Worst ZIP Codes for Lead in Water

Out of 18,817 ZIP codes with data across all 50 states, these are the highest-ranked areas for lead (ppb). Each ZIP links to a full safety report with water quality, lead, radon, and flood data.

Statistic	Value
ZIP codes ranked	18,817
Highest value	984.0 ppb
Median value	2.7 ppb

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	Lead (ppb)	Safety Score
1	72601	Harrison	AR	984.0 ppb	—
2	72662	Omaha	AR	984.0 ppb	—
3	17756	Muncy	PA	890.0 ppb	50/100
4	45309	Brookville	OH	470.0 ppb	41/100
5	45315	Clayton	OH	470.0 ppb	49/100
6	45322	Englewood	OH	470.0 ppb	44/100
7	45324	Fairborn	OH	470.0 ppb	62/100
8	45402	Dayton	OH	470.0 ppb	50/100
9	45403	Dayton	OH	470.0 ppb	50/100
10	45404	Dayton	OH	470.0 ppb	50/100
11	45405	Dayton	OH	470.0 ppb	50/100
12	45406	Dayton	OH	470.0 ppb	50/100
13	45409	Dayton	OH	470.0 ppb	50/100
14	45410	Dayton	OH	470.0 ppb	50/100
15	45414	Dayton	OH	470.0 ppb	50/100
16	45415	Dayton	OH	470.0 ppb	50/100
17	45416	Dayton	OH	470.0 ppb	50/100
18	45417	Dayton	OH	470.0 ppb	46/100
19	45419	Dayton	OH	470.0 ppb	50/100
20	45420	Dayton	OH	470.0 ppb	50/100
21	45424	Dayton	OH	470.0 ppb	49/100
22	45426	Dayton	OH	470.0 ppb	45/100
23	45428	Dayton	OH	470.0 ppb	50/100
24	45431	Dayton	OH	470.0 ppb	49/100
25	45432	Dayton	OH	470.0 ppb	49/100
26	45439	Dayton	OH	470.0 ppb	50/100
27	45469	Dayton	OH	470.0 ppb	—
28	72721	Combs	AR	370.0 ppb	—
29	72921	Alma	AR	370.0 ppb	—
30	72946	Mountainburg	AR	370.0 ppb	—
31	72947	Mulberry	AR	370.0 ppb	—
32	72949	Ozark	AR	370.0 ppb	—
33	72959	Winslow	AR	370.0 ppb	97/100
34	17020	Duncannon	PA	301.0 ppb	—
35	03809	Alton	NH	210.0 ppb	—
36	03810	Alton Bay	NH	210.0 ppb	—
37	17042	Lebanon	PA	199.5 ppb	37/100
38	17545	Manheim	PA	199.5 ppb	35/100
39	18302	East Stroudsburg	PA	184.0 ppb	—
40	92354	Loma Linda	CA	170.0 ppb	58/100
41	92408	San Bernardino	CA	170.0 ppb	58/100
42	18355	Scotrun	PA	122.8 ppb	58/100
43	18360	Stroudsburg	PA	122.8 ppb	50/100
44	03048	Greenville	NH	110.0 ppb	—
45	98260	Langley	WA	104.6 ppb	—
46	65672	Hollister	MO	103.5 ppb	78/100
47	65739	Ridgedale	MO	103.5 ppb	—
48	94130	San Francisco	CA	100.0 ppb	—
49	94501	Alameda	CA	100.0 ppb	—
50	17509	Christiana	PA	98.0 ppb	—
51	17566	Quarryville	PA	98.0 ppb	—
52	17268	Waynesboro	PA	94.5 ppb	50/100
53	18071	Palmerton	PA	83.3 ppb	—
54	60035	Highland Park	IL	76.0 ppb	76/100
55	60040	Highwood	IL	76.0 ppb	81/100
56	18301	East Stroudsburg	PA	71.5 ppb	50/100
57	49111	Eau Claire	MI	71.0 ppb	—
58	48430	Fenton	MI	69.0 ppb	67/100
59	48439	Grand Blanc	MI	69.0 ppb	81/100
60	15501	Somerset	PA	65.8 ppb	67/100
61	17013	Carlisle	PA	60.8 ppb	33/100
62	46741	Grabill	IN	58.6 ppb	—
63	46743	Harlan	IN	58.6 ppb	—
64	46765	Leo	IN	58.6 ppb	—
65	46788	Spencerville	IN	58.6 ppb	—
66	12569	Pleasant Valley	NY	49.0 ppb	—
67	61752	Le Roy	IL	49.0 ppb	58/100
68	98277	Oak Harbor	WA	48.9 ppb	—
69	84335	Smithfield	UT	46.0 ppb	67/100
70	87301	Gallup	NM	46.0 ppb	—
71	87375	Yatahey	NM	46.0 ppb	—
72	92029	Escondido	CA	44.0 ppb	90/100
73	77070	Houston	TX	43.8 ppb	84/100
74	77429	Cypress	TX	43.8 ppb	75/100
75	15801	Du Bois	PA	43.7 ppb	—
76	15848	Luthersburg	PA	43.7 ppb	—
77	15849	Penfield	PA	43.7 ppb	—
78	15856	Rockton	PA	43.7 ppb	—
79	16828	Centre Hall	PA	43.3 ppb	50/100
80	16875	Spring Mills	PA	43.3 ppb	—
81	03869	Rollinsford	NH	43.0 ppb	—
82	14052	East Aurora	NY	42.0 ppb	66/100
83	14139	South Wales	NY	42.0 ppb	67/100
84	59072	Roundup	MT	41.0 ppb	—
85	71961	Oden	AR	40.0 ppb	—
86	36726	Camden	AL	38.0 ppb	—
87	36768	Pine Apple	AL	38.0 ppb	—
88	03223	Campton	NH	37.0 ppb	—
89	28338	Ellerbe	NC	37.0 ppb	73/100
90	53533	Dodgeville	WI	37.0 ppb	—
91	53565	Mineral Point	WI	37.0 ppb	—
92	89048	Pahrump	NV	37.0 ppb	72/100
93	49319	Cedar Springs	MI	36.1 ppb	71/100
94	49330	Kent City	MI	36.1 ppb	—
95	03246	Laconia	NH	36.0 ppb	82/100
96	13357	Ilion	NY	36.0 ppb	—
97	13407	Mohawk	NY	36.0 ppb	—
98	72112	Newport	AR	36.0 ppb	—
99	72431	Grubbs	AR	36.0 ppb	—
100	72473	Tuckerman	AR	36.0 ppb	95/100

Rankings by State

State	ZIP Codes Ranked
Texas	1,337
New York	1,233
Florida	921
Pennsylvania	903
California	817
Missouri	763
Illinois	691
Ohio	681
Tennessee	590
Michigan	577
Georgia	545
New Jersey	483
Indiana	481
Oklahoma	460
Wisconsin	447
Arkansas	433
Kansas	416
Kentucky	416
Massachusetts	411
Alabama	410
West Virginia	370
Virginia	369
Mississippi	366
Minnesota	365
Washington	363
Louisiana	362
Iowa	344
South Carolina	289
Colorado	286
South Dakota	286
North Carolina	247
Oregon	216
Arizona	213
Utah	193
Maryland	189
Maine	165
North Dakota	143
Nebraska	142
Vermont	138
New Mexico	132
Connecticut	111
Idaho	93
Nevada	90
Montana	62
Rhode Island	61
Delaware	53
New Hampshire	46
Wyoming	44
District of Columbia	36
Alaska	15
Hawaii	13

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.

Worst ZIP Codes for Lead in Water — 2026 Rankings