Ohio Tap Water Quality Report

636 cities analyzed • 9,180,641 people served

Updated March 2026 • Data from EWG & EPA SDWIS

636

Cities Analyzed

10.5

Avg Above Guidelines

9,180,641

Total Population Served

Best Water Quality

Perrysburg (0 above guidelines)

Most Concerns

South Lebanon (17 above guidelines)

Most Common Contaminants in Ohio

Contaminant	Found In	% of Cities
Chloroform carcinogen	617 of 636	97%
Bromodichloromethane carcinogen	608 of 636	96%
Total trihalomethanes (TTHMs) carcinogen	606 of 636	95%
Dibromochloromethane carcinogen	601 of 636	94%
Bromoform carcinogen	568 of 636	89%
Dichloroacetic acid carcinogen	536 of 636	84%
Dibromoacetic acid	530 of 636	83%
Haloacetic acids (HAA5) carcinogen	522 of 636	82%
Trichloroacetic acid carcinogen	465 of 636	73%
Fluoride	448 of 636	70%

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	Ironton	32	17	0	34,942
2	South Lebanon	27	17	0	6,541
3	Cincinnati	26	16	0	750,200
4	Beavercreek	22	16	0	51,229
5	Goshen	26	16	1	39,508
6	Lebanon	24	16	1	39,009
7	Jamestown	21	16	1	32,350
8	Bowling Green	28	16	0	31,578
9	Gallipolis	22	16	1	20,995
10	Marietta	25	16	2	18,707
11	Ravenna	25	16	0	16,000
12	Bexley	30	16	0	14,250
13	Wilmington	29	16	1	12,401
14	Celina	22	16	0	11,682
15	Milford	24	16	1	6,700
16	Brookville	28	16	0	5,923
17	Waterville	29	16	0	5,715
18	Chagrin Falls	28	16	0	4,991
19	Bridgeport	19	16	0	2,830
20	Grand Rapids	28	16	0	1,500
21	Rio Grande	23	16	1	830
22	Tontogany	28	16	0	671
23	Phillipsburg	19	16	2	490
24	Ashley	31	16	0	0
25	Columbus	27	15	0	1,288,850
26	Delaware	31	15	0	150,000
27	Kettering	27	15	1	149,410
28	Dayton	27	15	0	140,407
29	Trenton	23	15	0	51,229
30	Reynoldsburg	28	15	0	37,847
31	Glenford	27	15	0	33,258
32	Whitehouse	24	15	0	25,041
33	Oregon	24	15	0	19,950
34	Norwood	26	15	0	19,870
35	Berea	25	15	0	19,000
36	New Philadelphia	25	15	0	17,410
37	Steubenville	24	15	0	17,000
38	Vandalia	29	15	2	16,551
39	Loveland	24	15	1	12,800
40	Wapakoneta	20	15	0	11,000
41	Van Wert	30	15	0	10,846
42	Wellsville	24	15	0	10,300
43	Reading	26	15	0	9,506
44	Trotwood	27	15	0	9,000
45	Orient	19	15	0	3,376
46	Genoa	24	15	0	2,800
47	Lockbourne	27	15	0	275
48	Grove City	28	15	0	85
49	Toledo	22	14	0	480,000
50	Kent	26	14	0	280,000
51	Marion	27	14	0	46,317
52	Portsmouth	26	14	0	40,475
53	Marysville	28	14	0	25,571
54	Alliance	24	14	0	22,232
55	Sylvania	22	14	0	21,618
56	Ashland	23	14	0	20,648
57	Springboro	20	14	0	19,263
58	Fremont	22	14	0	18,319
59	Tallmadge	27	14	0	18,000
60	Franklin	20	14	0	17,175
61	Aurora	25	14	0	15,852
62	Lancaster	22	14	0	15,486
63	Maumee	22	14	0	14,286
64	Englewood	19	14	0	13,463
65	Mcdermott	24	14	0	11,059
66	Sebring	17	14	0	6,159
67	West Milton	22	14	0	4,800
