Illinois Tap Water Quality Report

1074 cities analyzed • 10,811,305 people served

Updated March 2026 • Data from EWG & EPA SDWIS

1074

Cities Analyzed

10.0

Avg Above Guidelines

10,811,305

Total Population Served

Best Water Quality

St. Petersburg (0 above guidelines)

Most Concerns

Hanna City (19 above guidelines)

Most Common Contaminants in Illinois

Contaminant	Found In	% of Cities
Total trihalomethanes (TTHMs) carcinogen	1019 of 1074	95%
Haloacetic acids (HAA5) carcinogen	994 of 1074	93%
Chloroform carcinogen	969 of 1074	90%
Dichloroacetic acid carcinogen	921 of 1074	86%
Bromodichloromethane carcinogen	915 of 1074	85%
Dibromochloromethane carcinogen	855 of 1074	80%
Trichloroacetic acid carcinogen	800 of 1074	74%
Dibromoacetic acid	693 of 1074	65%
Fluoride	589 of 1074	55%
Barium	579 of 1074	54%

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	Machesney Park	31	19	2	35,580
2	Dunlap	42	19	0	1,603
3	Hanna City	41	19	0	1,253
4	Peoria	41	18	0	121,478
5	East Peoria	32	18	0	22,284
6	Glasford	42	18	0	2,665
7	Aurora	33	17	0	200,000
8	Belleville	31	17	0	139,879
9	O'fallon	31	17	0	46,603
10	South Elgin	38	17	0	22,549
11	Caseyville	32	17	0	17,000
12	Cahokia Heights	31	17	0	15,250
13	Columbia	31	17	0	11,638
14	Waterloo	31	17	0	10,190
15	Scott Air Force Base	32	17	0	6,779
16	Swansea	31	17	0	4,474
17	East St. Louis	31	17	0	450
18	Rockford	38	16	0	147,051
19	Elgin	36	16	0	113,911
20	Galesburg	27	16	1	31,745
21	Freeport	25	16	1	23,930
22	Jerseyville	32	16	0	12,750
23	Oneida	27	16	2	3,460
24	Knoxville	27	16	1	3,120
25	Sleepy Hollow	36	16	0	3,100
26	Pekin	34	16	0	1,635
27	Germantown	24	16	0	1,531
28	East Galesburg	28	16	1	860
29	Henderson	27	16	1	375
30	Little York	27	16	1	304
31	Chapin	26	16	0	0
32	Evanston	23	15	0	75,570
33	Skokie	25	15	0	62,700
34	Alton	30	15	0	46,127
35	Quincy	29	15	0	45,000
36	Northbrook	26	15	0	34,407
37	Collinsville	29	15	1	29,500
38	Belvidere	31	15	0	25,070
39	Zion	26	15	0	24,413
40	Lockport	35	15	0	19,887
41	Taylorville	24	15	0	16,396
42	Wauconda	24	15	0	14,084
43	Minooka	30	15	0	12,800
44	Lincolonwood	24	15	0	12,394
45	Wood River	27	15	1	10,464
46	Peoria Heights	22	15	0	5,908
47	Northfield	23	15	0	5,470
48	Brighton	30	15	0	5,041
49	Vernon Hills	26	15	0	3,595
50	Edinburg	24	15	0	1,727
51	Provo	32	15	0	1,468
52	Patoka	22	15	0	603
53	Langleyville	24	15	0	425
54	West Union	20	15	0	0
55	Springfield	24	14	0	117,428
56	Waukegan	24	14	0	87,157
57	Bloomington	24	14	0	77,610
58	Romeoville	31	14	0	50,244
59	Rock Island	29	14	0	39,018
60	Libertyville	24	14	0	34,617
61	Mundelein	23	14	0	31,500
62	Gurnee	24	14	0	30,706
63	Algonquin	26	14	0	29,700
64	Round Lake Beach	23	14	0	28,845
65	Edwardsville	24	14	0	26,808
66	Grayslake	24	14	0	21,248
67	Crest Hill	37	14	0	21,169
68	Round Lake	23	14	0	18,278
69	Marion	26	14	0	16,855
70	North Chicago	22	14	0	16,813
71	Chatham	24	14	0	16,544
72	Charleston	24	14	0	16,400
73	Mt. Vernon	25	14	0	15,793
74	Macomb	25	14	0	15,052
75	Lindenhurst	23	14	0	14,467
76	Robinson	20	14	0	11,331
77	Beach Park	24	14	0	8,616
78	Lincolnshire	23	14	0	7,275
79	Pocahontas	29	14	0	6,838
80	Fairfield	20	14	0	6,202
81	Williamsville	24	14	0	6,091
82	Flora	21	14	0	5,478
83	Park City	24	14	0	5,425
84	Granite City	29	14	0	4,787
85	Byron	19	14	0	4,743
86	New Baden	21	14	0	4,178
87	Westville	23	14	0	3,791
88	Rochester	24	14	0	3,689
89	Odin	21	14	0	2,836
90	Kenilworth	23	14	0	2,514
91	St Rose	22	14	0	2,135
92	Catlin	23	14	0	2,087
93	Hudson	24	14	0	1,847
94	Green Oaks	24	14	0	1,470
95	Morrisonville	15	14	1	1,068
96	Clay City	28	14	0	1,059
97	Raymond	19	14	0	974
98	Fort Lauderdale	26	14	0	912
99	St David	29	14	0	850
100	Loami	25	14	0	812
101	Farina	21	14	0	550
102	Xenia	21	14	0	545
103	Towanda	24	14	0	480
104	Erlanger	25	14	0	464
