Least Reliable Water Systems in Utah — 2026

Out of 350 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	350
Lowest value	10/100
Median value	65/100
State	Utah

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Reliability Score	Safety Score
1	84317	Huntsville	UT	10/100	43/100
2	84049	Midway	UT	15/100	58/100
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	84313	Grouse Creek	UT	25/100	60/100
7	84744	Koosharem	UT	25/100	50/100
8	84036	Kamas	UT	27/100	82/100
9	84632	Fountain Green	UT	30/100	54/100
10	84657	Sigurd	UT	30/100	47/100
11	84761	Parowan	UT	30/100	65/100
12	84072	Tabiona	UT	32/100	61/100
13	84312	Garland	UT	35/100	75/100
14	84337	Tremonton	UT	35/100	74/100
15	84710	Alton	UT	36/100	79/100
16	84066	Roosevelt	UT	37/100	68/100
17	84520	East Carbon	UT	37/100	65/100
18	84626	Elberta	UT	38/100	67/100
19	84086	Woodruff	UT	39/100	81/100
20	84621	Axtell	UT	39/100	56/100
21	84013	Cedar Valley	UT	40/100	62/100
22	84512	Bluff	UT	40/100	73/100
23	84640	Lynndyl	UT	40/100	79/100
24	84743	Kingston	UT	40/100	62/100
25	84784	Hildale	UT	40/100	77/100
26	84004	Alpine	UT	45/100	79/100
27	84080	Vernon	UT	45/100	81/100
28	84310	Eden	UT	45/100	79/100
29	84633	Goshen	UT	45/100	70/100
30	84636	Holden	UT	45/100	81/100
31	84644	Meadow	UT	45/100	70/100
32	84713	Beaver	UT	45/100	63/100
33	84745	La Verkin	UT	45/100	79/100
34	84746	Leeds	UT	45/100	57/100
35	84775	Torrey	UT	45/100	76/100
36	84070	Sandy	UT	47/100	82/100
37	84090	Sandy	UT	47/100	82/100
38	84091	Sandy	UT	47/100	82/100
39	84092	Sandy	UT	47/100	82/100
40	84093	Sandy	UT	47/100	82/100
41	84094	Sandy	UT	47/100	82/100
42	84535	Monticello	UT	47/100	82/100
43	84725	Enterprise	UT	47/100	82/100
44	84749	Lyman	UT	47/100	82/100
45	84783	Dammeron Valley	UT	47/100	78/100
46	84308	Cornish	UT	49/100	81/100
47	84511	Blanding	UT	49/100	81/100
48	84772	Summit	UT	49/100	77/100
49	84009	South Jordan	UT	50/100	77/100
50	84073	Talmage	UT	50/100	64/100
51	84095	South Jordan	UT	50/100	77/100
52	84305	Clarkston	UT	50/100	81/100
53	84501	Price	UT	50/100	68/100
54	84530	La Sal	UT	50/100	70/100
55	84642	Manti	UT	50/100	68/100
56	84655	Santaquin	UT	50/100	81/100
57	84718	Cannonville	UT	50/100	78/100
58	84754	Monroe	UT	50/100	68/100
59	84038	Laketown	UT	52/100	82/100
60	84328	Paradise	UT	52/100	63/100
61	84338	Trenton	UT	52/100	82/100
62	84637	Kanosh	UT	52/100	82/100
63	84665	Sterling	UT	52/100	65/100
64	84763	Rockville	UT	52/100	79/100
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	84630	Fayette	UT	55/100	60/100
71	84714	Beryl	UT	55/100	67/100
72	84715	Bicknell	UT	55/100	59/100
73	84722	Central	UT	55/100	68/100
74	84732	Greenwich	UT	55/100	61/100
75	84735	Hatch	UT	55/100	77/100
76	84757	New Harmony	UT	55/100	77/100
77	84773	Teasdale	UT	55/100	80/100
78	84340	Willard	UT	57/100	82/100
79	84662	Spring City	UT	57/100	69/100
80	84061	Peoa	UT	59/100	80/100
81	84001	Altamont	UT	60/100	68/100
82	84021	Duchesne	UT	60/100	68/100
83	84022	Dugway	UT	60/100	53/100
84	84028	Garden City	UT	60/100	83/100
85	84031	Hanna	UT	60/100	40/100
86	84032	Heber City	UT	60/100	80/100
87	84314	Honeyville	UT	60/100	74/100
88	84329	Park Valley	UT	60/100	53/100
89	84403	Ogden	UT	60/100	76/100
90	84510	Aneth	UT	60/100	53/100
91	84513	Castle Dale	UT	60/100	53/100
92	84516	Clawson	UT	60/100	53/100
93	84518	Cleveland	UT	60/100	53/100
94	84521	Elmo	UT	60/100	53/100
95	84523	Ferron	UT	60/100	53/100
96	84531	Mexican Hat	UT	60/100	53/100
97	84534	Montezuma Creek	UT	60/100	53/100
98	84536	Monument Valley	UT	60/100	53/100
99	84537	Orangeville	UT	60/100	63/100
100	84716	Boulder	UT	60/100	83/100

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.