Worst ZIP Codes for Lead in Water

Out of 29,756 ZIP codes with data across all 50 states, these are the highest-ranked areas for lead (mg/l). Each ZIP links to a full safety report with water quality, lead, radon, and flood data.

Statistic	Value
ZIP codes ranked	29,756
Highest value	3750.0 ppb
Median value	2.0 ppb

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	Lead (mg/L)	Safety Score
1	11757	Lindenhurst	NY	3750.0 ppb	49/100
2	33458	Jupiter	FL	990.0 ppb	76/100
3	33468	Jupiter	FL	990.0 ppb	91/100
4	33469	Jupiter	FL	990.0 ppb	76/100
5	33477	Jupiter	FL	990.0 ppb	76/100
6	33478	Jupiter	FL	990.0 ppb	81/100
7	21711	Big Pool	MD	938.0 ppb	53/100
8	21750	Hancock	MD	938.0 ppb	63/100
9	21766	Little Orleans	MD	938.0 ppb	40/100
10	60008	Rolling Meadows	IL	929.0 ppb	76/100
11	65662	Grovespring	MO	920.0 ppb	83/100
12	65667	Hartville	MO	920.0 ppb	83/100
13	65713	Niangua	MO	920.0 ppb	82/100
14	74045	Maramec	OK	900.0 ppb	66/100
15	17756	Muncy	PA	890.0 ppb	16/100
16	63853	Holland	MO	890.0 ppb	98/100
17	60159	Schaumburg	IL	837.0 ppb	73/100
18	60168	Schaumburg	IL	837.0 ppb	73/100
19	60173	Schaumburg	IL	837.0 ppb	73/100
20	60193	Schaumburg	IL	837.0 ppb	68/100
21	60194	Schaumburg	IL	837.0 ppb	73/100
22	60195	Schaumburg	IL	837.0 ppb	73/100
23	60196	Schaumburg	IL	837.0 ppb	73/100
24	73569	Terral	OK	826.0 ppb	93/100
25	74755	Rufe	OK	815.0 ppb	66/100
26	20607	Accokeek	MD	800.0 ppb	78/100
27	32233	Atlantic Beach	FL	800.0 ppb	76/100
28	32778	Tavares	FL	800.0 ppb	80/100
29	43701	Zanesville	OH	800.0 ppb	58/100
30	43702	Zanesville	OH	800.0 ppb	68/100
31	65329	Florence	MO	800.0 ppb	53/100
32	65354	Syracuse	MO	800.0 ppb	82/100
33	78109	Converse	TX	800.0 ppb	90/100
34	34430	Dunnellon	FL	790.0 ppb	79/100
35	34433	Dunnellon	FL	790.0 ppb	74/100
36	34434	Dunnellon	FL	790.0 ppb	74/100
37	34445	Holder	FL	790.0 ppb	53/100
38	34460	Lecanto	FL	790.0 ppb	81/100
39	34461	Lecanto	FL	790.0 ppb	69/100
40	64780	Rockville	MO	790.0 ppb	82/100
41	87544	Los Alamos	NM	770.0 ppb	74/100
42	87545	Los Alamos	NM	770.0 ppb	72/100
43	87547	White Rock	NM	770.0 ppb	63/100
44	75068	Little Elm	TX	761.0 ppb	86/100
45	59086	Wilsall	MT	722.0 ppb	62/100
46	77404	Bay City	TX	700.0 ppb	76/100
47	77414	Bay City	TX	700.0 ppb	61/100
48	77420	Boling	TX	700.0 ppb	81/100
49	77482	Van Vleck	TX	700.0 ppb	76/100
50	18612	Dallas	PA	672.3 ppb	26/100
51	18690	Dallas	PA	672.3 ppb	15/100
52	59631	Basin	MT	660.0 ppb	69/100
53	59728	Elliston	MT	660.0 ppb	40/100
54	62874	Orient	IL	650.0 ppb	50/100
55	64743	East Lynne	MO	650.0 ppb	65/100
56	16316	Conneaut Lake	PA	640.0 ppb	52/100
57	20764	Shady Side	MD	630.0 ppb	45/100