105	Speld	24	14	0	358
106	Ste. Marie	28	14	0	243
107	Spfld	24	14	0	220
108	Indianola	24	14	0	176
109	La Verne	24	14	0	154
110	Englewood	25	14	0	148
111	St Louis	25	14	0	120
112	Oviedo	24	14	0	92
113	Eldred	19	14	0	0
114	Bardolph	25	14	0	0
115	West Salem	28	14	0	0
116	Hutsonville	20	14	0	0
117	Annapolis	20	14	0	0
118	Kinmundy	21	14	0	0
119	Chicago	20	13	0	2,746,388
120	Cicero	24	13	0	83,000
121	Kankakee	27	13	0	80,275
122	Des Plaines	23	13	0	60,675
123	Berwyn	23	13	0	58,000
124	Oak Lawn	25	13	0	55,022
125	Oak Park	25	13	0	54,583
126	Glenview	25	13	0	47,856
127	Moline	28	13	0	44,500
128	Crystal Lake	27	13	0	40,635
129	Park Ridge	23	13	0	37,457
130	St. Charles	27	13	0	33,103
131	Burbank	22	13	0	30,000
132	Highland Park	22	13	0	29,763
133	Lake In The Hills	25	13	0	29,228
134	Wilmette	22	13	0	27,087
135	West Chicago	22	13	0	25,166
136	Elmwood Park	23	13	0	25,000
137	Harvey	23	13	0	25,000
138	Melrose Park	24	13	0	24,206
139	Dieterich	28	13	0	23,944
140	Blue Island	25	13	0	23,463
141	Great Lakes	22	13	0	23,000
142	Park Forest	19	13	0	21,975
143	Dolton	23	13	0	21,426
144	East Moline	29	13	0	20,645
145	Evergreen Park	23	13	0	19,943
146	Mattoon	24	13	0	19,500
147	Jacksonville	23	13	0	19,446
148	Lake Forest	23	13	0	19,367
149	Deerfield	23	13	0	19,196
150	Bethalto	22	13	0	19,121
151	Alsip	25	13	0	18,880
152	Justice	25	13	0	18,457
153	Franklin Park	23	13	0	18,333
154	Troy	22	13	0	16,800
155	Bridgeview	25	13	0	16,446
156	Canton	29	13	0	14,700
157	Forest Park	24	13	0	14,339
158	Norridge	24	13	0	14,281
159	Riverdale	22	13	0	13,549
160	Glen Carbon	30	13	0	12,943
161	Herrin	24	13	0	12,872
162	Plano	21	13	0	12,191
163	Centralia	22	13	0	12,182
164	Ingleside	18	13	0	11,780
165	Schiller Park	23	13	0	11,515
166	River Forest	24	13	0	11,172
167	Worth	24	13	0	10,970
168	Summit	24	13	0	10,875
169	River Grove	24	13	0	10,093
170	La Salle	20	13	0	9,700
171	Hardwood Heights	23	13	0	9,065
172	Glencoe	16	13	0	8,849
173	Mascoutah	25	13	0	8,754
174	Calunet Park	22	13	0	8,442
175	Benton	22	13	0	8,398
176	Marengo	17	13	0	7,572
177	Sandwich	20	13	0	7,421
178	Mt Carmel	16	13	0	7,284
179	Stickney	23	13	0	7,110
180	Winthrop Harbor	20	13	0	6,700
181	Hamilton	18	13	0	6,125
182	Wilmington	21	13	0	5,624
183	Robbins	24	13	0	5,415
184	Lebanon	21	13	0	4,418
185	Hometown	22	13	0	4,339
186	Sparta	21	13	0	4,200
187	Rosemont	22	13	0	4,200
188	Trenton	21	13	0	4,025
189	Momence	19	13	0	3,180
190	Menard	20	13	0	2,920
191	Rushville	17	13	0	2,398
192	Duquoin	24	13	0	2,328
193	Colchester	18	13	0	2,296
194	Richmond	19	13	0	2,087
195	Merrionette Park	22	13	0	1,969
196	Hampton	29	13	0	1,863
197	Sandoval	22	13	0	1,528
198	Garden Homes	23	13	0	1,472
199	Murrayville	23	13	0	1,403
200	Louisville	28	13	0	1,201
201	Sumner	16	13	0	1,093
202	Bannockburn	22	13	0	1,013
203	Roseville	18	13	0	989
204	Dallas City	18	13	0	945
205	Crofton	21	13	0	855
206	Farmersville	15	13	0	816
207	Techny	23	13	0	809
208	New Memphis	21	13	0	800
209	Findlay	28	13	0	800
210	Franklin	23	13	0	800
211	Forest View	21	13	0	800
212	Moro	22	13	0	723
213	Tower Hill	28	13	0	650
214	Cisne	15	13	0	634
215	Bedford Park	21	13	0	602
216	Dorchester	22	13	0	562
217	Mark	19	13	0	555
218	Mt. Auburn	17	13	1	480
219	Summerfield	21	13	0	471
220	London Mills	21	13	0	400
221	Norwood Park Township	23	13	0	312
222	Mccook	20	13	0	275
223	Vermilion	16	13	0	250
224	Norris	29	13	0	200
225	Smithboro	19	13	0	200
226	Raritan	18	13	0	180
227	Dwight	21	13	0	174
228	Media	18	13	0	132
229	Beckemeyer	20	13	0	0
230	White Hall	18	13	0	0
231	Augusta	16	13	0	0
232	Chester	20	13	0	0
233	Ellis Grove	20	13	0	0
234	Littleton	16	13	0	0
235	Humboldt	24	13	0	0
236	Hoffman	22	13	0	0
237	Greenville	19	13	0	0
238	Mulberry Grove	21	13	0	0
239	Biggsville	18	13	0	0
240	Carthage	22	13	0	0