68	Cedarville	21	14	0	4,000
69	Carlisle	20	14	0	1,557
70	Southfield	21	14	0	1,500
71	Attica	26	14	0	1,148
72	Hamersville	21	14	0	925
73	Nevada	22	14	0	814
74	Washingtonville	22	14	0	801
75	Franlin Furnace	26	14	0	132
76	Bellbrook	18	14	0	0
77	Columbia Station	22	14	0	0
78	Cleveland	24	13	0	1,308,955
79	Batavia	27	13	0	133,059
80	Oxford	21	13	0	113,495
81	Mentor	24	13	0	74,500
82	Lima	23	13	0	65,619
83	Findlay	21	13	0	54,040
84	Lakewood	24	13	0	50,942
85	Newark	28	13	0	49,934
86	Westerville	25	13	0	39,000
87	Stow	28	13	0	35,437
88	Chillicothe	19	13	0	35,345
89	Zanesville	22	13	0	29,381
90	Xenia	21	13	0	29,000
91	St. Clairsville	19	13	0	26,822
92	Troy	21	13	0	26,305
93	Sandusky	21	13	0	25,793
94	North Canton	25	13	0	24,747
95	Sidney	25	13	0	20,614
96	Piqua	23	13	0	20,354
97	Miamisburg	23	13	0	19,790
98	Salem	21	13	0	16,850
99	Waverly	20	13	0	15,487
100	Monroe	23	13	0	14,269
101	Washington Ch	20	13	0	14,100
102	Wintersville	23	13	0	13,983
103	Lucasville	21	13	0	13,820
104	Fostoria	22	13	0	13,441
105	Bedford	25	13	0	13,074
106	West Carrollton	21	13	0	12,910
107	East Liverpool	25	13	0	12,586
108	Bucyrus	20	13	0	12,570
109	Conneaut	24	13	0	12,538
110	Vermilion	26	13	0	10,569
111	West Chester	16	13	0	10,256
112	Franklin Furnace	19	13	0	9,920
113	Pataskala	16	13	0	9,900
114	Napoleon	22	13	0	8,858
115	W. Alexandria	15	13	0	8,400
116	Wauseon	16	13	0	7,568
117	New Carlisle	18	13	0	5,800
118	Bellaire	16	13	0	4,278
119	Georgetown	20	13	1	4,243
120	Bethel	22	13	1	3,900
121	Elida	23	13	0	3,848
122	Yellow Springs	17	13	0	3,761
123	Mt. Gilead	16	13	0	3,503
124	Groveport	20	13	0	3,248
125	Lowell	16	13	1	3,022
126	Chardon	24	13	0	3,000
127	Eaton	16	13	0	2,950
128	Fredericktown	17	13	0	2,648
129	Middleport	18	13	0	2,446
130	Richwood	17	13	0	2,316
131	Olmsted Twp	24	13	0	2,199
132	New Waterford	23	13	0	1,959
133	Flushing	20	13	0	1,803
134	Union City	19	13	0	1,650
135	Danville	18	13	0	1,014
136	Wayne	16	13	0	941
137	New Holland	16	13	0	857
138	Quincy	19	13	0	706
139	Racine	18	13	0	675
140	New Athens	20	13	0	595
141	Los Angeles	18	13	0	578
142	Lyons	16	13	0	562
143	Spring Valley	15	13	0	523
144	Florida	22	13	0	450
145	Pleasant City	19	13	0	447
146	Morristown	20	13	0	315
147	Malinta	22	13	0	265
148	Lisbon	22	13	0	200
149	Waverley	20	13	0	91
150	Antwerp	16	13	0	0
151	Brilliant	18	13	0	0
152	Freeport	18	13	0	0
153	Bethesda	18	13	0	0
154	Arcadia	22	13	0	0
155	Degraff	16	13	0	0
156	Stockport	16	13	1	0
157	Millersport	17	13	0	0
158	Clyde	25	13	0	0
159	Oak Hill	20	13	0	0
160	Youngstown	17	12	1	148,000
161	Painesville	21	12	0	78,379
162	Lorain	22	12	0	68,000
163	Springfield	18	12	0	60,680
164	Mansfield	21	12	0	51,000
165	Hamilton	21	12	0	43,108
166	Athens	19	12	0	32,725
