Least Reliable Water Systems in Indiana — 2026

Out of 980 ZIP codes with data in Indiana, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Indiana Rankings

Statistic	Value
ZIP codes ranked	980
Lowest value	15/100
Median value	67/100
State	Indiana

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Reliability Score	Safety Score
1	47283	Westport	IN	15/100	45/100
2	47633	Poseyville	IN	15/100	40/100
3	47862	Montezuma	IN	15/100	50/100
4	47952	Kingman	IN	15/100	33/100
5	46510	Claypool	IN	16/100	61/100
6	46133	Glenwood	IN	21/100	51/100
7	46580	Warsaw	IN	21/100	51/100
8	46581	Warsaw	IN	21/100	61/100
9	46582	Warsaw	IN	21/100	51/100
10	46037	Fishers	IN	24/100	57/100
11	46038	Fishers	IN	24/100	57/100
12	46085	Fishers	IN	24/100	56/100
13	46799	Zanesville	IN	24/100	56/100
14	47172	Sellersburg	IN	24/100	60/100
15	47960	Monticello	IN	24/100	47/100
16	46750	Huntington	IN	25/100	47/100
17	47175	Taswell	IN	27/100	45/100
18	46350	La Porte	IN	29/100	77/100
19	46352	La Porte	IN	29/100	82/100
20	46111	Brooklyn	IN	30/100	65/100
21	46986	Swayzee	IN	30/100	48/100
22	47380	Ridgeville	IN	30/100	55/100
23	47670	Princeton	IN	30/100	64/100
24	47374	Richmond	IN	31/100	53/100
25	47375	Richmond	IN	31/100	58/100
26	47874	Rosedale	IN	31/100	72/100
27	46349	Lake Village	IN	32/100	74/100
28	47123	Grantsburg	IN	32/100	82/100
29	47136	Lanesville	IN	32/100	61/100
30	46104	Arlington	IN	34/100	60/100
31	47024	Laurel	IN	34/100	81/100
32	47265	North Vernon	IN	34/100	68/100
33	47513	Birdseye	IN	34/100	44/100
34	47801	Terre Haute	IN	34/100	77/100
35	47802	Terre Haute	IN	34/100	63/100
36	47803	Terre Haute	IN	34/100	73/100
37	47804	Terre Haute	IN	34/100	73/100
38	47805	Terre Haute	IN	34/100	73/100
39	47807	Terre Haute	IN	34/100	78/100
40	47808	Terre Haute	IN	34/100	78/100
41	47809	Terre Haute	IN	34/100	77/100
42	47811	Terre Haute	IN	34/100	77/100
43	47812	Terre Haute	IN	34/100	77/100
44	47840	Centerpoint	IN	34/100	74/100
45	47993	Williamsport	IN	34/100	68/100
46	47167	Salem	IN	35/100	53/100
47	47401	Bloomington	IN	35/100	48/100
48	47402	Bloomington	IN	35/100	53/100
49	47403	Bloomington	IN	35/100	48/100
50	47404	Bloomington	IN	35/100	53/100
51	47405	Bloomington	IN	35/100	45/100
52	47406	Bloomington	IN	35/100	45/100
53	47407	Bloomington	IN	35/100	45/100
54	47408	Bloomington	IN	35/100	53/100
55	47640	Hazleton	IN	35/100	77/100
56	47974	Perrysville	IN	35/100	42/100
57	47535	Freelandville	IN	36/100	79/100
58	46303	Cedar Lake	IN	37/100	58/100
59	46383	Valparaiso	IN	37/100	71/100
60	46384	Valparaiso	IN	37/100	81/100
61	46385	Valparaiso	IN	37/100	76/100
62	47036	Oldenburg	IN	37/100	82/100
63	47341	Fountain City	IN	37/100	66/100
64	47368	Parker City	IN	37/100	61/100
65	47920	Battle Ground	IN	37/100	51/100
66	46915	Burlington	IN	38/100	61/100
67	47639	Haubstadt	IN	38/100	69/100
68	46793	Waterloo	IN	39/100	75/100
69	47832	Bloomingdale	IN	39/100	77/100
70	46041	Frankfort	IN	40/100	64/100
71	46148	Knightstown	IN	40/100	63/100
72	46201	Indianapolis	IN	40/100	51/100
73	46202	Indianapolis	IN	40/100	56/100
74	46203	Indianapolis	IN	40/100	46/100
75	46204	Indianapolis	IN	40/100	56/100
76	46205	Indianapolis	IN	40/100	46/100
77	46206	Indianapolis	IN	40/100	56/100
78	46207	Indianapolis	IN	40/100	48/100
79	46208	Indianapolis	IN	40/100	51/100
80	46209	Indianapolis	IN	40/100	48/100
81	46211	Indianapolis	IN	40/100	48/100
82	46213	Indianapolis	IN	40/100	48/100
83	46214	Indianapolis	IN	40/100	51/100
84	46216	Indianapolis	IN	40/100	48/100
85	46217	Indianapolis	IN	40/100	46/100
86	46218	Indianapolis	IN	40/100	51/100
87	46219	Indianapolis	IN	40/100	46/100
88	46220	Indianapolis	IN	40/100	41/100
89	46221	Indianapolis	IN	40/100	46/100
90	46222	Indianapolis	IN	40/100	51/100
91	46223	Indianapolis	IN	40/100	48/100
92	46224	Indianapolis	IN	40/100	46/100
93	46225	Indianapolis	IN	40/100	51/100
94	46226	Indianapolis	IN	40/100	46/100
95	46227	Indianapolis	IN	40/100	46/100
96	46228	Indianapolis	IN	40/100	46/100
97	46229	Indianapolis	IN	40/100	51/100
98	46230	Indianapolis	IN	40/100	48/100
99	46231	Indianapolis	IN	40/100	56/100
100	46234	Indianapolis	IN	40/100	51/100

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: 2026-04-13.

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.