241	Paloma	15	13	0	0
242	Edgewood	28	13	0	0
243	Toledo	15	13	0	0
244	Jewett	15	13	0	0
245	Concord	17	13	0	0
246	Waverly	24	13	0	0
247	Mazon	16	13	0	0
248	Hebron	17	13	0	0
249	Urbana	20	12	0	142,250
250	Decatur	26	12	0	76,122
251	Normal	24	12	0	45,841
252	Carpentersville	18	12	0	37,983
253	Loves Park	23	12	0	24,000
254	Yorkville	20	12	0	23,000
255	Mchenry	24	12	0	22,335
256	Frankfort	24	12	0	20,296
257	Mokena	22	12	1	19,887
258	Sycamore	21	12	0	18,500
259	Cary	28	12	0	18,271
260	Western Springs	20	12	0	13,274
261	Champaign	22	12	0	13,000
262	Murphysboro	23	12	0	10,740
263	West Frankfort	18	12	0	9,475
264	Lake Villa	18	12	0	8,829
265	Rock Falls	16	12	0	8,620
266	Volo	17	12	0	6,629
267	Carterville	23	12	0	6,484
268	Mount Zion	26	12	0	5,833
269	Lake Bluff	16	12	0	5,722
270	Watseka	17	12	0	5,500
271	Petersburg	14	12	0	4,800
272	Round Lake Park	16	12	0	4,800
273	Gillespie	21	12	0	3,919
274	Mt. Morris	20	12	3	3,100
275	Newton	15	12	0	2,977
276	Dixmoor	18	12	0	2,973
277	Heyworth	16	12	0	2,800
278	Mason City	16	12	0	2,558
279	Camp Point	14	12	0	2,434
280	Lewistown	15	12	0	2,400
281	Aviston	20	12	0	2,150
282	Hillsboro	20	12	0	1,980
283	Moweaqua	17	12	0	1,900
284	Albion	17	12	0	1,765
285	North Pekin	18	12	0	1,573
286	Pleasant Plains	14	12	0	1,508
287	Goreville	20	12	0	1,049
288	Lincoln	20	12	0	1,036
289	Mendon	14	12	0	953
290	Lawrencville	14	12	0	920
291	Ramsey	18	12	0	911
292	Mt. Olive	21	12	0	870
293	Tallula	14	12	0	750
294	Ogden	15	12	0	750
295	Tampico	17	12	0	750
296	Creal Springs	20	12	0	710
297	Davis	14	12	0	700
298	Potomac	16	12	0	685
299	Vermont	20	12	0	660
300	Ursa	15	12	0	626
301	Golden	15	12	0	620
302	Liberty	15	12	0	601
303	Taylor Springs	20	12	0	600
304	Virginia	15	12	0	588
305	Wilsonville	21	12	0	586
306	Cullom	16	12	0	563
307	Cedaredge	26	12	0	500
308	East Dubuque	18	12	2	491
309	Latham	17	12	0	380
310	Seymour	22	12	0	350
311	Loraine	14	12	0	300
312	Mt Clare	21	12	0	278
313	Bryant	15	12	0	267
314	Rutland	17	12	0	259
315	West Point	14	12	0	248
316	Patterson	15	12	0	150
317	Eagarville	21	12	0	127
318	Colorado Springs	16	12	0	120
319	La Prairie	16	12	0	47
320	Chrisman	18	12	0	0
321	Litchfield	19	12	0	0
322	Bartelso	16	12	0	0
323	Bowen	14	12	0	0
324	Clayton	14	12	0	0
325	Butler	19	12	0	0
326	Ashmore	14	12	0	0
327	Creve Coeur	17	12	0	0
328	Dawson	15	12	0	0
329	Benld	21	12	0	0
330	Pleasant Hill	16	12	0	0
331	Franklin Grove	15	12	0	0
332	Assumption	16	12	0	0
333	Flat Rock	14	12	0	0
334	Gibson City	17	12	0	0
335	Athens	17	12	0	0
336	Alto Pass	17	12	0	0
337	Bartlett	19	11	0	41,103
338	Chicago Heights	21	11	0	30,300
339	Montgomery	22	11	0	28,956
340	Batavia	22	11	0	26,098
341	Woodstock	19	11	0	25,630
342	Geneva	19	11	0	21,247
343	Lake Zurich	23	11	0	20,022
344	Homewood	18	11	0	19,463
345	Shorewood	22	11	0	17,495
346	Morton	22	11	0	17,111
347	Antioch	20	11	0	14,175
348	Rantoul	17	11	0	13,000
349	Richton Park	22	11	0	12,500
350	Pingree Grove	15	11	0	10,365
351	Flossmoor	19	11	0	9,704
352	Mendota	21	11	0	6,926
353	Shelbyville	16	11	0	6,500
354	Staunton	19	11	0	6,029
355	Pana	19	11	0	5,847
356	East Alton	22	11	2	5,786
357	Mt Vernon	18	11	0	5,483
358	Dupo	17	11	0	5,472
359	Auburn	20	11	0	4,895
360	Freeburg	18	11	0	4,529
361	Lakewood	18	11	0	3,780
362	Mcleansboro	19	11	0	3,762
363	Johnston City	19	11	0	3,639
364	South Jacksonville	19	11	0	3,508
365	Virden	20	11	0	3,425
366	Woodlawn	19	11	0	3,425
367	Marquette Heights	17	11	0	2,974
368	Round Lake Heights	17	11	0	2,773
369	Pawnee	20	11	0	2,739
370	Sesser	17	11	0	2,505
371	Groveland	13	11	0	2,430
372	Poplar Grove	17	11	0	2,372
373	Mulkeytown	18	11	0	2,350
374	Prospect Heights	19	11	0	2,275
375	Whittington	17	11	0	2,261
376	Thompsonville	17	11	0	2,115
377	Zeigler	17	11	0	2,071
378	Roanoke	14	11	0	2,000
