Códigos ZIP con mayor contenido de plomo en el agua en Connecticut

Out of 111 ZIP codes with data in Connecticut, these are the highest-ranked areas for lead (ppb). See also: National Worst ZIP Codes for Lead in Water | All Connecticut Rankings

Statistic	Value
ZIP codes ranked	111
Highest value	9.2 ppb
Median value	2.0 ppb
State	Connecticut

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	Lead (ppb)	Safety Score
1	06238	Coventry	CT	9.2 ppb	77/100
2	06370	Oakdale	CT	7.6 ppb	—
3	06268	Storrs Mansfield	CT	6.3 ppb	50/100
4	06804	Brookfield	CT	6.1 ppb	33/100
5	06810	Danbury	CT	5.6 ppb	33/100
6	06365	Preston	CT	5.3 ppb	47/100
7	06071	Somers	CT	4.8 ppb	65/100
8	06470	Newtown	CT	4.0 ppb	44/100
9	06482	Sandy Hook	CT	4.0 ppb	33/100
10	06777	New Preston Marble Dale	CT	3.7 ppb	—
11	06793	Washington	CT	3.7 ppb	—
12	06794	Washington Depot	CT	3.7 ppb	67/100
13	06877	Ridgefield	CT	3.4 ppb	42/100
14	06335	Gales Ferry	CT	3.3 ppb	—
15	06339	Ledyard	CT	3.3 ppb	—
16	06776	New Milford	CT	3.0 ppb	50/100
17	06812	New Fairfield	CT	3.0 ppb	—
18	06382	Uncasville	CT	2.9 ppb	41/100
19	06023	East Berlin	CT	2.8 ppb	—
20	06037	Berlin	CT	2.8 ppb	67/100
21	06786	Terryville	CT	2.8 ppb	83/100
22	06787	Thomaston	CT	2.8 ppb	83/100
23	06611	Trumbull	CT	2.8 ppb	48/100
24	06001	Avon	CT	2.4 ppb	83/100
25	06010	Bristol	CT	2.4 ppb	82/100
26	06019	Canton	CT	2.4 ppb	83/100
27	06032	Farmington	CT	2.4 ppb	81/100
28	06053	New Britain	CT	2.4 ppb	82/100
29	06062	Plainville	CT	2.4 ppb	78/100
30	06070	Simsbury	CT	2.4 ppb	69/100
31	06085	Unionville	CT	2.4 ppb	83/100
32	06089	Weatogue	CT	2.4 ppb	72/100
33	06092	West Simsbury	CT	2.4 ppb	83/100
34	06340	Groton	CT	2.4 ppb	55/100
35	06002	Bloomfield	CT	2.3 ppb	83/100
36	06239	Danielson	CT	2.3 ppb	67/100
37	06354	Moosup	CT	2.3 ppb	—
38	06374	Plainfield	CT	2.3 ppb	—
39	06052	New Britain	CT	2.2 ppb	97/100
40	06360	Norwich	CT	2.2 ppb	50/100
41	06380	Taftville	CT	2.2 ppb	50/100
42	06779	Oakville	CT	2.2 ppb	78/100
43	06795	Watertown	CT	2.2 ppb	76/100
44	06031	Falls Village	CT	2.0 ppb	—
45	06351	Jewett City	CT	2.0 ppb	46/100
46	06371	Old Lyme	CT	2.0 ppb	—
47	06424	East Hampton	CT	2.0 ppb	—
48	06704	Waterbury	CT	2.0 ppb	63/100
49	06708	Waterbury	CT	2.0 ppb	63/100
50	06716	Wolcott	CT	2.0 ppb	46/100
51	06755	Gaylordsville	CT	2.0 ppb	67/100
52	06757	Kent	CT	2.0 ppb	—
53	06785	South Kent	CT	2.0 ppb	—
54	06820	Darien	CT	2.0 ppb	50/100
55	06850	Norwalk	CT	2.0 ppb	49/100
56	06854	Norwalk	CT	2.0 ppb	66/100
57	06016	Broad Brook	CT	1.9 ppb	83/100
58	06026	East Granby	CT	1.9 ppb	67/100
59	06029	Ellington	CT	1.9 ppb	66/100
60	06042	Manchester	CT	1.9 ppb	82/100
61	06066	Vernon Rockville	CT	1.9 ppb	64/100
62	06074	South Windsor	CT	1.9 ppb	80/100
63	06076	Stafford Springs	CT	1.9 ppb	—
64	06078	Suffield	CT	1.9 ppb	83/100
65	06080	Suffield	CT	1.9 ppb	—
66	06082	Enfield	CT	1.9 ppb	81/100
67	06084	Tolland	CT	1.9 ppb	63/100
68	06088	East Windsor	CT	1.9 ppb	83/100
69	06093	West Suffield	CT	1.9 ppb	83/100
70	06096	Windsor Locks	CT	1.9 ppb	83/100
71	06355	Mystic	CT	1.9 ppb	64/100
72	06359	North Stonington	CT	1.9 ppb	—
73	06378	Stonington	CT	1.9 ppb	66/100
74	06488	Southbury	CT	1.8 ppb	33/100
75	06250	Mansfield Center	CT	1.7 ppb	73/100
76	06231	Amston	CT	1.5 ppb	—
77	06248	Hebron	CT	1.5 ppb	—
78	06320	New London	CT	1.5 ppb	64/100
79	06375	Quaker Hill	CT	1.5 ppb	—
80	06385	Waterford	CT	1.5 ppb	64/100
81	06420	Salem	CT	1.5 ppb	—
82	06256	North Windham	CT	1.4 ppb	—
83	06712	Prospect	CT	1.4 ppb	64/100
84	06801	Bethel	CT	1.4 ppb	36/100
85	06018	Canaan	CT	1.3 ppb	—
86	06024	East Canaan	CT	1.3 ppb	—
87	06057	New Hartford	CT	1.3 ppb	82/100
88	06040	Manchester	CT	1.2 ppb	82/100
89	06255	North Grosvenordale	CT	1.1 ppb	—
90	06262	Quinebaug	CT	1.1 ppb	—
91	06269	Storrs Mansfield	CT	1.1 ppb	59/100
92	06277	Thompson	CT	1.1 ppb	67/100
93	06403	Beacon Falls	CT	1.1 ppb	50/100
94	06478	Oxford	CT	1.1 ppb	50/100
95	06483	Seymour	CT	1.1 ppb	50/100
96	06811	Danbury	CT	1.1 ppb	33/100
97	06784	Sherman	CT	1.0 ppb	—
98	06798	Woodbury	CT	1.0 ppb	83/100
99	06762	Middlebury	CT	0.7 ppb	48/100
100	06069	Sharon	CT	0.6 ppb	—

Methodology

Lead rankings are based on the 90th percentile lead testing value (PB90) reported by water systems under the Lead and Copper Rule. When CCR data is unavailable, EPA SDWIS lead sampling data is used. The EPA action level for lead is 15 ppb (0.015 mg/L). There is no safe level of lead exposure.

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: 2026-08-11.

Frequently Asked Questions

What is a dangerous lead level in water?

The EPA action level is 15 parts per billion (ppb). The American Academy of Pediatrics recommends no more than 1 ppb for school drinking water. There is no safe level of lead exposure for children.

How is lead measured in water?

Water systems collect samples from homes with known lead service lines or lead solder. The 90th percentile value (PB90) means 90% of samples tested below that level. If PB90 exceeds 15 ppb, the system must take corrective action.

Códigos ZIP con mayor contenido de plomo en el agua en Connecticut — 2026