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	89106	Las Vegas	NV	42/100	86/100
10	89107	Las Vegas	NV	42/100	91/100
11	89108	Las Vegas	NV	42/100	86/100
12	89109	Las Vegas	NV	42/100	86/100
13	89110	Las Vegas	NV	42/100	86/100
14	89113	Las Vegas	NV	42/100	86/100
15	89115	Las Vegas	NV	42/100	91/100
16	89117	Las Vegas	NV	42/100	86/100
17	89118	Las Vegas	NV	42/100	86/100
18	89119	Las Vegas	NV	42/100	91/100
19	89120	Las Vegas	NV	42/100	86/100
20	89121	Las Vegas	NV	42/100	91/100
21	89122	Las Vegas	NV	42/100	86/100
22	89123	Las Vegas	NV	42/100	86/100
23	89124	Las Vegas	NV	42/100	86/100
24	89128	Las Vegas	NV	42/100	91/100
25	89129	Las Vegas	NV	42/100	91/100
26	89130	Las Vegas	NV	42/100	86/100
27	89131	Las Vegas	NV	42/100	91/100
28	89134	Las Vegas	NV	42/100	91/100
29	89135	Las Vegas	NV	42/100	94/100
30	89138	Las Vegas	NV	42/100	94/100
31	89139	Las Vegas	NV	42/100	91/100
32	89141	Las Vegas	NV	42/100	94/100
33	89142	Las Vegas	NV	42/100	86/100
34	89143	Las Vegas	NV	42/100	94/100
35	89144	Las Vegas	NV	42/100	94/100
36	89145	Las Vegas	NV	42/100	94/100
37	89146	Las Vegas	NV	42/100	91/100
38	89147	Las Vegas	NV	42/100	91/100
39	89148	Las Vegas	NV	42/100	91/100
40	89149	Las Vegas	NV	42/100	91/100
41	89156	Las Vegas	NV	42/100	91/100
42	89158	Las Vegas	NV	42/100	94/100
43	89161	Las Vegas	NV	42/100	91/100
44	89166	Las Vegas	NV	42/100	94/100
45	89169	Las Vegas	NV	42/100	91/100
46	89178	Las Vegas	NV	42/100	91/100
47	89179	Las Vegas	NV	42/100	94/100
48	89183	Las Vegas	NV	42/100	91/100
49	89001	Alamo	NV	45/100	56/100
50	89054	Sloan	NV	46/100	92/100
51	89191	Nellis Afb	NV	47/100	89/100
52	89316	Eureka	NV	47/100	69/100
53	89005	Boulder City	NV	50/100	85/100
54	89018	Indian Springs	NV	50/100	97/100
55	89025	Moapa	NV	50/100	93/100
56	89040	Overton	NV	50/100	83/100
57	89043	Pioche	NV	50/100	59/100
58	89048	Pahrump	NV	50/100	71/100
59	89060	Pahrump	NV	50/100	76/100
60	89061	Pahrump	NV	50/100	81/100
61	89070	Indian Springs	NV	50/100	97/100
62	89406	Fallon	NV	50/100	81/100
63	89412	Gerlach	NV	50/100	68/100
64	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.