379	Belle Rive	18	11	0	1,930
380	New Athens	16	11	0	1,902
381	Cambria	18	11	0	1,760
382	Pontiac	25	11	0	1,665
383	Erie	15	11	0	1,600
384	East Hazel Crest	18	11	0	1,543
385	Crainville	18	11	0	1,506
386	Onarga	13	11	0	1,409
387	Utica	18	11	0	1,400
388	Valier	17	11	0	1,259
389	Royalton	17	11	0	1,118
390	Nauvoo	21	11	0	1,058
391	Illiopolis	15	11	0	1,046
392	Newark	17	11	0	992
393	Witt	16	11	0	991
394	Energy	18	11	0	984
395	Stronghurst	16	11	0	950
396	Dahlgren	18	11	0	862
397	Palmyra	18	11	0	850
398	Logan	17	11	0	845
399	Bushnell	16	11	0	799
400	La Moille	19	11	0	750
401	Yates City	15	11	0	750
402	Tilden	17	11	0	740
403	Carmi	16	11	0	711
404	West City	17	11	0	668
405	Ashley	18	11	0	650
406	Desplaines	19	11	0	581
407	Colp	17	11	0	523
408	Bonnie	18	11	0	516
409	Plymouth	15	11	0	505
410	Reddick	20	11	0	500
411	Golf	19	11	0	498
412	Joppa	13	11	0	450
413	Marietta	16	11	0	440
414	Mount Olive	19	11	0	433
415	Easton	14	11	0	334
416	Arlington	16	11	0	250
417	Manteno	16	11	0	217
418	Metcalf	13	11	0	200
419	Modesto	18	11	0	182
420	Campus	19	11	0	175
421	Lynnville	19	11	0	130
422	Larose	16	11	0	98
423	Elburn	19	11	0	70
424	Galatia	17	11	0	0
425	Cerro Gordo	14	11	0	0
426	Fillmore	13	11	0	0
427	Greenfield	19	11	0	0
428	Blue Mound	15	11	0	0
429	Standard	16	11	0	0
430	Irving	16	11	0	0
431	Coulterville	20	11	0	0
432	Perry	15	11	0	0
433	Divernon	20	11	0	0
434	Mount Erie	15	11	2	0
435	Argenta	14	11	0	0
436	Buckner	17	11	0	0
437	Bone Gap	14	11	1	0
438	Kempton	18	11	0	0
439	Cobden	16	11	0	0
440	Crossville	16	11	0	0
441	Broughton	14	11	0	0
442	Bluford	18	11	0	0
443	Burnt Prairie	16	11	0	0
444	Christopher	17	11	0	0
445	Dix	18	11	0	0
446	Naperville	18	10	0	155,156
447	Arlington Heights	19	10	0	79,000
448	Schaumburg	16	10	0	74,550
449	Palatine	18	10	0	70,875
450	Orland Park	21	10	0	58,862
451	Tinley Park	18	10	0	56,703
452	Wheaton	17	10	0	52,894
453	Hoffman Estates	16	10	0	52,271
454	Downers Grove	16	10	0	49,057
455	Elmhurst	17	10	0	46,387
456	Dekalb	20	10	0	45,000
457	Plainfield	18	10	0	44,762
458	Lombard	17	10	0	44,476
459	Buffalo Grove	18	10	0	44,128
460	Mount Prospect	18	10	0	41,492
461	Streamwood	18	10	0	39,577
462	Carol Stream	17	10	0	39,447
463	Wheeling	18	10	0	39,137
464	Addison	16	10	0	38,017
465	Hanover Park	19	10	0	37,973
466	Calumet City	17	10	0	37,000
467	Elk Grove Village	16	10	0	34,700
468	Glendale Heights	17	10	0	34,208
469	Niles	17	10	0	28,938
470	Glen Ellyn	16	10	0	28,850
471	New Lenox	16	10	0	27,690
472	Lansing	22	10	0	27,657
473	Huntley	15	10	0	27,000
474	Oak Forest	19	10	0	26,547
475	Morton Grove	16	10	0	25,297
476	Westmont	16	10	0	25,000
477	Lisle	17	10	0	24,233
478	Rolling Meadows	19	10	0	24,099
479	Maywood	17	10	0	24,090
480	Roselle	16	10	0	22,897
481	South Holland	18	10	0	22,500
482	Bloomingdale	16	10	0	22,423
483	Villa Park	17	10	0	22,263
484	Darien	16	10	0	22,061
485	Matteson	21	10	0	21,000
486	Bellwood	17	10	0	19,156
487	Ottawa	24	10	0	19,000
488	Brookfield	17	10	0	18,978
489	Bensenville	16	10	0	18,044
490	Hinsdale	15	10	0	17,940
491	Palos Hills	19	10	0	17,484
492	Westchester	16	10	0	16,700
493	Country Club Hills	20	10	0	16,511
494	La Grange	16	10	0	16,200
495	Palos Heights	18	10	0	15,500
496	Dixon	22	10	0	15,433
497	Morris	17	10	0	15,335
498	Midlothian	16	10	0	14,819
499	Chicago Ridge	19	10	0	14,130
500	Hickory Hills	21	10	0	14,049
501	Wood Dale	17	10	0	14,012
502	Lagrange Park	17	10	0	13,579
503	Hazel Crest	19	10	0	13,098
504	Warrenville	20	10	0	12,709
505	Markham	17	10	0	12,500
506	Effingham	21	10	0	12,328
507	North Lake	17	10	0	12,323
508	Nashville	18	10	0	11,374
509	Burr Ridge	17	10	0	11,192
510	Crestwood	20	10	0	10,950
511	Lyons	16	10	0	10,775
512	Oak Brook	16	10	0	9,400
513	Lynwood	17	10	0	9,149
514	Glenwood	16	10	0	8,956
515	Salem	20	10	0	8,406
