varies significantly across Wisconsin. Of the 583 cities analyzed, the average city has 9.8 contaminants above EWG health guidelines. The best water quality was found in Washburn. We recommend checking your specific city's report for detailed information.

What city has the best water in Wisconsin?

Based on our analysis, Washburn has the fewest contaminants above EWG health guidelines in Wisconsin, with 0 above guideline levels.

What city has the worst water in Wisconsin?

Based on our analysis, Marshfield has the most contaminants above EWG health guidelines in Wisconsin, with 24 above guideline levels.

What's the best water filter for Wisconsin residents?

For most Wisconsin 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.

Wisconsin Water Quality Report (2026)