Least Reliable Water Systems in Wyoming — 2026

Out of 195 ZIP codes with data in Wyoming, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Wyoming Rankings

Statistic	Value
ZIP codes ranked	195
Lowest value	19/100
Median value	73/100
State	Wyoming

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Reliability Score	Safety Score
1	82945	Superior	WY	19/100	56/100
2	82222	Lance Creek	WY	20/100	13/100
3	82321	Baggs	WY	20/100	30/100
4	83113	Big Piney	WY	22/100	61/100
5	82523	Pavillion	WY	23/100	54/100
6	82501	Riverton	WY	25/100	54/100
7	83101	Kemmerer	WY	25/100	36/100
8	82932	Farson	WY	27/100	65/100
9	82050	Albin	WY	29/100	49/100
10	82301	Rawlins	WY	30/100	62/100
11	82701	Newcastle	WY	30/100	72/100
12	83123	La Barge	WY	34/100	60/100
13	82431	Lovell	WY	35/100	57/100
14	82901	Rock Springs	WY	37/100	64/100
15	82902	Rock Springs	WY	37/100	65/100
16	82331	Saratoga	WY	39/100	65/100
17	82712	Beulah	WY	39/100	45/100
18	82323	Dixon	WY	40/100	50/100
19	82836	Dayton	WY	40/100	60/100
20	83122	Grover	WY	40/100	60/100
21	82934	Granger	WY	41/100	59/100
22	82513	Dubois	WY	42/100	66/100
23	82426	Greybull	WY	45/100	66/100
24	83114	Cokeville	WY	46/100	62/100
25	83127	Thayne	WY	46/100	67/100
26	82324	Elk Mountain	WY	47/100	69/100
27	82433	Meeteetse	WY	47/100	61/100
28	82723	Osage	WY	47/100	82/100
29	82834	Buffalo	WY	48/100	63/100
30	83128	Alpine	WY	50/100	58/100
31	82310	Jeffrey City	WY	52/100	65/100
32	83110	Afton	WY	52/100	66/100
33	83119	Fairview	WY	53/100	56/100
34	82201	Wheatland	WY	54/100	78/100
35	82213	Glendo	WY	55/100	79/100
36	82442	Ten Sleep	WY	55/100	68/100
37	83111	Auburn	WY	55/100	61/100
38	83124	Opal	WY	55/100	64/100
39	82082	Pine Bluffs	WY	56/100	61/100
40	82001	Cheyenne	WY	57/100	34/100
41	82002	Cheyenne	WY	57/100	32/100
42	82003	Cheyenne	WY	57/100	44/100
43	82006	Cheyenne	WY	57/100	32/100
44	82007	Cheyenne	WY	57/100	39/100
45	82008	Cheyenne	WY	57/100	32/100
46	82009	Cheyenne	WY	57/100	34/100
47	82010	Cheyenne	WY	57/100	32/100
48	82520	Lander	WY	57/100	69/100
49	82721	Moorcroft	WY	57/100	61/100
50	83014	Wilson	WY	57/100	69/100
51	82649	Shoshoni	WY	58/100	64/100
52	82411	Burlington	WY	59/100	64/100
53	82083	Rock River	WY	60/100	64/100
54	82214	Guernsey	WY	60/100	80/100
55	82240	Torrington	WY	60/100	56/100
56	82322	Bairoil	WY	60/100	65/100
57	82420	Cowley	WY	60/100	63/100
58	82423	Frannie	WY	60/100	64/100
59	82443	Thermopolis	WY	60/100	66/100
60	82941	Pinedale	WY	60/100	63/100
61	82942	Point Of Rocks	WY	60/100	61/100
62	82644	Mills	WY	61/100	67/100
63	82054	Carpenter	WY	62/100	65/100
64	82210	Chugwater	WY	62/100	72/100
65	82432	Manderson	WY	62/100	49/100
66	82801	Sheridan	WY	64/100	43/100
67	83112	Bedford	WY	64/100	64/100
68	82055	Centennial	WY	65/100	65/100
69	82212	Fort Laramie	WY	65/100	66/100
70	82244	Yoder	WY	65/100	70/100
71	82430	Kirby	WY	65/100	66/100
72	82633	Douglas	WY	65/100	68/100
73	82635	Edgerton	WY	65/100	66/100
74	82639	Kaycee	WY	65/100	69/100
75	82727	Rozet	WY	65/100	68/100
76	83118	Etna	WY	65/100	64/100
77	83120	Freedom	WY	65/100	69/100
78	82410	Basin	WY	67/100	69/100
79	82937	Lyman	WY	67/100	65/100
80	82939	Mountain View	WY	67/100	69/100
81	83001	Jackson	WY	67/100	64/100
82	83002	Jackson	WY	67/100	65/100
83	82401	Worland	WY	70/100	69/100
84	82414	Cody	WY	70/100	64/100
85	82636	Evansville	WY	70/100	67/100
86	82716	Gillette	WY	70/100	61/100
87	82717	Gillette	WY	70/100	66/100
88	82718	Gillette	WY	70/100	66/100
89	82935	Green River	WY	70/100	69/100
90	83012	Moose	WY	70/100	64/100
91	83025	Teton Village	WY	70/100	70/100
92	82223	Lingle	WY	73/100	69/100
93	82227	Manville	WY	73/100	64/100
94	82325	Encampment	WY	73/100	66/100
95	82329	Medicine Bow	WY	73/100	32/100
96	82334	Sinclair	WY	73/100	65/100
97	82428	Hyattville	WY	73/100	66/100
98	82435	Powell	WY	73/100	70/100
99	82058	Garrett	WY	75/100	40/100
100	82063	Jelm	WY	75/100	40/100

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.