516	Vandalia	18	10	0	7,458
517	West Dundee	15	10	0	7,339
518	Carlinville	19	10	0	6,112
519	Posen	16	10	0	5,987
520	Eddyville	13	10	0	5,445
521	Highwood	16	10	0	5,331
522	Olympia Fields	18	10	0	4,988
523	Palos Park	19	10	0	4,899
524	Fox River Grove	18	10	0	4,702
525	Hardin	17	10	0	4,675
526	South Chicago Heights	16	10	0	4,164
527	Eldorado	16	10	0	3,921
528	Red Bud	15	10	0	3,804
529	Georgetown	14	10	0	3,678
530	Norris City	13	10	0	2,302
531	Farmer City	14	10	0	2,055
532	Carrier Mills	16	10	0	2,036
533	Kirkland	12	10	0	2,000
534	Phoenix	18	10	0	1,994
535	Farmington Hills	18	10	0	1,954
536	Jonesboro	16	10	0	1,905
537	Girard	19	10	0	1,885
538	Ford Heights	17	10	0	1,813
539	Chenoa	16	10	0	1,785
540	Vienna	14	10	0	1,618
541	Warsaw	18	10	0	1,607
542	Okawville	19	10	0	1,521
543	Roxana	14	10	0	1,454
544	Astoria	15	10	0	1,450
545	New Berlin	16	10	0	1,380
546	Macon	13	10	0	1,216
547	Chebanse	16	10	0	1,200
548	Danvers	14	10	0	1,183
549	Minier	15	10	0	1,180
550	Bridgeport	13	10	0	1,107
551	Neoga	15	10	0	1,100
552	Nilwood	19	10	0	1,063
553	Wyanet	13	10	0	991
554	Albany	17	10	0	950
555	Newman	12	10	0	950
556	Sheffield	14	10	0	854
557	Thayer	19	10	0	793
558	Wolf Lake	17	10	0	783
559	Tiskilwa	14	10	0	740
560	Golconda	14	10	0	672
561	Vergennes	16	10	0	661
562	Shipman	22	10	0	656
563	Clearwater	16	10	0	537
564	Hammond	14	10	0	518
565	Cornell	18	10	0	500
566	Denver	15	10	0	495
567	San Jose	14	10	0	479
568	Ipava	14	10	0	470
569	Weldon	15	10	0	450
570	Table Grove	14	10	0	416
571	Fox Lake	13	10	0	414
572	Sparland	13	10	0	399
573	Clinton	14	10	0	374
574	Herrick	16	10	0	358
575	New Holland	14	10	0	350
576	Freeman Spur	17	10	0	340
577	Cave-in-rock	16	10	0	318
578	Hartsburg	14	10	0	314
579	Stonefort	17	10	0	306
580	Anna	15	10	1	300
581	Mooseheart	16	10	0	272
582	Royal Lakes	22	10	0	268
583	Long Grove	14	10	0	267
584	Sims	20	10	0	259
585	Diamondhead	15	10	0	250
586	Omaha	16	10	0	247
587	Thebes	12	10	0	213
588	Sanford	21	10	0	200
589	Elvaston	17	10	0	165
590	St Charles	17	10	0	130
591	Danforth	15	10	1	113
592	Cabery	15	10	0	100
593	Gorham	20	10	0	0
594	Karnak	12	10	0	0
595	Elizabethtown	16	10	0	0
596	Baylis	16	10	0	0
597	Elizabeth	13	10	0	0
598	Breese	20	10	0	0
599	Camargo	13	10	0	0
600	Kansas	13	10	0	0
601	Maroa	14	10	0	0
602	Blandinsville	16	10	0	0
603	Hartford	17	10	0	0
604	Gifford	15	10	0	0
605	Armington	13	10	0	0
606	Evansville	15	10	0	0
607	Greenup	13	10	0	0
608	Parkersburg	15	10	0	0
609	Atlanta	16	10	0	0
610	Lawrencevill	13	10	0	0
611	Nokomis	16	10	0	0
612	Maeystown	18	10	0	0
613	Ridgway	17	10	0	0
614	Griggsville	17	10	0	0
615	Allendale	14	10	0	0
616	Casey	14	10	0	0
617	Ashkum	18	10	0	0
618	Greenview	12	10	0	0
619	Buckingham	16	10	0	0
620	Harvard	14	10	0	0
621	Belknap	14	10	0	0
622	Carbondale	23	9	0	22,107
623	Washington	16	9	0	14,793
624	Highland	14	9	0	10,919
625	Peru	17	9	0	10,300
626	Maryville	14	9	0	10,150
627	Rochelle	18	9	0	9,574
628	Gilberts	12	9	0	8,366
629	Island Lake	13	9	0	8,200
630	Hampshire	13	9	0	7,758
631	North Riverside	13	9	0	6,672
632	Mahomet	12	9	0	6,580
633	Pinckneyville	16	9	0	6,350
634	Brownstown	17	9	0	5,250
635	Wonder Lake	13	9	0	5,200
636	Milan	16	9	0	5,097
637	Marseilles	16	9	0	5,061
638	Tuscola	11	9	0	4,600
639	Riverton	13	9	0	4,333
640	Sublette	13	9	0	4,100
641	Fairbury	15	9	0	3,964
642	Valmeyer	17	9	0	3,650
643	Oregon	12	9	0	3,545
644	Carrollton	10	9	0	3,383
645	Fulton	16	9	0	3,346
646	Winchester	11	9	0	2,795
647	New Burnside	9	9	0	2,702
648	Amboy	13	9	0	2,500
649	Sullivan	11	9	0	2,500
650	Polo	13	9	0	2,355
651	Lake Barrington	14	9	0	2,300
652	Tamms	11	9	0	2,185
653	Carbon Cliff	16	9	0	2,134
654	Hinckley	13	9	0	2,100
655	South Roxana	14	9	0	1,891
656	Harrisburg	10	9	0	1,793
657	Gilman	13	9	0	1,793
658	Lancaster	9	9	0	1,777
659	Olive Branch	11	9	0	1,763
