Worst Infrastructure: Arizona — 2026 Rankings

Out of 552 ZIP codes with infrastructure data in Arizona, these areas face the highest estimated risk of water pipe failure based on infrastructure age, funding gaps, and violation history.

Statistic	Value
ZIP codes ranked	552
Highest risk	59%
Median risk	34%
Average risk	35%
State	Arizona

Top 100 Highest Risk ZIP Codes

Rank	ZIP Code	City	State	Pipe Failure Risk	Risk Level	Safety Score
1	85231	Eloy	AZ	59%	High	78/100
2	85272	Stanfield	AZ	59%	High	50/100
3	86331	Jerome	AZ	59%	High	59/100
4	86339	Sedona	AZ	59%	High	79/100
5	86340	Sedona	AZ	59%	High	80/100
6	86341	Sedona	AZ	59%	High	79/100
7	86446	Mohave Valley	AZ	59%	High	74/100
8	85135	Hayden	AZ	57%	High	48/100
9	85328	Cibola	AZ	55%	High	58/100
10	85532	Claypool	AZ	54%	High	63/100
11	85607	Douglas	AZ	54%	High	76/100
12	85137	Kearny	AZ	53%	High	70/100
13	85191	Valley Farms	AZ	53%	High	63/100
14	85352	Tacna	AZ	53%	High	58/100
15	85707	Tucson	AZ	53%	High	50/100
16	85232	Florence	AZ	52%	High	78/100
17	85279	Florence	AZ	52%	High	78/100
18	85603	Bisbee	AZ	52%	High	76/100
19	85654	Rillito	AZ	52%	High	65/100
20	85173	Superior	AZ	51%	High	81/100
21	85299	Gilbert	AZ	51%	High	67/100
22	85366	Yuma	AZ	51%	High	59/100
23	85369	Yuma	AZ	51%	High	59/100
24	85633	Sasabe	AZ	51%	High	80/100
25	85172	Stanfield	AZ	50%	High	50/100
26	85543	Pima	AZ	50%	High	54/100
27	85618	Mammoth	AZ	50%	High	54/100
28	86052	North Rim	AZ	50%	High	53/100
29	85006	Phoenix	AZ	49%	High	58/100
30	85533	Clifton	AZ	49%	High	49/100
31	85632	San Simon	AZ	49%	High	58/100
32	85007	Phoenix	AZ	48%	High	53/100
33	85257	Scottsdale	AZ	48%	High	77/100
34	85531	Central	AZ	48%	High	53/100
35	85551	Solomon	AZ	48%	High	53/100
36	85621	Nogales	AZ	48%	High	63/100
37	86336	Sedona	AZ	48%	High	70/100
38	85009	Phoenix	AZ	47%	High	53/100
39	85117	Apache Junction	AZ	47%	High	72/100
40	85178	Apache Junction	AZ	47%	High	72/100
41	85218	Apache Junction	AZ	47%	High	72/100
42	85220	Apache Junction	AZ	47%	High	74/100
43	85250	Scottsdale	AZ	47%	High	77/100
44	85608	Douglas	AZ	47%	High	74/100
45	85610	Elfrida	AZ	47%	High	66/100
46	85628	Nogales	AZ	47%	High	68/100
47	85655	Douglas	AZ	47%	High	74/100
48	85662	Nogales	AZ	47%	High	71/100
49	85902	Show Low	AZ	47%	High	77/100
50	86430	Bullhead City	AZ	47%	High	82/100
51	86439	Bullhead City	AZ	47%	High	82/100
52	86440	Mohave Valley	AZ	47%	High	69/100
53	86555	Douglas	AZ	47%	High	74/100
54	85015	Phoenix	AZ	46%	High	48/100
55	85019	Phoenix	AZ	46%	High	53/100
56	85031	Phoenix	AZ	46%	High	48/100
57	85321	Ajo	AZ	46%	High	75/100
58	85534	Duncan	AZ	46%	High	74/100
59	85701	Tucson	AZ	46%	High	58/100
60	86029	Sun Valley	AZ	46%	High	69/100
61	86030	Hotevilla	AZ	46%	High	53/100
62	86343	Crown King	AZ	46%	High	77/100
63	85013	Phoenix	AZ	45%	High	48/100
64	85017	Phoenix	AZ	45%	High	53/100
65	85051	Phoenix	AZ	45%	High	53/100
66	85341	Lukeville	AZ	45%	High	53/100
67	85364	Yuma	AZ	45%	High	54/100
68	85501	Globe	AZ	45%	High	77/100
69	85631	San Manuel	AZ	45%	High	82/100
70	85716	Tucson	AZ	45%	High	53/100
71	85938	Springerville	AZ	45%	High	45/100
72	86025	Holbrook	AZ	45%	High	76/100
73	86351	Sedona	AZ	45%	High	80/100
74	85014	Phoenix	AZ	44%	High	48/100
75	85018	Phoenix	AZ	44%	High	48/100
76	85028	Phoenix	AZ	44%	High	58/100
77	85029	Phoenix	AZ	44%	High	53/100
78	85033	Phoenix	AZ	44%	High	53/100
79	85203	Mesa	AZ	44%	High	67/100
80	85223	Arizona City	AZ	44%	High	48/100
81	85237	Kearny	AZ	44%	High	65/100
82	85251	Scottsdale	AZ	44%	High	72/100
83	85351	Sun City	AZ	44%	High	76/100
84	85544	Pine	AZ	44%	High	57/100
85	85546	Safford	AZ	44%	High	68/100
86	85548	Safford	AZ	44%	High	68/100
87	85711	Tucson	AZ	44%	High	58/100
88	85929	Lakeside	AZ	44%	High	75/100
89	85003	Phoenix	AZ	43%	High	58/100
90	85021	Phoenix	AZ	43%	High	48/100
91	85053	Phoenix	AZ	43%	High	50/100
92	85131	Eloy	AZ	43%	High	79/100
93	85202	Mesa	AZ	43%	High	72/100
94	85358	Wickenburg	AZ	43%	High	81/100
95	85371	Poston	AZ	43%	High	53/100
96	85539	Miami	AZ	43%	High	82/100
97	85540	Morenci	AZ	43%	High	67/100
98	85624	Patagonia	AZ	43%	High	82/100
99	85714	Tucson	AZ	43%	High	58/100
100	85719	Tucson	AZ	43%	High	53/100

