Large water systems with the highest PFOA or PFOS

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

Water systems serving 10,000 or more people, ranked by how far their highest entry-point average of PFOA or PFOS is above the 4 ppt federal limit (EPA UCMR 5, 2023–2025).

#	Water system	State	People	Times the limit
1	Emmaus Borough Public Water	PA	14,000	31.8×
2	Lubeck Public Service District	WV	11,724	22.4×
3	Guam Waterworks Authority – Northern Water System	GU	139,207	16.9×
4	City of Tempe	AZ	165,000	13.8×
5	Liberty Utilities – Bellflower-Norwalk	CA	72,472	13.8×
6	City of Oxford	MS	28,500	13.2×
7	Raynham Center Water District	MA	10,964	12.2×
8	Montebello Land & Water Company	CA	26,554	11.6×
9	Florida Keys Aqueduct Authority J. Robert Dean W.T.P.	FL	86,000	11.5×
10	City of North Miami	FL	89,349	11.1×
11	Augusta-Richmond County Water System	GA	204,000	10.9×
12	Verona Water Department	NJ	13,641	10.8×
13	Liberty Water Rio Rico	AZ	17,960	10.1×
14	Town of Payson	AZ	17,682	9.93×
15	City of Ocala	FL	66,449	9.75×
16	City of Sacramento Main	CA	527,979	9.71×
17	City of Downey Water Dept.	CA	110,556	9.5×
18	Village of Palm Springs	FL	32,467	9.5×
19	Irondale Water System	AL	10,098	9.38×
20	Livingston Township Division of Water	NJ	27,391	9.24×
21	Tarpon Springs Water System	FL	28,875	9.15×
22	City of Clovis	CA	133,118	9×
23	Duxbury Water Department	MA	16,387	8.68×
24	MDWASA/Rex Utilities	FL	45,200	8.68×
25	City of Lauderhill	FL	55,000	8.63×
26	Lantana Water Treatment Plant	FL	11,558	8.34×
27	Natick Water and Sewer Division	MA	37,006	8.05×
28	Savannah Valley Utility District	TN	30,571	8×
29	MDWASA – Main System	FL	2.4 million	7.86×
30	City of Moses Lake	WA	32,428	7.85×
31	Grand Bay Water Works Board	AL	11,100	7.67×
32	Ridgewood Water	NJ	61,700	7.65×
33	Peoples Water Service Company	FL	24,806	7.5×
34	Parkersburg Utility Board	WV	34,251	7.28×
35	City of Elko	NV	23,000	7.25×
36	City of Pembroke Pines	FL	187,459	7.25×
37	City of Pico Rivera Water Dept.	CA	39,451	7.13×
38	Lafayette Water System	GA	18,177	7.13×
39	City of Greensboro	NC	319,588	6.84×
40	City of Riviera Beach Utility District	FL	46,762	6.75×
41	Brookwood Community Water System	NC	15,380	6.66×
42	Robeson County Water System	NC	67,970	6.5×
43	BCWWS 2A	FL	54,622	6.5×
44	City of Homestead	FL	80,000	6.5×
45	PRASA – Aibonito la Plata	PR	16,354	6.4×
46	City of Hialeah	FL	238,000	6.39×
47	Garden City Water and Sewer System	ID	12,500	6.38×
48	City of Coconut Creek	FL	54,000	6.38×
49	Pico Water District	CA	22,051	6.38×
50	PRASA – Ponce Urbano	PR	113,972	6.33×
51	Dartmouth Water Division	MA	24,696	6.33×
52	City of Abilene	TX	130,501	6.32×
53	City of Norwalk Water Dept.	CA	20,283	6.25×
54	City of Margate	FL	62,254	6.24×
55	Fort Campbell Water System	TN	43,270	6.19×
56	BCWWS 3A	FL	16,046	6.15×
57	Boynton Beach Public Water System	FL	112,000	6.13×
58	Emerald Coast Utilities Authority (ECUA)	FL	242,172	6.04×
59	City of South Gate Water Dept.	CA	88,544	6×
60	University of South Florida Water System	FL	47,586	6×
61	City of Pleasanton	CA	76,689	6×
62	Gadsden Water Works & Sewer Board	AL	44,637	5.86×
63	City of Zephyrhills	FL	29,117	5.85×
64	Tract 180 Mutual Water Company	CA	14,000	5.75×
65	Shelby County Commission-Water Services	AL	40,101	5.75×
66	Town of Elkton	MD	15,625	5.66×
67	Newark Water Department	DE	40,000	5.66×
68	City of Grand Prairie	TX	201,843	5.65×
69	City of Atwater	CA	29,479	5.63×
70	City of Norco	CA	25,068	5.6×
71	Artesian Water Company	DE	231,114	5.56×
72	Northampton Bucks County Municipal Authority	PA	36,750	5.54×
73	City of Huntington Park Water Dept.	CA	15,437	5.5×
74	City of Bell Gardens	CA	11,413	5.5×
75	City of Lynwood Water Dept.	CA	66,967	5.5×
76	Atascadero Mutual Water Company	CA	33,307	5.41×
77	City of Fresno	CA	545,970	5.38×
78	Clanton Water Works & Sewer Board	AL	13,500	5.38×
79	Volusia County – Southwest Water System	FL	19,672	5.38×
80	Hastings Water System	MN	23,222	5.26×
81	City of Porterville	CA	63,487	5.25×
82	BCWWS 3B/C	FL	32,650	5.03×
83	Golden State Water Company – South Arcadia	CA	27,430	5×
84	Orchard Dale Water District	CA	25,000	5×
85	Florida City Water System	FL	13,453	5×
86	BCWWS 1A	FL	75,305	4.95×
87	City of Hallandale Beach	FL	40,000	4.88×
88	Veolia Water Delaware, Inc	DE	100,495	4.83×
89	City of Temple Terrace Utility	FL	31,250	4.76×
90	Aqua Pennsylvania Hatboro	PA	12,901	4.76×
91	Palm Beach County Water Utilities	FL	671,114	4.75×
92	City of Garden Grove	CA	174,226	4.66×
93	City of Modesto	CA	218,915	4.63×
94	City of Hollywood	FL	147,566	4.63×
95	South Brunswick Township Water Division	NJ	45,450	4.63×
96	City of Ceres	CA	54,513	4.63×
97	North Miami Beach Water System	FL	180,000	4.63×
98	City of Vancouver	WA	373,047	4.59×
99	Colbert County Rural Water System	AL	13,449	4.56×
100	EPCOR – San Tan Anthem	AZ	10,362	4.5×

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.