660	Princeville	12	9	0	1,738
661	Port Byron	12	9	0	1,678
662	Earlville	14	9	0	1,613
663	Teutopolis	11	9	0	1,599
664	St Elmo	17	9	0	1,461
665	Silvis	13	9	0	1,460
666	Gridley	13	9	0	1,411
667	Hopkins Park	15	9	0	1,410
668	Milford	15	9	0	1,369
669	Walnut	14	9	0	1,311
670	Ladd	14	9	0	1,295
671	Thomasboro	13	9	0	1,233
672	Kingston	15	9	0	1,160
673	Malta	12	9	0	1,143
674	Meredosia	15	9	0	1,041
675	Goodfield	16	9	0	986
676	Leland	14	9	0	977
677	Rapids City	12	9	0	964
678	Stonington	12	9	0	932
679	Ridge Farm	13	9	0	912
680	Paw Paw	15	9	0	870
681	Brimfield	13	9	0	856
682	Mclean	11	9	0	830
683	Exeter	11	9	0	820
684	Dongola	11	9	0	752
685	Bluffs	13	9	0	748
686	Keithsburg	15	9	0	747
687	Stewardson	14	9	0	747
688	Saybrook	16	9	0	693
689	Wapella	13	9	0	670
690	Sidell	12	9	0	626
691	Union	11	9	0	552
692	Carlock	16	9	0	550
693	Cherry	17	9	0	490
694	Ullin	11	9	0	476
695	Emden	14	9	0	467
696	Orient	11	9	0	391
697	Martinton	13	9	0	375
698	Woodland	13	9	0	319
699	Roodhouse	10	9	0	297
700	Mapleton	10	9	0	261
701	Pulaski	11	9	0	259
702	Mill Shoals	9	9	0	254
703	Ripley	9	9	0	250
704	Austin	15	9	0	200
705	Broadwell	11	9	0	169
706	Emington	13	9	0	120
707	Noble	14	9	0	0
708	Equality	17	9	0	0
709	Bement	13	9	0	0
710	Rockbridge	10	9	0	0
711	Green Valley	15	9	0	0
712	Adair	9	9	0	0
713	Prairie City	14	9	0	0
714	Beecher City	17	9	0	0
715	Westfield	14	9	0	0
716	Bunker Hill	12	9	0	0
717	Thomson	14	9	0	0
718	Alhambra	21	9	0	0
719	Albers	12	9	0	0
720	Industry	10	9	0	0
721	Kinderhook	14	9	0	0
722	Fieldon	19	9	0	0
723	Kane	12	9	0	0
724	Sciota	17	9	0	0
725	Marshall	14	9	0	0
726	Martinsville	12	9	0	0
727	Pecatonica	13	9	0	0
728	Oblong	10	9	0	0
729	Chadwick	15	9	0	0
730	Buffalo	12	9	0	0
731	Alexander	12	9	0	0
732	Ashland	9	9	0	0
733	Arenzville	11	9	0	0
734	Chandlerville	11	9	0	0
735	Oakford	10	9	0	0
736	Crescent City	14	9	0	0
737	Makanda	23	9	0	0
738	Braceville	12	9	0	0
739	Mcclure	11	9	0	0
740	Mounds	11	9	0	0
741	Ashton	14	9	0	0
742	Burlington	13	9	0	0
743	Woodridge	10	8	0	123,148
744	Oswego	16	8	0	38,169
745	Channahon	16	8	1	12,833
746	Kewanee	13	8	0	12,547
747	Itasca	12	8	0	9,867
748	Winfield	10	8	0	9,835
749	Steger	12	8	0	9,700
750	Riverside	11	8	0	9,298
751	Paris	13	8	0	9,077
752	Olney	13	8	0	8,877
753	Clarendon Hills	11	8	0	8,653
754	Willowbrook	11	8	0	8,540
755	Hillside	11	8	0	8,200
756	Broadview	11	8	0	7,932
757	Metropolis	13	8	0	6,830
758	Lagrange	10	8	0	6,500
759	Countryside	10	8	0	6,420
760	Eureka	18	8	0	5,372
761	Pittsfield	13	8	0	5,327
762	Monticello	14	8	0	5,250
763	Berkeley	11	8	0	5,214
764	Genoa	13	8	0	5,200
765	Cherry Valley	11	8	0	4,731
766	Morrison	16	8	0	4,188
767	Burnham	10	8	0	4,159
768	Smithton	11	8	0	4,006
769	Pittsburg	9	8	0	3,927
770	Leroy	15	8	0	3,800
771	Wayne City	11	8	0	3,516
772	Indian Head Park	10	8	0	3,238
773	Winnebago	11	8	0	3,000
774	El Paso	11	8	0	2,812
775	Lena	11	8	0	2,772
776	Arcola	8	8	0	2,750
777	Galva	14	8	0	2,589
778	Lakemoor	13	8	0	2,530
779	Diamond	14	8	0	2,508
780	Seneca	13	8	0	2,371
781	Buncombe	11	8	0	2,191
782	Mt Sterling	8	8	0	1,953
783	Lexington	13	8	0	1,930
784	Pierron	11	8	0	1,928
785	Stockton	12	8	0	1,900
786	Depue	14	8	0	1,838
787	St. Jacob	9	8	0	1,835
788	East Carondelet	10	8	0	1,833
789	Herscher	9	8	0	1,600
790	Beecher	15	8	0	1,528
791	Arthur	8	8	0	1,500
792	Hodgkins	11	8	0	1,472
793	Forreston	11	8	0	1,469
794	Oakbrook Terrace	10	8	0	1,440
795	Warren	15	8	0	1,428
796	Chatsworth	12	8	0	1,256
797	Atwood	12	8	0	1,250
798	Stillman Valley	11	8	0	1,200
799	Dowell	11	8	0	1,130
800	Oquawka	16	8	0	1,125
801	Johnsburg	12	8	0	1,124
802	Downs	12	8	0	1,005
803	Southfield	11	8	0	1,001
804	Ava	19	8	0	994
805	Bismarck	12	8	0	900
806	Coello	9	8	0	858
807	Wataga	14	8	0	843
808	Willisville	18	8	0	831
809	Hurst	10	8	0	812
810	Tonica	16	8	0	800