Methodology

Infrastructure risk rankings combine four data sources, each weighted equally (25%): (1) EPA Drinking Water Infrastructure Needs Survey (DWINS 2023) — state-level 20-year funding gap per capita for pipe replacement, treatment, and storage; (2) Census ACS housing vintage — percentage of homes built before 1980, when lead solder and galvanized pipes were common; (3) EPA SDWIS violation and enforcement data — system-level compliance history; (4) Lead and Copper Rule indicators — service line material inventories and 90th percentile lead testing results. The combined score is normalized to a 0-100% probability scale.

Data sources: EPA DWINS 2023, Census ACS, EPA SDWIS, Lead and Copper Rule data. Last updated: 2026-07-19.

Frequently Asked Questions

What does pipe failure probability mean?

Pipe failure probability estimates the likelihood of water main breaks, lead contamination from corroded pipes, or service disruptions based on infrastructure age, state funding gaps, violation history, and lead indicators. It is not a prediction of imminent failure, but a risk assessment based on known factors.

How is infrastructure risk calculated?

The risk score combines four equally weighted factors: state-level infrastructure funding gap per capita (from EPA DWINS 2023), housing vintage (Census ACS pre-1980 housing percentage), water system violation and enforcement history (EPA SDWIS), and lead exposure indicators (service line probability and testing results).

What can homeowners do about aging infrastructure?

Test your tap water annually, especially for lead. Check if your home has a lead service line through your water utility. Consider a whole-house water filter (NSF/ANSI 53 certified). Review your water system Consumer Confidence Report for violation history.

Does high risk mean my water is unsafe right now?

Not necessarily. Infrastructure risk indicates long-term vulnerability, not current contamination. However, areas with aging pipes and high violation counts have a statistically higher chance of water quality issues. Regular testing is the best way to verify your water safety.