58	21037	Edgewater	MD	630.0 ppb	45/100
59	21056	Gibson Island	MD	630.0 ppb	63/100
60	21062	Glen Burnie	MD	630.0 ppb	53/100
61	21106	Mayo	MD	630.0 ppb	53/100
62	21123	Pasadena	MD	630.0 ppb	53/100
63	21401	Annapolis	MD	630.0 ppb	73/100
64	21403	Annapolis	MD	630.0 ppb	68/100
65	21404	Annapolis	MD	630.0 ppb	83/100
66	21411	Annapolis	MD	630.0 ppb	83/100
67	21412	Annapolis	MD	630.0 ppb	83/100
68	43147	Pickerington	OH	600.0 ppb	65/100
69	87565	San Jose	NM	600.0 ppb	51/100
70	95363	Patterson	CA	600.0 ppb	90/100
71	03285	Thornton	NH	566.0 ppb	53/100
72	74723	Bennington	OK	559.0 ppb	97/100
73	74726	Bokchito	OK	559.0 ppb	88/100
74	74731	Cartwright	OK	559.0 ppb	84/100
75	40402	Annville	KY	528.0 ppb	55/100
76	40447	Mc Kee	KY	528.0 ppb	55/100
77	40729	East Bernstadt	KY	528.0 ppb	63/100
78	41141	Garrison	KY	523.0 ppb	78/100
79	41166	Quincy	KY	523.0 ppb	53/100
80	39560	Long Beach	MS	510.0 ppb	73/100
81	97501	Medford	OR	500.0 ppb	86/100
82	97503	White City	OR	500.0 ppb	74/100
83	97504	Medford	OR	500.0 ppb	86/100
84	95914	Bangor	CA	490.0 ppb	66/100
85	95923	Canyon Dam	CA	490.0 ppb	66/100
86	95965	Oroville	CA	490.0 ppb	86/100
87	95966	Oroville	CA	490.0 ppb	86/100
88	95968	Palermo	CA	490.0 ppb	65/100
89	75452	Leonard	TX	485.0 ppb	60/100
90	45433	Dayton	OH	470.0 ppb	32/100
91	45440	Dayton	OH	470.0 ppb	39/100
92	45449	Dayton	OH	470.0 ppb	39/100
93	45458	Dayton	OH	470.0 ppb	44/100
94	45459	Dayton	OH	470.0 ppb	39/100
95	29148	Summerton	SC	460.0 ppb	84/100
96	59353	Wibaux	MT	444.0 ppb	69/100
97	75126	Forney	TX	426.0 ppb	90/100
98	59275	Westby	MT	385.0 ppb	66/100
99	03221	Bradford	NH	381.0 ppb	53/100
100	27873	Saratoga	NC	372.5 ppb	66/100

Rankings by State

State	ZIP Codes Ranked
Texas	2,087
California	1,899
New York	1,541
Florida	1,384
Illinois	1,199
Missouri	1,063
Ohio	937
Pennsylvania	849
Georgia	816
Iowa	813
Michigan	743
Wisconsin	698
Virginia	689
Arkansas	685
Indiana	669
Minnesota	629
Kansas	618
Oklahoma	617
Alabama	606
Kentucky	605
Massachusetts	604
Tennessee	576
North Carolina	573
Washington	558
Colorado	547
Louisiana	546
Nebraska	544
Mississippi	502
New Jersey	472
Arizona	465
South Carolina	446
New Mexico	392
Maryland	377
West Virginia	374
Oregon	364
Montana	353
Connecticut	335
District of Columbia	286
Utah	280
Maine	253
Idaho	247
South Dakota	244
North Dakota	235
Nevada	222
Alaska	216
Vermont	183
Wyoming	136
New Hampshire	103
Delaware	86
Rhode Island	65
Hawaii	25

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: 2026-06-09.

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.

Worst ZIP Codes for Lead in Water — 2026 Rankings