ZIP Codes with Most EPA Violations in Massachusetts ...

Out of 244 ZIP codes with data in Massachusetts, these are the highest-ranked areas for recorded epa violations. See also: National ZIP Codes with Most EPA Water Violations | All Massachusetts Rankings

Statistic	Value
ZIP codes ranked	244
Highest value	140
Median value	2
State	Massachusetts

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	Recorded EPA Violations	Safety Score
1	02056	Norfolk	MA	140	50/100
2	01740	Bolton	MA	121	—
3	01503	Berlin	MA	120	—
4	01749	Hudson	MA	120	50/100
5	02025	Cohasset	MA	62	66/100
6	02338	Halifax	MA	60	66/100
7	01581	Westborough	MA	56	38/100
8	01568	Upton	MA	35	65/100
9	02747	North Dartmouth	MA	34	66/100
10	02790	Westport	MA	34	—
11	01560	South Grafton	MA	32	37/100
12	01746	Holliston	MA	32	37/100
13	01463	Pepperell	MA	30	40/100
14	01519	Grafton	MA	30	38/100
15	02043	Hingham	MA	30	67/100
16	02045	Hull	MA	30	67/100
17	02346	Middleboro	MA	30	67/100
18	02347	Lakeville	MA	30	67/100
19	02717	East Freetown	MA	30	83/100
20	02718	East Taunton	MA	30	83/100
21	02720	Fall River	MA	30	83/100
22	02721	Fall River	MA	30	83/100
23	02723	Fall River	MA	30	83/100
24	02724	Fall River	MA	30	83/100
25	02767	Raynham	MA	30	67/100
26	02780	Taunton	MA	30	83/100
27	01545	Shrewsbury	MA	28	41/100
28	01536	North Grafton	MA	27	41/100
29	01050	Huntington	MA	22	—
30	01005	Barre	MA	17	61/100
31	01074	South Barre	MA	17	61/100
32	02050	Marshfield	MA	16	57/100
33	02568	Vineyard Haven	MA	15	82/100
34	02047	Humarock	MA	14	57/100
35	02066	Scituate	MA	14	57/100
36	01890	Winchester	MA	12	—
37	02038	Franklin	MA	12	61/100
38	01876	Tewksbury	MA	10	44/100
39	02093	Wrentham	MA	9	63/100
40	01469	Townsend	MA	8	48/100
41	01474	West Townsend	MA	8	48/100
42	02330	Carver	MA	8	58/100
43	02554	Nantucket	MA	8	—
44	02564	Siasconset	MA	8	—
45	02324	Bridgewater	MA	7	60/100
46	01434	Devens	MA	6	65/100
47	01862	North Billerica	MA	6	47/100
48	01432	Ayer	MA	5	65/100
49	01501	Auburn	MA	5	48/100
50	01776	Sudbury	MA	5	44/100
51	02325	Bridgewater	MA	5	—
52	01230	Great Barrington	MA	4	—
53	01236	Housatonic	MA	4	—
54	01543	Rutland	MA	4	64/100
55	01940	Lynnfield	MA	4	45/100
56	01949	Middleton	MA	4	45/100
57	02148	Malden	MA	4	59/100
58	02360	Plymouth	MA	4	83/100
59	02364	Kingston	MA	4	82/100
60	02420	Lexington	MA	4	64/100
61	02740	New Bedford	MA	4	83/100
62	02744	New Bedford	MA	4	83/100
63	02748	South Dartmouth	MA	4	66/100
64	01603	Worcester	MA	3	65/100
65	01731	Hanscom Afb	MA	3	63/100
66	01775	Stow	MA	3	49/100
67	01821	Billerica	MA	3	49/100
68	01824	Chelmsford	MA	3	46/100
69	01826	Dracut	MA	3	47/100
70	02019	Bellingham	MA	3	65/100
71	02341	Hanson	MA	3	66/100
72	02760	North Attleboro	MA	3	65/100
73	02763	Attleboro Falls	MA	3	—
74	01008	Blandford	MA	2	—
75	01034	Granville	MA	2	81/100
76	01039	Haydenville	MA	2	—
77	01069	Palmer	MA	2	83/100
78	01079	Thorndike	MA	2	—
79	01085	Westfield	MA	2	83/100
80	01093	Whately	MA	2	82/100
81	01106	Longmeadow	MA	2	82/100
82	01373	South Deerfield	MA	2	82/100
83	01375	Sunderland	MA	2	—
84	01440	Gardner	MA	2	66/100
85	01451	Harvard	MA	2	—
86	01515	East Brookfield	MA	2	66/100
87	01564	Sterling	MA	2	48/100
88	01570	Webster	MA	2	49/100
89	01571	Dudley	MA	2	66/100
90	01583	West Boylston	MA	2	49/100
91	01588	Whitinsville	MA	2	66/100
92	01590	Sutton	MA	2	66/100
93	01606	Worcester	MA	2	66/100
94	01607	Worcester	MA	2	49/100
95	01720	Acton	MA	2	50/100
96	01742	Concord	MA	2	50/100
97	01754	Maynard	MA	2	49/100
98	01773	Lincoln	MA	2	49/100
99	01803	Burlington	MA	2	67/100
100	01810	Andover	MA	2	64/100

Methodology

Violation counts include all types recorded in the EPA SDWIS database: Maximum Contaminant Level (MCL) violations, treatment technique violations, and monitoring/reporting violations. Both resolved and unresolved violations are counted. Higher counts may reflect longer system histories or larger service areas.

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: 2026-08-31.

Frequently Asked Questions

What counts as an EPA water violation?

EPA violations include exceeding Maximum Contaminant Levels (MCLs), failing to treat water properly (treatment technique violations), and not testing or reporting on schedule (monitoring violations). Health-based violations are the most serious.

Does a high violation count mean the water is unsafe now?

Not necessarily. Many violations are historical or monitoring-related. However, a pattern of repeated violations indicates systemic issues with water system management or infrastructure.