Worst Infrastructure: Maryland — 2026 Rankings

Out of 465 ZIP codes with infrastructure data in Maryland, 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	465
Highest risk	NaN%
Median risk	NaN%
Average risk	NaN%
State	Maryland

Top 100 Highest Risk ZIP Codes

Rank	ZIP Code	City	State	Pipe Failure Risk	Risk Level	Safety Score
1	20601	Waldorf	MD	NaN%	Unknown	83/100
2	20602	Waldorf	MD	NaN%	Unknown	83/100
3	20603	Waldorf	MD	NaN%	Unknown	83/100
4	20606	Abell	MD	NaN%	Unknown	—
5	20607	Accokeek	MD	NaN%	Unknown	82/100
6	20608	Aquasco	MD	NaN%	Unknown	—
7	20609	Avenue	MD	NaN%	Unknown	—
8	20611	Bel Alton	MD	NaN%	Unknown	—
9	20612	Benedict	MD	NaN%	Unknown	—
10	20613	Brandywine	MD	NaN%	Unknown	82/100
11	20615	Broomes Island	MD	NaN%	Unknown	—
12	20616	Bryans Road	MD	NaN%	Unknown	83/100
13	20617	Bryantown	MD	NaN%	Unknown	—
14	20618	Bushwood	MD	NaN%	Unknown	—
15	20619	California	MD	NaN%	Unknown	—
16	20620	Callaway	MD	NaN%	Unknown	—
17	20621	Chaptico	MD	NaN%	Unknown	—
18	20622	Charlotte Hall	MD	NaN%	Unknown	83/100
19	20623	Cheltenham	MD	NaN%	Unknown	83/100
20	20624	Clements	MD	NaN%	Unknown	—
21	20625	Cobb Island	MD	NaN%	Unknown	—
22	20626	Coltons Point	MD	NaN%	Unknown	—
23	20628	Dameron	MD	NaN%	Unknown	—
24	20629	Dowell	MD	NaN%	Unknown	67/100
25	20630	Drayden	MD	NaN%	Unknown	—
26	20632	Faulkner	MD	NaN%	Unknown	—
27	20634	Great Mills	MD	NaN%	Unknown	—
28	20636	Hollywood	MD	NaN%	Unknown	—
29	20637	Hughesville	MD	NaN%	Unknown	—
30	20639	Huntingtown	MD	NaN%	Unknown	—
31	20640	Indian Head	MD	NaN%	Unknown	83/100
32	20645	Issue	MD	NaN%	Unknown	—
33	20646	La Plata	MD	NaN%	Unknown	81/100
34	20650	Leonardtown	MD	NaN%	Unknown	—
35	20653	Lexington Park	MD	NaN%	Unknown	—
36	20656	Loveville	MD	NaN%	Unknown	—
37	20657	Lusby	MD	NaN%	Unknown	66/100
38	20658	Marbury	MD	NaN%	Unknown	—
39	20659	Mechanicsville	MD	NaN%	Unknown	—
40	20662	Nanjemoy	MD	NaN%	Unknown	—
41	20664	Newburg	MD	NaN%	Unknown	—
42	20667	Park Hall	MD	NaN%	Unknown	—
43	20670	Patuxent River	MD	NaN%	Unknown	—
44	20674	Piney Point	MD	NaN%	Unknown	—
45	20675	Pomfret	MD	NaN%	Unknown	—
46	20676	Port Republic	MD	NaN%	Unknown	—
47	20677	Port Tobacco	MD	NaN%	Unknown	—
48	20678	Prince Frederick	MD	NaN%	Unknown	66/100
49	20680	Ridge	MD	NaN%	Unknown	—
50	20684	Saint Inigoes	MD	NaN%	Unknown	—
51	20685	Saint Leonard	MD	NaN%	Unknown	—
52	20687	Scotland	MD	NaN%	Unknown	—
53	20688	Solomons	MD	NaN%	Unknown	67/100
54	20689	Sunderland	MD	NaN%	Unknown	—
55	20690	Tall Timbers	MD	NaN%	Unknown	—
56	20692	Valley Lee	MD	NaN%	Unknown	—
57	20693	Welcome	MD	NaN%	Unknown	—
58	20695	White Plains	MD	NaN%	Unknown	83/100
59	20701	Annapolis Junction	MD	NaN%	Unknown	—
60	20705	Beltsville	MD	NaN%	Unknown	83/100
61	20706	Lanham	MD	NaN%	Unknown	83/100
62	20707	Laurel	MD	NaN%	Unknown	83/100
63	20708	Laurel	MD	NaN%	Unknown	83/100
64	20710	Bladensburg	MD	NaN%	Unknown	83/100
65	20711	Lothian	MD	NaN%	Unknown	—
66	20712	Mount Rainier	MD	NaN%	Unknown	83/100
67	20714	North Beach	MD	NaN%	Unknown	—
68	20715	Bowie	MD	NaN%	Unknown	82/100
69	20716	Bowie	MD	NaN%	Unknown	82/100
70	20720	Bowie	MD	NaN%	Unknown	82/100
71	20721	Bowie	MD	NaN%	Unknown	83/100
72	20722	Brentwood	MD	NaN%	Unknown	83/100
73	20723	Laurel	MD	NaN%	Unknown	66/100
74	20724	Laurel	MD	NaN%	Unknown	83/100
75	20732	Chesapeake Beach	MD	NaN%	Unknown	65/100
76	20733	Churchton	MD	NaN%	Unknown	—
77	20735	Clinton	MD	NaN%	Unknown	83/100
78	20736	Owings	MD	NaN%	Unknown	—
79	20737	Riverdale	MD	NaN%	Unknown	83/100
80	20740	College Park	MD	NaN%	Unknown	83/100
81	20742	College Park	MD	NaN%	Unknown	83/100
82	20743	Capitol Heights	MD	NaN%	Unknown	83/100
83	20744	Fort Washington	MD	NaN%	Unknown	83/100
84	20745	Oxon Hill	MD	NaN%	Unknown	83/100
85	20746	Suitland	MD	NaN%	Unknown	83/100
86	20747	District Heights	MD	NaN%	Unknown	83/100
87	20748	Temple Hills	MD	NaN%	Unknown	83/100
88	20751	Deale	MD	NaN%	Unknown	—
89	20754	Dunkirk	MD	NaN%	Unknown	—
90	20755	Fort George G Meade	MD	NaN%	Unknown	83/100
91	20758	Friendship	MD	NaN%	Unknown	—
92	20759	Fulton	MD	NaN%	Unknown	—
93	20762	Andrews Air Force Base	MD	NaN%	Unknown	—
94	20763	Savage	MD	NaN%	Unknown	—
95	20764	Shady Side	MD	NaN%	Unknown	—
96	20765	Galesville	MD	NaN%	Unknown	—
97	20769	Glenn Dale	MD	NaN%	Unknown	83/100
98	20770	Greenbelt	MD	NaN%	Unknown	83/100
99	20772	Upper Marlboro	MD	NaN%	Unknown	83/100
100	20774	Upper Marlboro	MD	NaN%	Unknown	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: 2026-08-31.

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.