811	South Wilmington	15	8	0	700
812	White Heath	11	8	0	660
813	Damiansville	11	8	0	650
814	Hecker	11	8	0	645
815	Cuba	13	8	0	595
816	Mound City	13	8	0	588
817	Raleigh	9	8	0	578
818	Williamsfield	11	8	0	575
819	Creston	13	8	0	535
820	Tovey	10	8	0	512
821	Sandy	11	8	0	507
822	Fithian	10	8	0	485
823	Leaf River	10	8	0	450
824	Neponset	15	8	0	427
825	Elkhart	11	8	0	426
826	Shiloh	13	8	0	387
827	Gladstone	14	8	0	387
828	Oakland	10	8	0	380
829	Scales Mound	11	8	0	376
830	Richview	9	8	0	375
831	Ivesdale	11	8	0	360
832	New Canton	10	8	0	359
833	Jeffersonville	10	8	0	355
834	Lee	14	8	0	313
835	Willow Hill	9	8	0	309
836	Desoto	9	8	0	285
837	Keensburg	13	8	0	267
838	Kingston Mines	10	8	0	266
839	Rio	15	8	0	265
840	Destin	9	8	0	218
841	Mineral	15	8	0	206
842	Compton	16	8	0	200
843	Lowpoint	12	8	0	200
844	Harvel	10	8	0	191
845	North Henderson	13	8	0	187
846	Springerton	11	8	0	178
847	Muddy	9	8	0	171
848	Chesterfield	10	8	0	170
849	West Brooklyn	13	8	0	150
850	Strawn	13	8	0	133
851	Lindenwood	12	8	0	120
852	Iola	14	8	0	114
853	Boise	15	8	0	100
854	Bettendorf	11	8	0	100
855	Mt. Sterling	8	8	0	83
856	Hines	11	8	0	60
857	Stevens Point	13	8	0	52
858	Elkville	19	8	0	0
859	Olmsted	11	8	0	0
860	Alma	10	8	0	0
861	Cisco	12	8	0	0
862	Bethany	10	8	0	0
863	Marine	14	8	0	0
864	Calhoun	12	8	0	0
865	Brussels	14	8	0	0
866	Manito	10	8	0	0
867	Lovington	12	8	0	0
868	Hull	12	8	0	0
869	Odell	10	8	0	0
870	Donnellson	10	8	1	0
871	New Douglas	10	8	0	0
872	Worden	13	8	0	0
873	Good Hope	16	8	0	0
874	Altona	16	8	0	0
875	Harmon	14	8	0	0
876	Durand	11	8	0	0
877	Versailles	10	8	0	0
878	Dundas	14	8	0	0
879	Beardstown	14	8	0	0
880	Steward	11	8	0	0
881	Buckley	11	8	0	0
882	Enfield	11	8	0	0
883	Campbell Hill	17	8	0	0
884	Milledgeville	14	8	0	0
885	New Haven	14	8	0	0
886	Grand Tower	12	8	0	0
887	Cortland	14	8	0	0
888	Barrington	15	7	0	10,327
889	Manhattan	16	7	0	7,800
890	Chillicothe	12	7	0	5,996
891	Hoopeston	15	7	0	5,802
892	Coal City	13	7	0	5,749
893	Spring Valley	13	7	0	5,582
894	Wasco	9	7	0	4,000
895	Metamora	12	7	0	3,904
896	Galena	10	7	0	3,308
897	East Dundee	10	7	0	3,000
898	Havana	10	7	0	2,963
899	Thornton	7	7	0	2,333
900	Henry	11	7	0	2,250
901	Tremont	10	7	0	2,114
902	Prophetstown	14	7	0	2,100
903	Carlyle	9	7	0	1,982
904	Rockdale	18	7	0	1,888
905	Grayville	11	7	0	1,723
906	Waterman	13	7	0	1,506
907	Toulon	11	7	0	1,397
908	Wyoming	12	7	0	1,300
909	Warrensburg	12	7	0	1,300
910	Forrest	12	7	0	1,225
911	Washburn	13	7	0	1,200
912	South Pekin	10	7	0	1,146
913	Wenona	13	7	1	979
914	Hamel	8	7	0	887
915	Hanover	10	7	0	833
916	Cowden	12	7	0	612
917	Sawyerville	9	7	0	578
918	Keyesport	9	7	0	522
919	Taylor Ridge	12	7	0	485
920	Congerville	10	7	0	474
921	Ohio	12	7	0	465
922	Secor	11	7	1	400
923	St Peter	8	7	0	387
924	Carbon Hill	13	7	0	370
925	Victoria	13	7	0	316
926	Glendale	9	7	0	280
927	Colona	11	7	0	260
928	New Minden	8	7	0	250
929	Pittsburgh	9	7	0	195
930	Hettick	9	7	0	188
931	Penfield	10	7	0	150
932	Camp Grove	15	7	0	100
933	Hollowayville	13	7	0	100
934	Lynn Center	11	7	0	100
935	Monroe Center	10	7	0	100
936	Illinois City	12	7	0	53
937	Brocton	11	7	0	0
938	Mansfield	14	7	0	0
939	Viola	13	7	0	0
940	New Boston	11	7	0	0
941	Cambridge	13	7	0	0
942	Deer Creek	9	7	0	0
943	Paxton	10	7	0	0
944	St Francisville	10	7	0	0
945	Braidwood	13	7	0	0
946	Beaverville	11	7	0	0
947	Iuka	10	7	0	0
948	Princeton	10	6	0	7,660
949	Monee	10	6	0	5,148
950	Oglesby	11	6	0	4,500
951	Forsyth	10	6	0	3,490
952	Davis Junction	9	6	0	2,373
953	Elmwood	10	6	0	2,058
954	Minonk	12	6	0	1,948
955	Lacon	11	6	0	1,878
956	Orion	16	6	0	1,861
957	Sheridan	11	6	0	1,800
958	Maple Park	11	6	0	1,300
959	Homer	13	6	0	1,200
960	Flanagan	12	6	0	1,110
961	Colfax	13	6	0	989
962	Hopedale	10	6	0	830
963	Bradford	12	6	0	750
964	New Windsor	8	6	0	740
