Worst Infrastructure: Oklahoma — 2026 Rankings

Out of 770 ZIP codes with infrastructure data in Oklahoma, 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	770
Highest risk	68%
Median risk	47%
Average risk	46%
State	Oklahoma

Top 100 Highest Risk ZIP Codes

Rank	ZIP Code	City	State	Pipe Failure Risk	Risk Level	Safety Score
1	74637	Fairfax	OK	68%	Very High	70/100
2	73565	Ryan	OK	66%	Very High	66/100
3	74035	Hominy	OK	66%	Very High	62/100
4	74058	Pawnee	OK	64%	Very High	70/100
5	73040	Geary	OK	63%	Very High	76/100
6	73737	Fairview	OK	63%	Very High	65/100
7	74003	Bartlesville	OK	63%	Very High	60/100
8	74020	Cleveland	OK	63%	Very High	70/100
9	74546	Haileyville	OK	63%	Very High	89/100
10	74646	Nardin	OK	63%	Very High	66/100
11	73530	Davidson	OK	62%	Very High	75/100
12	73559	Mountain Park	OK	62%	Very High	70/100
13	73566	Snyder	OK	62%	Very High	64/100
14	73568	Temple	OK	62%	Very High	66/100
15	74002	Barnsdall	OK	62%	Very High	68/100
16	74056	Pawhuska	OK	62%	Very High	84/100
17	74631	Blackwell	OK	62%	Very High	55/100
18	73077	Perry	OK	61%	Very High	68/100
19	73647	Foss	OK	61%	Very High	65/100
20	73701	Enid	OK	61%	Very High	83/100
21	74601	Ponca City	OK	61%	Very High	81/100
22	73542	Frederick	OK	60%	High	66/100
23	73550	Hollis	OK	60%	High	65/100
24	73560	Olustee	OK	60%	High	63/100
25	73570	Tipton	OK	60%	High	70/100
26	73573	Waurika	OK	60%	High	62/100
27	73860	Waynoka	OK	60%	High	90/100
28	74401	Muskogee	OK	60%	High	69/100
29	74636	Deer Creek	OK	60%	High	66/100
30	74647	Newkirk	OK	60%	High	83/100
31	74652	Shidler	OK	60%	High	55/100
32	73005	Anadarko	OK	59%	High	62/100
33	73018	Chickasha	OK	59%	High	60/100
34	73024	Corn	OK	59%	High	65/100
35	73033	Eakly	OK	59%	High	55/100
36	73059	Minco	OK	59%	High	61/100
37	73075	Pauls Valley	OK	59%	High	65/100
38	73564	Roosevelt	OK	59%	High	98/100
39	73743	Hillsdale	OK	59%	High	94/100
40	74029	Dewey	OK	59%	High	65/100
41	74084	Wynona	OK	59%	High	97/100
42	74447	Okmulgee	OK	59%	High	65/100
43	74521	Albion	OK	59%	High	66/100
44	74536	Clayton	OK	59%	High	37/100
45	74547	Hartshorne	OK	59%	High	61/100
46	74801	Shawnee	OK	59%	High	60/100
47	74848	Holdenville	OK	59%	High	70/100
48	73107	Oklahoma City	OK	58%	High	91/100
49	73438	Healdton	OK	58%	High	90/100
50	73521	Altus	OK	58%	High	70/100
51	73528	Chattanooga	OK	58%	High	66/100
52	73546	Grandfield	OK	58%	High	55/100
53	73555	Manitou	OK	58%	High	66/100
54	73746	Hopeton	OK	58%	High	66/100
55	74022	Copan	OK	58%	High	68/100
56	74085	Yale	OK	58%	High	66/100
57	74403	Muskogee	OK	58%	High	59/100
58	74538	Coalgate	OK	58%	High	65/100
59	74632	Braman	OK	58%	High	80/100
60	74653	Tonkawa	OK	58%	High	86/100
61	74873	Tecumseh	OK	58%	High	40/100
62	74901	Arkoma	OK	58%	High	86/100
63	73057	Maysville	OK	57%	High	62/100
64	73092	Verden	OK	57%	High	93/100
65	73103	Oklahoma City	OK	57%	High	91/100
66	73118	Oklahoma City	OK	57%	High	81/100
67	73122	Oklahoma City	OK	57%	High	86/100
68	73532	Duke	OK	57%	High	66/100
69	73533	Duncan	OK	57%	High	57/100
70	73537	Eldorado	OK	57%	High	81/100
71	73547	Granite	OK	57%	High	94/100
72	73554	Mangum	OK	57%	High	93/100
73	73641	Dill City	OK	57%	High	73/100
74	73655	Lone Wolf	OK	57%	High	86/100
75	73716	Aline	OK	57%	High	63/100
76	73734	Dover	OK	57%	High	89/100
77	74103	Tulsa	OK	57%	High	91/100
78	74630	Billings	OK	57%	High	73/100
79	74837	Cromwell	OK	57%	High	66/100
80	74884	Wewoka	OK	57%	High	70/100
81	73106	Oklahoma City	OK	56%	High	86/100
82	73531	Devol	OK	56%	High	70/100
83	73622	Bessie	OK	56%	High	99/100
84	73758	Manchester	OK	56%	High	94/100
85	74079	Stroud	OK	56%	High	86/100
86	74352	Locust Grove	OK	56%	High	71/100
87	74437	Henryetta	OK	56%	High	84/100
88	74460	Schulter	OK	56%	High	55/100
89	74528	Blanco	OK	56%	High	73/100
90	74553	Kiowa	OK	56%	High	70/100
91	74571	Talihina	OK	56%	High	70/100
92	74729	Caddo	OK	56%	High	97/100
93	73014	Calumet	OK	55%	High	69/100
94	73036	El Reno	OK	55%	High	69/100
95	73551	Hollister	OK	55%	High	98/100
96	73556	Martha	OK	55%	High	70/100
97	73562	Randlett	OK	55%	High	63/100
98	73571	Vinson	OK	55%	High	66/100
99	73632	Cordell	OK	55%	High	78/100
100	73673	Willow	OK	55%	High	83/100

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.