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	82331	Saratoga	WY	39/100	65/100
16	82712	Beulah	WY	39/100	45/100
17	82323	Dixon	WY	40/100	50/100
18	82836	Dayton	WY	40/100	60/100
19	83122	Grover	WY	40/100	60/100
20	82934	Granger	WY	41/100	59/100
21	82513	Dubois	WY	42/100	66/100
22	82426	Greybull	WY	45/100	66/100
23	83114	Cokeville	WY	46/100	62/100
24	83127	Thayne	WY	46/100	67/100
25	82324	Elk Mountain	WY	47/100	69/100
26	82433	Meeteetse	WY	47/100	61/100
27	82723	Osage	WY	47/100	82/100
28	82834	Buffalo	WY	48/100	63/100
29	83128	Alpine	WY	50/100	58/100
30	83110	Afton	WY	52/100	66/100
31	82201	Wheatland	WY	54/100	78/100
32	82213	Glendo	WY	55/100	79/100
33	82442	Ten Sleep	WY	55/100	68/100
34	83111	Auburn	WY	55/100	61/100
35	83124	Opal	WY	55/100	64/100
36	82082	Pine Bluffs	WY	56/100	61/100
37	82001	Cheyenne	WY	57/100	34/100
38	82007	Cheyenne	WY	57/100	39/100
39	82009	Cheyenne	WY	57/100	34/100
40	82520	Lander	WY	57/100	69/100
41	82721	Moorcroft	WY	57/100	61/100
42	83014	Wilson	WY	57/100	69/100
43	82649	Shoshoni	WY	58/100	64/100
44	82411	Burlington	WY	59/100	64/100
45	82083	Rock River	WY	60/100	64/100
46	82214	Guernsey	WY	60/100	80/100
47	82240	Torrington	WY	60/100	56/100
48	82322	Bairoil	WY	60/100	65/100
49	82420	Cowley	WY	60/100	63/100
50	82423	Frannie	WY	60/100	64/100
51	82443	Thermopolis	WY	60/100	66/100
52	82941	Pinedale	WY	60/100	63/100
53	82644	Mills	WY	61/100	67/100
54	82054	Carpenter	WY	62/100	65/100
55	82210	Chugwater	WY	62/100	72/100
56	82432	Manderson	WY	62/100	49/100
57	82801	Sheridan	WY	64/100	43/100
58	83112	Bedford	WY	64/100	64/100
59	82055	Centennial	WY	65/100	65/100
60	82212	Fort Laramie	WY	65/100	66/100
61	82244	Yoder	WY	65/100	70/100
62	82430	Kirby	WY	65/100	66/100
63	82633	Douglas	WY	65/100	68/100
64	82635	Edgerton	WY	65/100	66/100
65	82639	Kaycee	WY	65/100	69/100
66	82727	Rozet	WY	65/100	68/100
67	83118	Etna	WY	65/100	64/100
68	83120	Freedom	WY	65/100	69/100
69	82410	Basin	WY	67/100	69/100
70	82937	Lyman	WY	67/100	65/100
71	82939	Mountain View	WY	67/100	69/100
72	83001	Jackson	WY	67/100	64/100
73	82401	Worland	WY	70/100	69/100
74	82414	Cody	WY	70/100	64/100
75	82636	Evansville	WY	70/100	67/100
76	82716	Gillette	WY	70/100	61/100
77	82718	Gillette	WY	70/100	66/100
78	82935	Green River	WY	70/100	69/100
79	83012	Moose	WY	70/100	64/100
80	83025	Teton Village	WY	70/100	70/100
81	82223	Lingle	WY	73/100	69/100
82	82227	Manville	WY	73/100	64/100
83	82325	Encampment	WY	73/100	66/100
84	82329	Medicine Bow	WY	73/100	32/100
85	82334	Sinclair	WY	73/100	65/100
86	82428	Hyattville	WY	73/100	66/100
87	82435	Powell	WY	73/100	70/100
88	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.