167	Ripley	20	12	0	29,010
168	Norton	23	12	0	28,500
169	Hillsboro	18	12	0	28,421
170	Avon	21	12	0	23,800
171	Avon Lake	20	12	0	23,659
172	New Richmond	21	12	0	22,777
173	West Union	21	12	0	21,810
174	Port Clinton	22	12	0	19,556
175	Pickerington	19	12	0	19,141
176	Defiance	25	12	0	16,494
177	Long Bottom	19	12	0	16,087
178	Girard	22	12	1	14,122
179	Bellefontaine	25	12	0	13,249
180	Greenville	20	12	0	13,227
181	Urbana	25	12	0	11,428
182	Blacklick	16	12	0	11,294
183	Bolivar	14	12	0	6,587
184	Belpre	20	12	1	6,441
185	London	15	12	0	5,176
186	Oak Harbor	22	12	0	4,615
187	Bluffton	22	12	0	4,125
188	Barnesville	18	12	0	3,689
189	Union	14	12	0	3,500
190	The Plains	19	12	0	3,276
191	Fairport Harbor	21	12	0	3,180
192	Obetz	15	12	0	3,167
193	Waterford	17	12	1	3,000
194	Loudonville	15	12	0	2,641
195	Strasburg	14	12	0	2,610
196	Woodsfield	18	12	0	2,598
197	Gibsonburg	20	12	0	2,506
198	Hebron	15	12	0	2,360
199	Cardington	18	12	0	2,079
200	Mount Sterling	14	12	0	2,000
201	Peebles	21	12	0	1,978
202	Roseville	22	12	0	1,852
203	Green Springs	25	12	0	1,592
204	Lithopolis	14	12	0	1,573
205	New Lexington	15	12	0	1,567
206	Sometset	15	12	0	1,490
207	West Alexandria	14	12	0	1,385
208	Pioneer	16	12	0	1,380
209	Fayette	15	12	0	1,340
210	Middletown	15	12	0	1,280
211	Mount Gillead	17	12	0	1,274
212	Walnut Creek	15	12	0	1,270
213	Creston	13	12	0	1,232
214	Seaman	21	12	0	1,052
215	Buckeye Lake	16	12	0	1,025
216	Seven Mile	21	12	0	1,000
217	Thornville	14	12	0	991
218	Dunkirk	15	12	0	875
219	Waynesfield	14	12	0	831
220	Scio	16	12	0	763
221	Quaker City	16	12	0	750
222	Farmington Hills	14	12	0	713
223	North Olmsted	14	12	0	650
224	Russia	15	12	0	640
225	Rock Creek	19	12	0	529
226	Rayland	15	12	0	481
227	Bloomfield Hills	22	12	0	480
228	Chickasaw	15	12	0	358
229	Duncan Falls	22	12	0	266
230	Deersville	14	12	0	82
231	Bloomingburg	15	12	0	0
232	Kelleys Island	23	12	0	0
233	W Salem	16	12	0	0
234	Chesterhill	14	12	1	0
235	Greenfield	20	12	0	0
236	Clarksville	19	12	1	0
237	Covington	16	12	0	0
238	Jerusalem	17	12	0	0
239	College Corner	21	12	0	0
240	Canfield	19	12	1	0
241	Rutland	14	12	0	0
242	Canton	23	11	0	107,113
243	Massillon	23	11	0	95,636
244	Lagrange	21	11	0	73,125
245	Cuyahoga Falls	18	11	0	51,114
246	Tipp City	17	11	0	24,766
247	Niles	18	11	1	21,961
248	Streetsboro	19	11	0	15,105
249	Jefferson	23	11	0	13,972
250	Circleville	19	11	0	13,965
251	Coshocton	21	11	0	13,537
252	Cambridge	21	11	1	10,635
253	Galion	19	11	0	10,453
254	Canal Winchester	15	11	0	9,286
255	Oakwood	17	11	0	9,202
256	Vienna	19	11	1	8,872
257	Bellevue	14	11	0	8,282
258	Delphos	16	11	0	7,101
259	Willard	14	11	0	7,099
260	Martins Ferry	13	11	0	6,980
261	Columbiana	13	11	0	6,750
262	Ontario	15	11	0	6,656
