Interactive Map

Lead Exposure Map — U.S. County-Level Lead Risk Scores

Explore lead exposure risk across all 50 states, aggregated from ZIP-level data. Risk scores combine EPA 90th-percentile lead sampling data, pre-1986 housing stock percentage, and service line replacement probability.

32,958 ZIP Codes Analyzed

2 High-Risk States

NY Highest Risk (61)

NV Lowest Risk (33)

Loading lead exposure risk map…

Low Moderate High Very High

Data: EPA Lead and Copper Rule sampling, U.S. Census housing vintage, CDC blood lead surveillance. Map updated 2026-05-14.

State Lead Exposure Risk Rankings

All states ranked by average lead exposure risk score. Higher scores indicate greater risk.

#	State	Risk Score	Risk Level	Avg Lead (ppb)	Pre-1986 Housing	ZIPs
1	NY	61	High	8 ppb	76%	2,429
2	IA	60	High	4 ppb	76%	801
3	IL	58	Moderate	7 ppb	70%	1,410
4	MA	58	Moderate	4 ppb	74%	660
5	PA	57	Moderate	15 ppb	70%	1,447
6	OH	57	Moderate	22 ppb	71%	1,021
7	ND	57	Moderate	4 ppb	74%	288
8	RI	57	Moderate	6 ppb	74%	395
9	KS	56	Moderate	3 ppb	73%	742
10	NE	56	Moderate	4 ppb	72%	661
11	NJ	56	Moderate	4 ppb	72%	244
12	MI	55	Moderate	4 ppb	69%	795
13	IN	54	Moderate	4 ppb	66%	821
14	WI	54	Moderate	4 ppb	65%	852
15	MN	54	Moderate	4 ppb	68%	1,026
16	NH	54	Moderate	28 ppb	64%	251
17	VT	53	Moderate	3 ppb	67%	257
18	SD	52	Moderate	3 ppb	66%	284
19	CT	52	Moderate	4 ppb	69%	318
20	DC	51	Moderate	1 ppb	66%	402
21	MO	51	Moderate	3 ppb	64%	904
22	CA	51	Moderate	7 ppb	66%	1,697
23	ME	51	Moderate	4 ppb	63%	412
24	KY	50	Moderate	3 ppb	63%	534
25	MT	50	Moderate	3 ppb	63%	254
26	OK	49	Moderate	7 ppb	63%	653
27	WY	47	Moderate	3 ppb	59%	178
28	OR	47	Moderate	3 ppb	60%	398
29	VA	46	Moderate	4 ppb	59%	783
30	NM	46	Moderate	4 ppb	59%	288
31	HI	46	Moderate	7 ppb	59%	160
32	MD	45	Moderate	2 ppb	59%	315
33	WV	45	Moderate	2 ppb	58%	651
34	MS	45	Moderate	2 ppb	60%	539
35	ID	45	Moderate	4 ppb	56%	250
36	CO	44	Moderate	4 ppb	54%	513
37	WA	44	Moderate	3 ppb	57%	548
38	NC	43	Moderate	8 ppb	49%	684
39	AL	43	Moderate	3 ppb	55%	580
40	TN	43	Moderate	2 ppb	58%	850
41	TX	43	Moderate	4 ppb	53%	2,144
42	LA	43	Moderate	2 ppb	58%	421
43	AR	43	Moderate	7 ppb	55%	476
44	AK	42	Moderate	4 ppb	55%	278
45	UT	41	Moderate	3 ppb	52%	290
46	DE	39	Low	3 ppb	50%	55
47	SC	38	Low	3 ppb	49%	374
48	GA	38	Low	3 ppb	49%	632
49	AZ	37	Low	3 ppb	46%	444
50	FL	36	Low	2 ppb	47%	1,362
51	NV	33	Low	2 ppb	40%	187

Understanding Lead Exposure Risk Scores

The lead exposure risk score (0–100) combines three data sources to assess the likelihood of residential lead exposure in each ZIP code:

EPA 90th Percentile Lead Levels — from Lead and Copper Rule (LCR) sampling at residential taps. The EPA action level is 15 ppb.
Housing Vintage — percentage of homes built before 1986 (when lead solder was banned) and before 1950 (high lead paint risk).
Service Line Probability — estimated likelihood of lead service lines connecting homes to water mains, based on housing age and utility reports.

What You Can Do

If you live in a high-risk area, consider testing your tap water with a certified lab ($15–40 for a DIY kit). Run your tap for 30 seconds before drinking to flush standing water from pipes. For homes built before 1978, get a lead paint inspection before any renovation work.

Data Sources

EPA Safe Drinking Water Information System (SDWIS) Lead and Copper Rule data, U.S. Census American Community Survey housing vintage estimates, CDC Childhood Blood Lead Surveillance System. Data updated quarterly.

Concerned about your home safety?

Use our free tools to check your home's safety profile.

Check Your Home's Safety Score

Free tool — no signup required