965	Cordova	11	6	0	672
966	Stanford	10	6	0	670
967	Reynolds	14	6	0	550
968	Geneseo	9	6	0	500
969	Lostant	11	6	0	463
970	Middleton	10	6	0	434
971	Gardner	11	6	0	411
972	Lima	10	6	1	395
973	Coal Valley	9	6	0	380
974	Bellflower	9	6	0	357
975	Malden	13	6	0	326
976	Nebo	8	6	0	325
977	Arrowsmith	10	6	0	315
978	Seatonville	12	6	0	314
979	Royal	12	6	0	310
980	Alvin	9	6	0	300
981	Ellsworth	10	6	0	271
982	Roscoe	8	6	0	250
983	Lafayette	11	6	0	250
984	Waggoner	8	6	0	245
985	Oglesgby	11	6	0	243
986	Palmer	10	6	0	229
987	Aledo	11	6	0	200
988	Wadsworth	11	6	0	185
989	Longview	12	6	0	153
990	Osco	12	6	0	115
991	Van Orin	12	6	0	100
992	Dalton City	10	6	0	0
993	Milton	9	6	0	0
994	Mcnabb	13	6	0	0
995	Shannon	11	6	0	0
996	Lanark	8	6	0	0
997	Cedarville	9	6	0	0
998	Roberts	11	6	0	0
999	Melvin	9	6	0	0
1000	Capron	15	6	0	0
1001	Sauk Village	18	5	0	9,921
1002	Mackinaw	12	5	0	3,450
1003	Elwood	11	5	0	2,279
1004	Somonauk	12	5	0	1,786
1005	Sheldon	8	5	0	950
1006	Pearl City	11	5	0	790
1007	Rankin	8	5	0	650
1008	Loda	10	5	0	645
1009	Hennepin	11	5	0	266
1010	Bishop Hill	9	5	0	110
1011	Rockton	10	5	0	80
1012	Flagstaff	9	5	0	47
1013	Avon	11	5	0	0
1014	La Harpe	8	5	0	0
1015	Andover	9	5	0	0
1016	Savanna	9	5	0	0
1017	Percy	11	5	0	0
1018	Mt. Carroll	8	5	0	0
1019	Piper City	8	5	0	0
1020	Cissna Park	9	5	0	0
1021	Bellmont	7	5	0	0
1022	Toluca	8	4	0	1,425
1023	Payson	9	4	0	1,398
1024	Rossville	8	4	0	1,331
1025	St Anne	7	4	0	1,300
1026	Shabbona	10	4	0	881
1027	Sherrard	9	4	0	811
1028	Fairmount	9	4	0	690
1029	German Valley	11	4	0	463
1030	Waynesville	6	4	0	452
1031	Crete	6	4	0	400
1032	Altamont	13	4	0	386
1033	Smithfield	10	4	0	375
1034	Allerton	7	4	0	304
1035	Thawville	9	4	0	270
1036	Shawneetown	7	4	0	195
1037	Anchor	6	4	0	155
1038	Clifton	10	4	0	55
1039	Hume	8	4	0	0
1040	Alexis	9	4	0	0
1041	Elliott	8	4	0	0
1042	Monmouth	10	3	0	9,841
1043	Orangeville	8	3	0	780
1044	Godley	10	3	0	660
1045	Benson	7	3	0	450
1046	Chestnut	5	3	0	435
1047	Joy	9	3	0	372
1048	Barry	6	3	0	264
1049	Delavan	8	3	0	235
1050	Bristol	5	3	0	100
1051	Batchtown	7	3	0	0
1052	Joliet	16	2	0	148,693
1053	Lemont	11	2	0	17,500
1054	Kirkwood	8	2	0	794
1055	Woodhull	5	2	0	750
1056	Alpha	9	2	0	700
1057	Hopewell	5	2	0	420
1058	Rock City	4	2	0	313
1059	East Lynn	5	2	0	112
1060	Sibley	6	2	0	0
1061	Donovan	5	2	0	0
1062	North Aurora	11	1	0	18,350
1063	Steeleville	5	1	0	2,082
1064	Dubuque	3	1	0	700
1065	Matherville	5	1	0	670
1066	Lyndon	7	1	0	648
1067	Ruma	4	1	0	450
1068	Maquon	6	1	0	284
1069	Granville	4	1	0	0
1070	Claremont	3	1	0	0
1071	Cutler	2	1	0	0
1072	Brookport	3	1	0	0
1073	St. Petersburg	0	0	0	105
1074	Ludlow	0	0	0	34

Recommended Filtration for Illinois

Based on the most common contaminants found across Illinois (Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Chloroform), 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 Illinois 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 Illinois tap water safe to drink?

Water quality varies significantly across Illinois. Of the 1074 cities analyzed, the average city has 10.0 contaminants above EWG health guidelines. The best water quality was found in St. Petersburg. We recommend checking your specific city's report for detailed information.

What city has the best water in Illinois?

Based on our analysis, St. Petersburg has the fewest contaminants above EWG health guidelines in Illinois, with 0 above guideline levels.

What city has the worst water in Illinois?

Based on our analysis, Hanna City has the most contaminants above EWG health guidelines in Illinois, with 19 above guideline levels.

What's the best water filter for Illinois residents?

For most Illinois 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.

Illinois Water Quality Report (2026)