263	Mount Orab	20	11	0	6,607
264	White Cottage	20	11	1	6,540
265	Ada	16	11	0	5,952
266	Toronto	16	11	0	5,676
267	Millfield	16	11	0	5,451
268	Johnstown	16	11	0	5,200
269	Byesville	18	11	0	5,104
270	Munroe Falls	18	11	0	5,042
271	Laings	15	11	0	5,037
272	Ottawa	20	11	0	4,863
273	Montpelier	14	11	0	3,990
274	Swanton	13	11	0	3,855
275	Waynesville	12	11	0	3,800
276	Felicity	13	11	0	3,700
277	Paulding	20	11	0	3,605
278	Lockland	16	11	0	3,486
279	Morrow	14	11	1	3,360
280	New Miami	13	11	0	3,200
281	Mcdonald	17	11	1	3,172
282	Carrollton	14	11	0	3,055
283	New Bremen	15	11	0	3,034
284	Grafton	21	11	0	2,769
285	Silver Lake	18	11	0	2,519
286	Sabina	14	11	0	2,493
287	Sardinia	19	11	0	2,428
288	Malta	15	11	0	2,340
289	Piketon	14	11	0	2,181
290	Camden	12	11	0	2,050
291	Manchester	16	11	0	2,043
292	Edgerton	14	11	0	1,881
293	Plymouth	15	11	0	1,874
294	North Lewisburg	14	11	0	1,850
295	Lewisburg	14	11	0	1,800
296	Mcconnelsville	13	11	0	1,780
297	Roaming Shores	18	11	0	1,764
298	West Unity	13	11	0	1,760
299	Glouster	15	11	0	1,659
300	Russells Point	14	11	0	1,651
301	Louisville	23	11	0	1,606
302	Newport	15	11	1	1,582
303	Anna	15	11	0	1,558
304	Winesburg	17	11	0	1,450
305	Monroeville	16	11	0	1,400
306	Pemberville	17	11	0	1,360
307	Pandora	14	11	0	1,204
308	Malvern	12	11	0	1,200
309	Payne	14	11	0	1,194
310	Rockford	13	11	0	1,120
311	Frankfort	14	11	0	1,100
312	Magnolia	14	11	0	1,085
313	Lakeview	14	11	0	1,083
314	Philo	13	11	0	1,050
315	Williamsport	13	11	0	1,038
316	Kingston	12	11	0	1,032
317	Glandorf	20	11	0	1,001
318	Gratis	16	11	0	990
319	Hopedale	17	11	0	984
320	Hamden	16	11	0	970
321	Alger	15	11	0	943
322	Carbon Hill	15	11	0	910
323	Albany	19	11	0	901
324	Addyston	13	11	0	900
325	Marblehead	17	11	0	865
326	Ohio City	14	11	0	705
327	West Mansfield	13	11	0	700
328	Shiloh	13	11	0	619
329	Shawnee	16	11	0	605
330	Proctorville	12	11	0	574
331	Corning	15	11	0	563
332	North Hampton	14	11	0	538
333	Christiansburg	15	11	0	526
334	South Charleston	17	11	0	507
335	Durham	16	11	0	505
336	Jacksonville	15	11	0	481
337	Trimble	15	11	0	480
338	West Covina	14	11	1	460
339	Murray City	16	11	0	449
340	Sugar Grove	15	11	0	426
341	Belmont	11	11	0	400
342	Willshire	15	11	0	397
343	Permberville	13	11	0	329
344	Crooksville	15	11	0	175
345	St Paris	19	11	0	120
346	West Lafayette	20	11	0	100
347	Boyton Beach	16	11	0	80
348	Amanda	15	11	0	0
349	Convoy	14	11	0	0
350	Commercial Point	17	11	0	0
351	Fletcher	13	11	0	0
352	Junction City	15	11	0	0
353	Belle Center	14	11	0	0
354	Hicksville	14	11	0	0
355	Bradner	15	11	0	0
356	New London	18	11	0	0
357	Mt Victory	13	11	0	0
358	New Straitsville	15	11	0	0
359	Carey	15	11	0	0
360	Jeffersonville	14	11	0	0
361	Jewett	13	11	0	0
362	Arcanum	16	11	0	0
