Least Reliable Water Systems in Ohio — 2026

Out of 1,453 ZIP codes with data in Ohio, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Ohio Rankings

Statistic	Value
ZIP codes ranked	1,453
Lowest value	15/100
Median value	65/100
State	Ohio

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Reliability Score	Safety Score
1	43524	Hamler	OH	15/100	58/100
2	43791	White Cottage	OH	15/100	32/100
3	43907	Cadiz	OH	15/100	49/100
4	45764	Nelsonville	OH	15/100	53/100
5	43943	Rayland	OH	16/100	54/100
6	45369	South Vienna	OH	20/100	48/100
7	45068	Waynesville	OH	21/100	56/100
8	43724	Caldwell	OH	24/100	57/100
9	43952	Steubenville	OH	24/100	60/100
10	43953	Steubenville	OH	24/100	65/100
11	44644	Malvern	OH	24/100	57/100
12	44807	Attica	OH	24/100	62/100
13	45347	New Paris	OH	24/100	57/100
14	43764	New Lexington	OH	25/100	45/100
15	44491	West Farmington	OH	25/100	78/100
16	43331	Lakeview	OH	27/100	61/100
17	43347	Rushsylvania	OH	27/100	69/100
18	43913	Brilliant	OH	27/100	64/100
19	44690	Winesburg	OH	27/100	65/100
20	45144	Manchester	OH	27/100	56/100
21	45769	Pomeroy	OH	27/100	69/100
22	45786	Waterford	OH	27/100	74/100
23	45886	Scott	OH	27/100	61/100
24	44611	Big Prairie	OH	29/100	49/100
25	43153	South Solon	OH	30/100	49/100
26	43920	East Liverpool	OH	30/100	58/100
27	44309	Akron	OH	30/100	62/100
28	44315	Akron	OH	30/100	58/100
29	44316	Akron	OH	30/100	58/100
30	44317	Akron	OH	30/100	58/100
31	44322	Akron	OH	30/100	58/100
32	44326	Akron	OH	30/100	58/100
33	44328	Akron	OH	30/100	58/100
34	44372	Akron	OH	30/100	58/100
35	44396	Akron	OH	30/100	58/100
36	44398	Akron	OH	30/100	58/100
37	44399	Akron	OH	30/100	58/100
38	44629	Gnadenhutten	OH	30/100	56/100
39	44672	Sebring	OH	30/100	71/100
40	45308	Bradford	OH	30/100	47/100
41	45690	Waverly	OH	30/100	47/100
42	45711	Amesville	OH	30/100	68/100
43	45865	Minster	OH	30/100	51/100
44	45871	New Knoxville	OH	30/100	41/100
45	45891	Van Wert	OH	30/100	46/100
46	43150	Rushville	OH	32/100	69/100
47	43430	Genoa	OH	32/100	82/100
48	43976	Hopedale	OH	32/100	54/100
49	44628	Glenmont	OH	32/100	66/100
50	45621	Coalton	OH	32/100	66/100
51	45723	Coolville	OH	32/100	69/100
52	45760	Middleport	OH	32/100	74/100
53	44688	Waynesburg	OH	34/100	60/100
54	43311	Bellefontaine	OH	35/100	62/100
55	43973	Freeport	OH	35/100	58/100
56	43986	Jewett	OH	35/100	56/100
57	44022	Chagrin Falls	OH	35/100	70/100
58	44023	Chagrin Falls	OH	35/100	75/100
59	44131	Independence	OH	35/100	56/100
60	44444	Newton Falls	OH	35/100	72/100
61	45338	Lewisburg	OH	35/100	62/100
62	43713	Barnesville	OH	37/100	61/100
63	43985	Holloway	OH	37/100	61/100
64	43988	Scio	OH	37/100	66/100
65	44236	Hudson	OH	37/100	59/100
66	44237	Hudson	OH	37/100	65/100
67	45152	Morrow	OH	37/100	61/100
68	45644	Kingston	OH	37/100	59/100
69	45779	Syracuse	OH	37/100	82/100
70	43001	Alexandria	OH	40/100	64/100
71	43107	Bremen	OH	40/100	47/100
72	43143	Mount Sterling	OH	40/100	64/100
73	43144	Murray City	OH	40/100	74/100
74	43526	Hicksville	OH	40/100	77/100
75	43527	Holgate	OH	40/100	63/100
76	43565	Tontogany	OH	40/100	68/100
77	43567	Wauseon	OH	40/100	65/100
78	43759	Morristown	OH	40/100	51/100
79	43766	New Straitsville	OH	40/100	77/100
80	43912	Bridgeport	OH	40/100	54/100
81	44050	Lagrange	OH	40/100	73/100
82	44288	Windham	OH	40/100	69/100
83	44408	Columbiana	OH	40/100	63/100
84	44610	Berlin	OH	40/100	60/100
85	44615	Carrollton	OH	40/100	60/100
86	44676	Shreve	OH	40/100	63/100
87	45334	Jackson Center	OH	40/100	64/100
88	45354	Phillipsburg	OH	40/100	62/100
89	45373	Troy	OH	40/100	53/100
90	45374	Troy	OH	40/100	59/100
91	45390	Union City	OH	40/100	64/100
92	45740	Jacksonville	OH	40/100	79/100
93	45830	Columbus Grove	OH	40/100	68/100
94	43162	West Jefferson	OH	42/100	66/100
95	43326	Kenton	OH	42/100	64/100
96	43416	Elmore	OH	42/100	71/100
97	43752	Laings	OH	42/100	82/100
98	43971	Yorkville	OH	42/100	64/100
99	44065	Newbury	OH	42/100	82/100
100	44084	Rock Creek	OH	42/100	79/100

Methodology

Water system reliability scores (0-100) combine violation frequency, violation recency, resolution rate, and system size. Systems with repeated health-based violations and unresolved issues score lowest. The reliability score focuses specifically on the water utility performance, distinct from the broader Home Safety Score.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-06-04.

Frequently Asked Questions

What does a low water reliability score mean?

A low reliability score (below 50) indicates a water system with frequent violations, poor resolution rates, or recurring compliance issues. These systems may have aging infrastructure, inadequate treatment, or management challenges.

How is reliability different from safety score?

The reliability score focuses specifically on the water utility performance (violations, resolution, compliance). The Home Safety Score is broader, also including lead risk, radon, and flood data. A ZIP code can have a reliable water system but still have high radon or flood risk.