Least Reliable Water Systems in Utah — 2026

Out of 347 ZIP codes with data in Utah, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Utah Rankings

Statistic	Value
ZIP codes ranked	347
Lowest value	10/100
Median value	75/100
State	Utah

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Reliability Score	Safety Score
1	84049	Midway	UT	10/100	58/100
2	84317	Huntsville	UT	10/100	43/100
3	84624	Delta	UT	15/100	67/100
4	84635	Hinckley	UT	15/100	58/100
5	84018	Croydon	UT	22/100	82/100
6	84626	Elberta	UT	23/100	67/100
7	84013	Cedar Valley	UT	25/100	62/100
8	84313	Grouse Creek	UT	25/100	60/100
9	84744	Koosharem	UT	25/100	50/100
10	84036	Kamas	UT	27/100	82/100
11	84632	Fountain Green	UT	30/100	54/100
12	84657	Sigurd	UT	30/100	47/100
13	84761	Parowan	UT	30/100	65/100
14	84072	Tabiona	UT	32/100	61/100
15	84337	Tremonton	UT	35/100	74/100
16	84710	Alton	UT	36/100	79/100
17	84066	Roosevelt	UT	37/100	68/100
18	84070	Sandy	UT	37/100	82/100
19	84090	Sandy	UT	37/100	82/100
20	84091	Sandy	UT	37/100	82/100
21	84092	Sandy	UT	37/100	82/100
22	84093	Sandy	UT	37/100	82/100
23	84094	Sandy	UT	37/100	82/100
24	84520	East Carbon	UT	37/100	65/100
25	84086	Woodruff	UT	39/100	81/100
26	84621	Axtell	UT	39/100	56/100
27	84004	Alpine	UT	40/100	79/100
28	84512	Bluff	UT	40/100	73/100
29	84640	Lynndyl	UT	40/100	79/100
30	84784	Hildale	UT	40/100	77/100
31	84312	Garland	UT	43/100	75/100
32	84080	Vernon	UT	45/100	81/100
33	84310	Eden	UT	45/100	79/100
34	84530	La Sal	UT	45/100	70/100
35	84633	Goshen	UT	45/100	70/100
36	84636	Holden	UT	45/100	81/100
37	84775	Torrey	UT	45/100	76/100
38	84535	Monticello	UT	47/100	82/100
39	84725	Enterprise	UT	47/100	82/100
40	84749	Lyman	UT	47/100	82/100
41	84743	Kingston	UT	48/100	62/100
42	84308	Cornish	UT	49/100	81/100
43	84511	Blanding	UT	49/100	81/100
44	84772	Summit	UT	49/100	77/100
45	84009	South Jordan	UT	50/100	77/100
46	84095	South Jordan	UT	50/100	77/100
47	84305	Clarkston	UT	50/100	81/100
48	84630	Fayette	UT	50/100	60/100
49	84642	Manti	UT	50/100	68/100
50	84655	Santaquin	UT	50/100	81/100
51	84718	Cannonville	UT	50/100	78/100
52	84722	Central	UT	50/100	68/100
53	84754	Monroe	UT	50/100	68/100
54	84038	Laketown	UT	52/100	82/100
55	84328	Paradise	UT	52/100	63/100
56	84338	Trenton	UT	52/100	82/100
57	84637	Kanosh	UT	52/100	82/100
58	84665	Sterling	UT	52/100	65/100
59	84720	Cedar City	UT	52/100	79/100
60	84721	Cedar City	UT	52/100	74/100
61	84763	Rockville	UT	52/100	79/100
62	84713	Beaver	UT	53/100	63/100
63	84745	La Verkin	UT	53/100	79/100
64	84746	Leeds	UT	53/100	57/100
65	84027	Fruitland	UT	55/100	61/100
66	84083	Wendover	UT	55/100	77/100
67	84311	Fielding	UT	55/100	78/100
68	84316	Howell	UT	55/100	81/100
69	84532	Moab	UT	55/100	63/100
70	84714	Beryl	UT	55/100	67/100
71	84715	Bicknell	UT	55/100	59/100
72	84732	Greenwich	UT	55/100	61/100
73	84735	Hatch	UT	55/100	77/100
74	84742	Kanarraville	UT	55/100	76/100
75	84757	New Harmony	UT	55/100	77/100
76	84773	Teasdale	UT	55/100	80/100
77	84783	Dammeron Valley	UT	55/100	78/100
78	84340	Willard	UT	57/100	82/100
79	84662	Spring City	UT	57/100	69/100
80	84025	Farmington	UT	58/100	55/100
81	84061	Peoa	UT	59/100	80/100
82	84001	Altamont	UT	60/100	68/100
83	84021	Duchesne	UT	60/100	68/100
84	84032	Heber City	UT	60/100	80/100
85	84314	Honeyville	UT	60/100	74/100
86	84644	Meadow	UT	60/100	70/100
87	84723	Circleville	UT	60/100	53/100
88	84759	Panguitch	UT	60/100	80/100
89	84765	Santa Clara	UT	60/100	80/100
90	84779	Virgin	UT	60/100	81/100
91	84780	Washington	UT	60/100	73/100
92	84024	Echo	UT	62/100	82/100
93	84528	Huntington	UT	62/100	82/100
94	84601	Provo	UT	62/100	74/100
95	84602	Provo	UT	62/100	78/100
96	84603	Provo	UT	62/100	79/100
97	84604	Provo	UT	62/100	74/100
98	84605	Provo	UT	62/100	78/100
99	84606	Provo	UT	62/100	79/100
100	84656	Scipio	UT	62/100	73/100

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.