363	Beach City	23	11	0	0
364	Amesville	16	11	0	0
365	Struthers	22	10	0	58,551
366	Medina	22	10	0	46,324
367	Ashtabula	22	10	0	32,408
368	North Ridgeville	20	10	0	29,465
369	Wadsworth	17	10	0	24,356
370	Norwalk	18	10	0	18,224
371	Huron	18	10	0	17,241
372	Baltimore	21	10	0	16,300
373	Amherst	16	10	0	11,797
374	Harrison	12	10	0	11,400
375	Shelby	15	10	0	9,453
376	Dennison	11	10	0	9,224
377	Bryan	16	10	0	8,729
378	Hudson	13	10	0	8,385
379	Navarre	12	10	0	8,380
380	Newton Falls	16	10	0	6,109
381	Cleves	17	10	0	6,000
382	Geneva	22	10	0	5,924
383	Plain City	15	10	0	4,900
384	Coldwater	14	10	0	4,774
385	East Palestine	14	10	0	4,761
386	Sheffield Village	21	10	0	4,165
387	Granville	12	10	0	3,546
388	Lordstown	12	10	1	3,515
389	Forest	20	10	0	3,432
390	Lakemore	13	10	0	3,068
391	Mingo Junction	14	10	0	3,052
392	Millersburg	12	10	0	3,025
393	Middlefield	12	10	0	2,694
394	Versailles	15	10	0	2,687
395	Sarahsville	15	10	1	2,670
396	St Henry	14	10	0	2,596
397	Mcarthur	14	10	0	2,400
398	Garrettsville	13	10	0	2,325
399	Seville	13	10	0	2,296
400	Oak Harber	13	10	0	2,288
401	Milan	18	10	0	2,223
402	Windham	15	10	0	2,200
403	Coal Grove	14	10	0	2,167
404	Woodville	13	10	0	2,006
405	Dresden	12	10	0	2,000
406	Criderville	13	10	0	1,856
407	South Amherst	21	10	0	1,688
408	New Paris	15	10	0	1,681
409	Orwell	14	10	0	1,660
410	Kalida	14	10	0	1,542
411	Shreve	12	10	0	1,514
412	Fort Loramie	12	10	0	1,497
413	Chauncey	13	10	0	1,428
414	Frazeysburg	12	10	0	1,340
415	Liberty Center	10	10	0	1,180
416	Wakeman	18	10	0	1,047
417	Dillonvale	16	10	0	1,019
418	New Knoxville	11	10	0	946
419	Spencer	21	10	0	800
420	Milford Center	13	10	0	792
421	Perrysville	13	10	0	735
422	Dallas	15	10	0	730
423	Put-in-bay	17	10	0	700
424	Bettsville	13	10	0	661
425	Orem	20	10	0	570
426	Rushsylvania	14	10	0	551
427	Eldorado	14	10	0	539
428	North Fairfield	12	10	0	534
429	Gettysburg	14	10	0	513
430	Mt Blanchard	13	10	0	488
431	West Manchester	16	10	0	471
432	Morgantown	14	10	0	450
433	Lindsey	12	10	0	446
434	Ney	13	10	0	354
435	Wilmot	10	10	0	325
436	Holmesville	12	10	0	315
437	Canal Fulton	12	10	0	95
438	Woodstock	15	10	0	42
439	Rushville	12	10	0	36
440	Bainbridge	14	10	0	0
441	Lynchburg	11	10	0	0
442	Lodi	13	10	0	0
443	Alexandria	12	10	0	0
444	Beaver	12	10	0	0
445	Ansonia	13	10	0	0
446	Bremen	12	10	0	0
447	Laurelville	11	10	0	0
448	East Sparta	13	10	0	0
449	Brewster	11	10	0	0
450	Germantown	14	10	0	0
451	Warren	25	9	0	49,130
452	Jackson	13	9	0	15,984
453	Dover	16	9	0	13,253
454	Little Hocking	19	9	2	9,892
455	Hubbard	14	9	0	8,339
456	Nelsonville	15	9	0	6,656
457	Fayetteville	17	9	0	4,243
458	South Point	16	9	2	4,133
459	Cadiz	11	9	0	3,353
460	Caldwell	13	9	1	3,300
461	Gambier	15	9	0	2,502
