Large water systems with the highest lead levels

Name: Large water systems with the highest lead levels
Creator: Tap Water Results
License: https://www.usa.gov/government-works

Water systems serving 10,000+ people, ranked by their most recent lead 90th percentile (periods ending 2022 or later). The action level is 15 ppb, falling to 10 ppb in November 2027.

#	Water system	State	People	Lead, 90th pct.
1	Dayton Public Water System	OH	141,407	470 ppb
2	Troy City Public Water System	NY	51,401	110 ppb
3	Indiana American Water – Wabash	IN	12,140	38 ppb
4	Municipal Water Auth of Aliquippa	PA	15,685	33.5 ppb
5	Aurora Water System	IL	183,000	25.7 ppb
6	Lemont Water System	IL	18,513	25 ppb
7	Quincy Water Dept. (MWRA)	MA	106,000	21 ppb
8	City of Riverbank	CA	25,625	21 ppb
9	Lake Forest Water System	IL	19,642	21 ppb
10	Vera Water & Power	WA	24,692	20.8 ppb
11	Bartlett Water System	IL	41,500	20 ppb
12	USMC – 29 Palms	CA	16,067	20 ppb
13	Faribault Water System	MN	23,718	19 ppb
14	Elgin Water System	IL	114,797	18.5 ppb
15	Morton Grove Water System	IL	25,297	17.4 ppb
16	R.C. Willis Water Treatment Plant (City of Palatka)	FL	11,900	16.8 ppb
17	North Salt Lake City Water System	UT	18,655	16 ppb
18	East Moline Water System	IL	21,374	16 ppb
19	Garden City Water System	MI	27,625	15.6 ppb
20	Cheyenne Board of Public Utilities	WY	64,165	15 ppb
21	Watertown Waterworks	WI	23,945	15 ppb
22	Burlington Waterworks	WI	11,043	15 ppb
23	North Mankato Water System	MN	14,448	14 ppb
24	Hibbing Water System	MN	16,028	14 ppb
25	Worthington Water System	MN	14,052	14 ppb
26	City of Tomball	TX	17,532	13.9 ppb
27	City of Amsterdam	NY	20,700	13.9 ppb
28	Ponderosa Forest Utility District	TX	10,101	13.7 ppb
29	Woods Cross City Water System	UT	13,110	13.5 ppb
30	City of Minot	ND	48,743	13.5 ppb
31	Salisbury-Rowan Water System	NC	46,156	13 ppb
32	Two Rivers Waterworks	WI	11,270	13 ppb
33	Fort Atkinson Waterworks	WI	12,390	13 ppb
34	Cudahy Waterworks	WI	18,659	13 ppb
35	Washington Water Works	IN	13,690	13 ppb
36	Albany City Water System	NY	98,000	13 ppb
37	Barrington Water System	IL	10,327	13 ppb
38	DeKalb Water System	IL	40,290	13 ppb
39	Elkhorn Waterworks	WI	10,317	13 ppb
40	Point Pleasant Beach Water Department	NJ	12,000	12.8 ppb
41	Homewood Water System	IL	19,463	12.4 ppb
42	Carrollton Water System	GA	25,200	12.3 ppb
43	Metropolitan Utilities District	NE	660,000	12.3 ppb
44	Paseo del Este Municipal Utility District 1	TX	36,773	12.3 ppb
45	Veolia Water New York, Inc. Rd-1	NY	146,732	12.2 ppb
46	City of Modesto	CA	218,915	12 ppb
47	Town of Winnsboro	SC	10,391	12 ppb
48	City of Syracuse	NY	192,000	12 ppb
49	City of Great Falls	MT	60,000	12 ppb
50	Claiborne Utilities District	TN	16,135	12 ppb
51	Plano Water System	IL	12,600	12 ppb
52	Fall River Water Department	MA	94,000	12 ppb
53	Hamtramck Water System	MI	28,433	11.9 ppb
54	Beaver Dam Water Utility	WI	16,200	11.3 ppb
55	Zion Water System	IL	24,442	11.2 ppb
56	Grayslake Water System	IL	21,248	11 ppb
57	Northbrook Water System	IL	34,200	11 ppb
58	City of Olathe	KS	143,014	11 ppb
59	City of Exeter	CA	11,169	11 ppb
60	Calumet City Water System	IL	37,000	11 ppb
61	Vienna Water System	WV	12,507	11 ppb
62	Illinois American Water – Peoria	IL	137,575	11 ppb
63	Highland Park Water System	IL	30,176	11 ppb
64	Hammond Water District	SC	21,193	11 ppb
65	City of Ingleside	TX	10,106	10.9 ppb
66	Penn State Univ Water System	PA	37,000	10.8 ppb
67	Grosse Pointe Woods Water System	MI	16,135	10.8 ppb
68	Taylor Water System	MI	63,409	10.7 ppb
69	Lombard Water System	IL	44,476	10.6 ppb
70	City of Hattiesburg	MS	43,449	10.4 ppb
71	Brookfield Water System	IL	18,776	10.4 ppb
72	US Department of the Army Fort Carson	CO	48,000	10.4 ppb
73	Platteville Waterworks	WI	12,268	10.3 ppb
74	Village of Garden City	NY	23,272	10.2 ppb
75	Melrose Water Division (MWRA)	MA	29,938	10.2 ppb
76	East Grand Rapids Water System	MI	11,637	10.1 ppb
77	Columbiana Water Works Board	AL	12,903	10 ppb
78	Rockford Water System	IL	147,051	10 ppb
79	Waukegan Water System	IL	87,149	10 ppb
80	Pima Utilities	AZ	20,000	10 ppb
81	Neenah Waterworks	WI	27,506	10 ppb
82	Ipswich DPU Water Dept	MA	13,138	10 ppb
83	Glenview Water System	IL	47,856	10 ppb
84	Whitewater Waterworks	WI	14,000	10 ppb
85	Saint Paul Regional Water Services	MN	392,529	10 ppb
86	Pamlico County Water	NC	19,665	10 ppb
87	Waconia Water System	MN	13,277	10 ppb
88	Town of Berthoud	CO	14,211	10 ppb
89	New York City System	NY	8.3 million	10 ppb
90	Port Wentworth Water System	GA	11,000	10 ppb
91	Somerset Water Department	MA	18,303	10 ppb
92	Lockport City Water Treatment Plant	NY	21,165	10 ppb
93	Blue Island Water System	IL	21,494	9.95 ppb
94	Niles Water System	IL	29,350	9.93 ppb
95	Campbell County Central System	VA	21,761	9.92 ppb
96	Dyer Water Department	IN	16,800	9.9 ppb
97	Sunrise Southwest Water System	FL	10,750	9.9 ppb
98	Erie County Water Authority Lancaster	NY	29,018	9.85 ppb
99	Erie County Water Authority Orchard Park	NY	24,582	9.85 ppb
100	Erie County Water Authority West Seneca	NY	23,557	9.85 ppb

A PFAS result above the limit is not a violation: systems have until 2029 to comply, and EPA says UCMR 5 results do not indicate compliance. Method.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.