PFAS Detections in Connecticut ZIP Codes — 2026

Out of 166 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	166
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	64/100
2	06249	Lebanon	CT	62/100
3	06254	North Franklin	CT	45/100
4	06334	Bozrah	CT	63/100
5	06351	Jewett City	CT	60/100
6	06353	Montville	CT	60/100
7	06360	Norwich	CT	49/100
8	06365	Preston	CT	64/100
9	06380	Taftville	CT	63/100
10	06382	Uncasville	CT	68/100
11	06389	Yantic	CT	55/100
12	06033	Glastonbury	CT	81/100
13	06040	Manchester	CT	86/100
14	06042	Manchester	CT	86/100
15	06066	Vernon Rockville	CT	65/100
16	06074	South Windsor	CT	78/100
17	06470	Newtown	CT	57/100
18	06482	Sandy Hook	CT	51/100
19	06410	Cheshire	CT	48/100
20	06473	North Haven	CT	40/100
21	06492	Wallingford	CT	55/100
22	06413	Clinton	CT	53/100
23	06437	Guilford	CT	55/100
24	06443	Madison	CT	55/100
25	06475	Old Saybrook	CT	35/100
26	06498	Westbrook	CT	54/100
27	06840	New Canaan	CT	50/100
28	06850	Norwalk	CT	59/100
29	06851	Norwalk	CT	59/100
30	06855	Norwalk	CT	54/100
31	06880	Westport	CT	40/100
32	06897	Wilton	CT	59/100
33	06468	Monroe	CT	65/100
34	06484	Shelton	CT	55/100
35	06604	Bridgeport	CT	35/100
36	06605	Bridgeport	CT	35/100
37	06606	Bridgeport	CT	35/100
38	06607	Bridgeport	CT	45/100
39	06608	Bridgeport	CT	45/100
40	06610	Bridgeport	CT	45/100
41	06611	Trumbull	CT	57/100
42	06612	Easton	CT	45/100
43	06614	Stratford	CT	40/100
44	06615	Stratford	CT	35/100
45	06824	Fairfield	CT	46/100
46	06825	Fairfield	CT	51/100
47	06883	Weston	CT	60/100
48	06890	Southport	CT	40/100
49	06401	Ansonia	CT	53/100
50	06405	Branford	CT	55/100
51	06408	Cheshire	CT	50/100
52	06411	Cheshire	CT	50/100
53	06418	Derby	CT	45/100
54	06460	Milford	CT	40/100
55	06461	Milford	CT	50/100
56	06467	Milldale	CT	73/100
57	06471	North Branford	CT	55/100
58	06472	Northford	CT	45/100
59	06477	Orange	CT	42/100
60	06483	Seymour	CT	65/100
61	06501	New Haven	CT	70/100
62	06502	New Haven	CT	66/100
63	06503	New Haven	CT	70/100
64	06504	New Haven	CT	66/100
65	06505	New Haven	CT	70/100
66	06506	New Haven	CT	70/100
67	06507	New Haven	CT	70/100
68	06508	New Haven	CT	66/100
69	06509	New Haven	CT	66/100
70	06510	New Haven	CT	70/100
71	06511	New Haven	CT	65/100
72	06512	East Haven	CT	30/100
73	06513	New Haven	CT	60/100
74	06514	Hamden	CT	40/100
75	06515	New Haven	CT	60/100
76	06516	West Haven	CT	51/100
77	06517	Hamden	CT	45/100
78	06518	Hamden	CT	35/100
79	06519	New Haven	CT	65/100
80	06520	New Haven	CT	66/100
81	06521	New Haven	CT	66/100
82	06524	Bethany	CT	53/100
83	06525	Woodbridge	CT	40/100
84	06530	New Haven	CT	66/100
85	06531	New Haven	CT	70/100
86	06532	New Haven	CT	66/100
87	06533	New Haven	CT	66/100
88	06534	New Haven	CT	66/100
89	06535	New Haven	CT	66/100
90	06536	New Haven	CT	66/100
91	06537	New Haven	CT	66/100
92	06538	New Haven	CT	66/100
93	06540	New Haven	CT	70/100
94	06716	Wolcott	CT	61/100
95	06877	Ridgefield	CT	58/100
96	06379	Pawcatuck	CT	45/100
97	06234	Brooklyn	CT	68/100
98	06239	Danielson	CT	82/100
99	06241	Dayville	CT	41/100
100	06263	Rogers	CT	53/100

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: 2026-06-04.

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.