462	West Liberty	12	9	0	1,800
463	Powhattan Point	12	9	1	1,493
464	Arlington	12	9	0	1,451
465	Elmore	10	9	0	1,421
466	Tiltonsville	12	9	0	1,372
467	Delta	9	9	0	1,269
468	New Vienna	12	9	0	1,240
469	Pleasant Hill	17	9	0	1,226
470	Continental	15	9	0	1,153
471	Holgate	15	9	1	1,150
472	Sycamore	11	9	0	862
473	Adena	10	9	0	820
474	Chesterland	12	9	0	700
475	Hamler	13	9	1	627
476	Thurston	12	9	0	604
477	Middle Point	12	9	0	576
478	Rawson	12	9	0	570
479	Verona	12	9	0	492
480	Mt Pleasant	9	9	0	450
481	Bowerston	13	9	0	398
482	South Vienna	12	9	1	393
483	Holloway	12	9	0	360
484	Middleburg Heights	13	9	0	339
485	Beaverdam	12	9	0	319
486	Solon	12	9	0	273
487	Cadia	12	9	0	257
488	Brimfield	12	9	0	183
489	Irwin	11	9	0	150
490	La Jolla	12	9	0	100
491	Beechwood	10	9	0	50
492	South Euclid	10	9	0	50
493	Springville	12	9	0	50
494	Madison	12	9	0	35
495	Coalton	14	9	0	0
496	Burbank	15	9	0	0
497	Jeromesville	12	9	0	0
498	Lucas	12	9	0	0
499	Greenwich	10	9	0	0
500	Lakeville	12	9	0	0
501	Jackson Center	13	9	0	0
502	Clarksburg	12	9	0	0
503	Sheffield Lake	10	8	0	9,108
504	Cortland	12	8	0	7,104
505	Wellston	17	8	0	7,000
506	Logan	10	8	0	6,704
507	Upper Sandusky	15	8	0	6,698
508	Andover	13	8	0	5,600
509	Wellington	14	8	0	4,802
510	West Jefferson	12	8	0	4,222
511	Newcomerstown	10	8	0	3,882
512	New Concord	13	8	0	2,491
513	Williamsburg	11	8	0	2,490
514	Enon	15	8	0	2,415
515	Utica	12	8	0	2,235
516	Sugarcreek	11	8	0	2,220
517	Columbus Grove	13	8	0	2,137
518	Washington Court House	14	8	0	1,997
519	Mechanicsburg	17	8	0	1,644
520	Powhatan Point	14	8	0	1,592
521	Deshler	10	8	0	1,588
522	Burton	11	8	0	1,520
523	Belle Valley	11	8	0	1,368
524	Tuscarawas	9	8	0	1,056
525	Ottoville	12	8	0	976
526	Bloomville	13	8	0	956
527	Waynesburg	11	8	0	928
528	West Farmington	12	8	0	908
529	New Matamoras	10	8	0	896
530	Syracuse	13	8	0	826
531	Killbuck	10	8	0	817
532	Edon	11	8	0	812
533	Baltic	9	8	0	795
534	Mcguffey	12	8	0	710
535	Republic	10	8	0	550
536	Wooster	12	8	0	480
537	Clarington	11	8	1	384
538	Vanlue	10	8	0	341
539	Martinsburg	11	8	0	233
540	Indianapolis	12	8	0	180
541	Brooklyn	12	8	0	175
542	Harrod	9	8	0	78
543	Moreland Hills	11	8	0	54
544	Lampeter	10	8	0	31
545	Clinton	9	8	0	30
546	Harrisville	9	8	0	0
547	Carroll	13	8	0	0
548	Marshallville	11	8	0	0
549	Fairfield	22	7	0	62,447
550	Huber Heights	18	7	0	43,439
551	Heath	9	7	0	10,310
552	Crestline	11	7	0	4,630
553	Lexington	9	7	0	4,320
554	Minerva	10	7	0	4,000
555	Glendale	15	7	0	2,500
556	Leipsic	10	7	0	2,403
557	Spencerville	10	7	0	2,223
558	South Bloomfield	10	7	0	1,999
559	Archbold	10	7	0	1,335
560	Gnadenhutten	9	7	0	1,240
561	Pleasantville	10	7	0	960
562	Sherwood	9	7	0	854
563	Mogadore	9	7	0	495
564	Hayesville	10	7	0	448
