Worst Infrastructure: Maine — 2026 Rankings

Out of 472 ZIP codes with infrastructure data in Maine, 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	472
Highest risk	73%
Median risk	42%
Average risk	43%
State	Maine

Top 100 Highest Risk ZIP Codes

Rank	ZIP Code	City	State	Pipe Failure Risk	Risk Level	Safety Score
1	03910	York Beach	ME	73%	Very High	35/100
2	04415	Brownville Junction	ME	69%	Very High	53/100
3	04683	Sunset	ME	65%	Very High	40/100
4	04489	Stillwater	ME	62%	Very High	53/100
5	04227	East Dixfield	ME	61%	Very High	40/100
6	04109	Portland	ME	59%	High	67/100
7	04975	Shawmut	ME	59%	High	40/100
8	04257	Mexico	ME	58%	High	60/100
9	04901	Waterville	ME	58%	High	38/100
10	04903	Waterville	ME	58%	High	39/100
11	04108	Peaks Island	ME	57%	High	45/100
12	04758	Mars Hill	ME	57%	High	51/100
13	04276	Rumford	ME	56%	High	65/100
14	04855	Port Clyde	ME	56%	High	82/100
15	04735	Bridgewater	ME	55%	High	40/100
16	04918	Belgrade Lakes	ME	55%	High	53/100
17	04102	Portland	ME	54%	High	62/100
18	04210	Auburn	ME	54%	High	49/100
19	04558	Pemaquid	ME	54%	High	40/100
20	04649	Jonesport	ME	54%	High	59/100
21	04101	Portland	ME	53%	High	62/100
22	04442	Greenville Junction	ME	53%	High	40/100
23	04462	Millinocket	ME	53%	High	70/100
24	04625	Cranberry Isles	ME	53%	High	53/100
25	04646	Islesford	ME	53%	High	53/100
26	04851	Matinicus	ME	53%	High	53/100
27	04005	Biddeford	ME	52%	High	55/100
28	04006	Biddeford Pool	ME	52%	High	45/100
29	04017	Chebeague Island	ME	52%	High	53/100
30	04239	Jay	ME	52%	High	61/100
31	04252	Lisbon Falls	ME	52%	High	53/100
32	04289	West Paris	ME	52%	High	68/100
33	04570	Squirrel Island	ME	52%	High	53/100
34	04750	Limestone	ME	52%	High	59/100
35	04785	Van Buren	ME	52%	High	70/100
36	04841	Rockland	ME	52%	High	63/100
37	04852	Monhegan	ME	52%	High	63/100
38	04861	Thomaston	ME	52%	High	82/100
39	04019	Cliff Island	ME	51%	High	40/100
40	04063	Ocean Park	ME	51%	High	40/100
41	04071	Raymond	ME	51%	High	43/100
42	04083	Springvale	ME	51%	High	53/100
43	04226	East Andover	ME	51%	High	40/100
44	04254	Livermore Falls	ME	51%	High	50/100
45	04426	Dover Foxcroft	ME	51%	High	45/100
46	04468	Old Town	ME	51%	High	60/100
47	04607	Gouldsboro	ME	51%	High	53/100
48	04655	Machiasport	ME	51%	High	76/100
49	04740	Easton	ME	51%	High	63/100
50	04746	Grand Isle	ME	51%	High	69/100
51	04772	Saint Agatha	ME	51%	High	53/100
52	04853	North Haven	ME	51%	High	83/100
53	04863	Vinalhaven	ME	51%	High	58/100
54	04937	Fairfield	ME	51%	High	58/100
55	04985	West Forks	ME	51%	High	40/100
56	04986	Thorndike	ME	51%	High	53/100
57	04988	Unity	ME	51%	High	58/100
58	04056	Newfield	ME	50%	High	40/100
59	04096	Yarmouth	ME	50%	High	52/100
60	04103	Portland	ME	50%	High	62/100
61	04221	Canton	ME	50%	High	59/100
62	04267	North Waterford	ME	50%	High	40/100
63	04294	Wilton	ME	50%	High	69/100
64	04479	Sangerville	ME	50%	High	65/100
65	04491	Vanceboro	ME	50%	High	53/100
66	04662	Northeast Harbor	ME	50%	High	61/100
67	04681	Stonington	ME	50%	High	62/100
68	04760	Monticello	ME	50%	High	66/100
69	04769	Presque Isle	ME	50%	High	60/100
70	04843	Camden	ME	50%	High	69/100
71	04073	Sanford	ME	49%	High	64/100
72	04240	Lewiston	ME	49%	High	65/100
73	04255	Greenwood	ME	49%	High	65/100
74	04344	Farmingdale	ME	49%	High	69/100
75	04347	Hallowell	ME	49%	High	60/100
76	04492	Waite	ME	49%	High	53/100
77	04619	Calais	ME	49%	High	82/100
78	04631	Eastport	ME	49%	High	83/100
79	04640	Hancock	ME	49%	High	45/100
80	04645	Isle Au Haut	ME	49%	High	40/100
81	04694	Baileyville	ME	49%	High	83/100
82	04730	Houlton	ME	49%	High	69/100
83	04734	Blaine	ME	49%	High	53/100
84	04945	Jackman	ME	49%	High	65/100
85	04967	Pittsfield	ME	49%	High	57/100
86	04984	Temple	ME	49%	High	53/100
87	04066	Orrs Island	ME	48%	High	69/100
88	04106	South Portland	ME	48%	High	45/100
89	04285	Weld	ME	48%	High	53/100
90	04292	Sumner	ME	48%	High	40/100
91	04345	Gardiner	ME	48%	High	56/100
92	04401	Bangor	ME	48%	High	52/100
93	04416	Bucksport	ME	48%	High	62/100
94	04430	East Millinocket	ME	48%	High	70/100
95	04530	Bath	ME	48%	High	76/100
96	04575	West Boothbay Harbor	ME	48%	High	40/100
97	04626	Cutler	ME	48%	High	63/100
98	04652	Lubec	ME	48%	High	77/100
99	04664	Sullivan	ME	48%	High	33/100
100	04756	Madawaska	ME	48%	High	62/100

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.