ZIP Codes Linked to Water-System PFAS…

Out of 138 ZIP codes with data in Connecticut, these are the highest-ranked areas for pfas status. See also: National ZIP Codes with PFAS Detections in Water | All Connecticut Rankings

Statistic	Value
ZIP codes ranked	138
Highest value	0.0 ppt
Median value	0.0 ppt
State	Connecticut

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	Safety Score
1	06338	Mashantucket	CT	47/100
2	06334	Bozrah	CT	50/100
3	06351	Jewett City	CT	46/100
4	06360	Norwich	CT	50/100
5	06365	Preston	CT	47/100
6	06380	Taftville	CT	50/100
7	06382	Uncasville	CT	41/100
8	06033	Glastonbury	CT	82/100
9	06040	Manchester	CT	82/100
10	06042	Manchester	CT	82/100
11	06066	Vernon Rockville	CT	64/100
12	06074	South Windsor	CT	80/100
13	06470	Newtown	CT	44/100
14	06482	Sandy Hook	CT	33/100
15	06410	Cheshire	CT	37/100
16	06473	North Haven	CT	43/100
17	06492	Wallingford	CT	41/100
18	06413	Clinton	CT	50/100
19	06437	Guilford	CT	50/100
20	06443	Madison	CT	50/100
21	06475	Old Saybrook	CT	50/100
22	06498	Westbrook	CT	50/100
23	06840	New Canaan	CT	50/100
24	06850	Norwalk	CT	49/100
25	06851	Norwalk	CT	49/100
26	06855	Norwalk	CT	49/100
27	06880	Westport	CT	50/100
28	06897	Wilton	CT	49/100
29	06468	Monroe	CT	50/100
30	06484	Shelton	CT	50/100
31	06604	Bridgeport	CT	50/100
32	06605	Bridgeport	CT	50/100
33	06606	Bridgeport	CT	50/100
34	06607	Bridgeport	CT	50/100
35	06608	Bridgeport	CT	50/100
36	06610	Bridgeport	CT	50/100
37	06611	Trumbull	CT	48/100
38	06612	Easton	CT	50/100
39	06614	Stratford	CT	50/100
40	06615	Stratford	CT	50/100
41	06824	Fairfield	CT	50/100
42	06825	Fairfield	CT	50/100
43	06883	Weston	CT	49/100
44	06890	Southport	CT	50/100
45	06401	Ansonia	CT	50/100
46	06405	Branford	CT	50/100
47	06418	Derby	CT	50/100
48	06460	Milford	CT	50/100
49	06461	Milford	CT	50/100
50	06467	Milldale	CT	79/100
51	06471	North Branford	CT	50/100
52	06472	Northford	CT	50/100
53	06477	Orange	CT	50/100
54	06483	Seymour	CT	50/100
55	06510	New Haven	CT	50/100
56	06511	New Haven	CT	50/100
57	06512	East Haven	CT	50/100
58	06513	New Haven	CT	50/100
59	06514	Hamden	CT	50/100
60	06515	New Haven	CT	50/100
61	06516	West Haven	CT	50/100
62	06517	Hamden	CT	50/100
63	06518	Hamden	CT	50/100
64	06519	New Haven	CT	50/100
65	06525	Woodbridge	CT	50/100
66	06716	Wolcott	CT	46/100
67	06877	Ridgefield	CT	42/100
68	06379	Pawcatuck	CT	50/100
69	06234	Brooklyn	CT	67/100
70	06239	Danielson	CT	67/100
71	06241	Dayville	CT	67/100
72	06263	Rogers	CT	67/100
73	06037	Berlin	CT	67/100
74	06450	Meriden	CT	41/100
75	06451	Meriden	CT	49/100
76	06455	Middlefield	CT	45/100
77	06457	Middletown	CT	46/100
78	06489	Southington	CT	77/100
79	06333	East Lyme	CT	36/100
80	06357	Niantic	CT	36/100
81	06415	Colchester	CT	41/100
82	06416	Cromwell	CT	37/100
83	06016	Broad Brook	CT	83/100
84	06071	Somers	CT	65/100
85	06082	Enfield	CT	81/100
86	06260	Putnam	CT	60/100
87	06277	Thompson	CT	67/100
88	06026	East Granby	CT	67/100
89	06035	Granby	CT	81/100
90	06070	Simsbury	CT	69/100
91	06089	Weatogue	CT	72/100
92	06092	West Simsbury	CT	83/100
93	06403	Beacon Falls	CT	50/100
94	06478	Oxford	CT	50/100
95	06001	Avon	CT	83/100
96	06029	Ellington	CT	66/100
97	06032	Farmington	CT	81/100
98	06078	Suffield	CT	83/100
99	06084	Tolland	CT	63/100

Methodology

PFAS detection data comes from EPA UCMR5 monitoring, state-level testing programs, and Consumer Confidence Reports. ZIP codes are ranked by maximum PFAS concentration detected. The EPA has set MCLs of 4 ppt for PFOA and PFOS individually. PFAS are persistent chemicals that do not break down in the environment.

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: 2026-10-18.

Frequently Asked Questions

What are PFAS?

PFAS (per- and polyfluoroalkyl substances) are synthetic chemicals used in non-stick coatings, firefighting foam, and food packaging since the 1940s. They are called "forever chemicals" because they do not break down naturally. PFAS are linked to cancer, liver damage, thyroid disease, and immune system suppression.

How can I remove PFAS from my water?

Reverse osmosis (RO) and granular activated carbon (GAC) filters are effective at removing most PFAS from drinking water. NSF/ANSI 53 or 58 certified filters are recommended. Boiling water does NOT remove PFAS.

ZIP Codes Linked to Water-System PFAS Detections…

Top 100 Worst ZIP Codes

Methodology

Frequently Asked Questions

What are PFAS?

How can I remove PFAS from my water?

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