565	South Solon	11	7	0	395
566	Glenmont	11	7	0	280
567	Constantine	10	7	0	180
568	Austin	10	7	0	122
569	St. Petersburg	9	7	0	53
570	Rittman	10	7	0	25
571	Green	10	7	2	19
572	Fredericksburg	12	7	0	0
573	Butler	10	7	0	0
574	Hartville	11	7	0	0
575	Minster	10	6	0	2,850
576	Berlin	11	6	0	1,896
577	Pomeroy	11	6	0	1,800
578	Hiram	10	6	0	1,406
579	San Diego	7	6	0	332
580	Newbury	9	6	0	235
581	Big Prairie	7	6	0	197
582	Dalton	10	6	0	119
583	Columus	11	6	0	78
584	Hinckley	10	6	0	58
585	Berlin	8	6	0	50
586	Cloverdale	8	6	0	40
587	Kinsman	8	6	0	39
588	Clearwater	9	6	0	30
589	Huntsville	9	6	0	0
590	Laura	9	6	0	0
591	New Lebanon	11	6	0	0
592	Ashville	11	5	0	4,298
593	Midvale	7	5	0	2,147
594	Mantua	7	5	0	574
595	Akron	8	5	0	370
596	Bowersville	11	5	0	360
597	Gilbert	9	5	0	300
598	Erlanger	10	5	0	230
599	Botkins	6	5	0	200
600	San Francisco	7	5	0	150
601	Scott	10	5	0	98
602	Strongsville	10	5	0	96
603	Kenton	9	5	0	67
604	Beloit	7	5	0	41
605	Independence	8	5	0	32
606	Bellville	9	4	0	1,100
607	Corona Del Mar	7	4	0	475
608	Minneapolis	7	4	0	435
609	Birmingham	6	4	0	280
610	Bethlehem	6	4	0	95
611	Rocky Point	6	4	0	50
612	Lewis Center	10	4	0	27
613	Mount Vernon	9	3	0	16,990
614	St Marys	9	3	0	9,356
615	Zaleski	5	3	0	360
616	Advance	5	3	0	354
617	Thompson	5	3	0	180
618	Clinton Township	8	3	0	158
619	Clinton Twp	9	3	0	150
620	Lake Success	5	3	0	100
621	Bellflower	3	3	0	95
622	Sardis	6	2	0	1,301
623	Westborough	5	2	0	154
624	Royal Oak	6	2	0	120
625	Huntsburg	4	2	0	0
626	Fort Recovery	5	1	0	1,501
627	Warsaw	7	1	0	782
628	Doylestown	4	1	0	300
629	Northfield	3	1	0	250
630	Colorado Springs	3	1	0	100
631	Bradford	5	1	0	85
632	West Salem	2	1	0	85
633	Fowler	5	1	0	69
634	Perrysburg	2	0	0	272
635	Dublin	2	0	0	216
636	Peninsula	2	0	0	136

Recommended Filtration for Ohio

Based on the most common contaminants found across Ohio (Chloroform, Bromodichloromethane, 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 Ohio 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 Ohio tap water safe to drink?

Water quality varies significantly across Ohio. Of the 636 cities analyzed, the average city has 10.5 contaminants above EWG health guidelines. The best water quality was found in Perrysburg. We recommend checking your specific city's report for detailed information.

What city has the best water in Ohio?

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

What city has the worst water in Ohio?

Based on our analysis, South Lebanon has the most contaminants above EWG health guidelines in Ohio, with 17 above guideline levels.

What's the best water filter for Ohio residents?

For most Ohio 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.

Ohio Water Quality Report (2026)