Public Water Systems by State: UCMR 5 PFAS Results

Every state and territory: the public water systems EPA lists, how many were sampled for PFAS under UCMR 5, and a page for each sampled system with all of its results.

State or territory	EPA region	Systems listed	Sampled under UCMR 5	Map
Alabama	4	524	308	map
Alaska	10	637	30	map
American Samoa	9	10	1	map
Arizona	9	1,150	180	map
Arkansas	6	683	172	map
California	9	4,393	729	map
Colorado	8	1,238	165	map
Connecticut	1	952	65	map
Delaware	3	286	36	map
District of Columbia	3	5	3	map
Florida	4	2,375	409	map
Georgia	4	1,905	256	map
Guam	9	8	5	map
Hawaii	9	132	45	map
Idaho	10	1,017	63	map
Illinois	5	2,207	487	map
Indiana	5	1,367	230	map
Iowa	7	1,197	153	map
Kansas	7	890	103	map
Kentucky	4	388	231	map
Louisiana	6	1,023	268	map
Maine	1	769	41	map
Maryland	3	1,014	83	map
Massachusetts	1	772	263	map
Michigan	5	2,823	324	map
Minnesota	5	1,472	200	map
Mississippi	4	1,089	239	map
Missouri	7	1,664	232	map
Montana	8	1,172	46	map
Nebraska	7	727	53	map
Nevada	9	382	59	map
New Hampshire	1	1,160	51	map
New Jersey	2	1,179	266	map
New Mexico	6	812	90	map
New York	2	2,947	336	map
North Carolina	4	2,287	292	map
North Dakota	8	325	41	map
Northern Mariana Islands	9	48	2	map
Ohio	5	1,695	347	map
Oklahoma	6	987	170	map
Oregon	10	1,300	129	map
Pennsylvania	3	2,900	390	map
Puerto Rico	2	454	99	map
Rhode Island	1	169	29	map
South Carolina	4	641	165	map
South Dakota	8	524	56	map
Tennessee	4	472	277	map
Texas	6	5,706	1,155	map
U.S. Virgin Islands	2	171	3	map
Utah	8	606	130	map
Vermont	1	654	38	map
Virginia	3	1,554	171	map
Washington	10	2,771	254	map
West Virginia	3	473	103	map
Wisconsin	5	1,936	206	map
Wyoming	8	418	34	map

These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.