Least Reliable Water Systems in Nevada — 2026

Out of 254 ZIP codes with data in Nevada, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Nevada Rankings

Statistic	Value
ZIP codes ranked	254
Lowest value	19/100
Median value	65/100
State	Nevada

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Reliability Score	Safety Score
1	89310	Austin	NV	19/100	56/100
2	89820	Battle Mountain	NV	21/100	61/100
3	89013	Goldfield	NV	32/100	79/100
4	89448	Zephyr Cove	NV	33/100	63/100
5	89101	Las Vegas	NV	42/100	86/100
6	89102	Las Vegas	NV	42/100	86/100
7	89103	Las Vegas	NV	42/100	86/100
8	89104	Las Vegas	NV	42/100	86/100
9	89105	Las Vegas	NV	42/100	94/100
10	89106	Las Vegas	NV	42/100	86/100
11	89107	Las Vegas	NV	42/100	91/100
12	89108	Las Vegas	NV	42/100	86/100
13	89109	Las Vegas	NV	42/100	86/100
14	89110	Las Vegas	NV	42/100	86/100
15	89111	Las Vegas	NV	42/100	94/100
16	89112	Las Vegas	NV	42/100	94/100
17	89113	Las Vegas	NV	42/100	86/100
18	89114	Las Vegas	NV	42/100	91/100
19	89115	Las Vegas	NV	42/100	91/100
20	89116	Las Vegas	NV	42/100	94/100
21	89117	Las Vegas	NV	42/100	86/100
22	89118	Las Vegas	NV	42/100	86/100
23	89119	Las Vegas	NV	42/100	91/100
24	89120	Las Vegas	NV	42/100	86/100
25	89121	Las Vegas	NV	42/100	91/100
26	89122	Las Vegas	NV	42/100	86/100
27	89123	Las Vegas	NV	42/100	86/100
28	89124	Las Vegas	NV	42/100	86/100
29	89125	Las Vegas	NV	42/100	91/100
30	89126	Las Vegas	NV	42/100	94/100
31	89127	Las Vegas	NV	42/100	94/100
32	89128	Las Vegas	NV	42/100	91/100
33	89129	Las Vegas	NV	42/100	91/100
34	89130	Las Vegas	NV	42/100	86/100
35	89131	Las Vegas	NV	42/100	91/100
36	89132	Las Vegas	NV	42/100	94/100
37	89133	Las Vegas	NV	42/100	94/100
38	89134	Las Vegas	NV	42/100	91/100
39	89135	Las Vegas	NV	42/100	94/100
40	89136	Las Vegas	NV	42/100	94/100
41	89137	Las Vegas	NV	42/100	94/100
42	89138	Las Vegas	NV	42/100	94/100
43	89139	Las Vegas	NV	42/100	91/100
44	89140	Las Vegas	NV	42/100	94/100
45	89141	Las Vegas	NV	42/100	94/100
46	89142	Las Vegas	NV	42/100	86/100
47	89143	Las Vegas	NV	42/100	94/100
48	89144	Las Vegas	NV	42/100	94/100
49	89145	Las Vegas	NV	42/100	94/100
50	89146	Las Vegas	NV	42/100	91/100
51	89147	Las Vegas	NV	42/100	91/100
52	89148	Las Vegas	NV	42/100	91/100
53	89149	Las Vegas	NV	42/100	91/100
54	89150	Las Vegas	NV	42/100	94/100
55	89151	Las Vegas	NV	42/100	94/100
56	89152	Las Vegas	NV	42/100	94/100
57	89153	Las Vegas	NV	42/100	94/100
58	89154	Las Vegas	NV	42/100	94/100
59	89155	Las Vegas	NV	42/100	94/100
60	89156	Las Vegas	NV	42/100	91/100
61	89157	Las Vegas	NV	42/100	94/100
62	89158	Las Vegas	NV	42/100	94/100
63	89159	Las Vegas	NV	42/100	94/100
64	89160	Las Vegas	NV	42/100	94/100
65	89161	Las Vegas	NV	42/100	91/100
66	89162	Las Vegas	NV	42/100	94/100
67	89164	Las Vegas	NV	42/100	94/100
68	89165	Las Vegas	NV	42/100	91/100
69	89166	Las Vegas	NV	42/100	94/100
70	89169	Las Vegas	NV	42/100	91/100
71	89170	Las Vegas	NV	42/100	94/100
72	89173	Las Vegas	NV	42/100	94/100
73	89177	Las Vegas	NV	42/100	94/100
74	89178	Las Vegas	NV	42/100	91/100
75	89179	Las Vegas	NV	42/100	94/100
76	89180	Las Vegas	NV	42/100	94/100
77	89183	Las Vegas	NV	42/100	91/100
78	89185	Las Vegas	NV	42/100	94/100
79	89193	Las Vegas	NV	42/100	94/100
80	89195	Las Vegas	NV	42/100	94/100
81	89199	Las Vegas	NV	42/100	94/100
82	89001	Alamo	NV	45/100	56/100
83	89054	Sloan	NV	46/100	92/100
84	89191	Nellis Afb	NV	47/100	89/100
85	89316	Eureka	NV	47/100	69/100
86	89005	Boulder City	NV	50/100	85/100
87	89006	Boulder City	NV	50/100	89/100
88	89018	Indian Springs	NV	50/100	97/100
89	89025	Moapa	NV	50/100	93/100
90	89040	Overton	NV	50/100	83/100
91	89041	Pahrump	NV	50/100	81/100
92	89043	Pioche	NV	50/100	59/100
93	89048	Pahrump	NV	50/100	71/100
94	89060	Pahrump	NV	50/100	76/100
95	89061	Pahrump	NV	50/100	81/100
96	89070	Indian Springs	NV	50/100	97/100
97	89406	Fallon	NV	50/100	81/100
98	89407	Fallon	NV	50/100	81/100
99	89412	Gerlach	NV	50/100	68/100
100	89496	Fallon	NV	50/100	81/100

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.