PFAS in South Dakota tap water

2 of 49 tested systems measured above the federal limit. 7 had a detection of any kind.

Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.

Water system	Highest PFOA	Highest PFOS	Found	Against the 4 ppt limit
Nps-mount Rushmore National Memorial	none detected	10.6 ppt	3 of 29	Above
Rapid Valley Sanitary District	none detected	5.7 ppt	2 of 29	Above
Aberdeen	none detected	none detected	1 of 29	Within
Belle Fourche	none detected	none detected	0 of 29	Within
Big Sioux Community Water System	none detected	none detected	0 of 29	Within
Black Hawk Water User District	none detected	none detected	0 of 29	Within
Bon Homme-yankton Rws	none detected	none detected	0 of 29	Within
Box Elder	none detected	none detected	0 of 29	Within
Brandon	none detected	none detected	0 of 29	Within
Brookings Municipal Utilities	none detected	none detected	0 of 29	Within
Brookings-deuel Rural Water System	none detected	none detected	0 of 29	Within
Brown-day-marshall Rws	none detected	none detected	0 of 29	Within
Clay Rural Water System	none detected	none detected	0 of 29	Within
Dell Rapids	none detected	none detected	0 of 29	Within
Eagle Butte	none detected	none detected	0 of 29	Within
Ellsworth Afb	none detected	none detected	0 of 29	Within
Grant-roberts Rural Water System	none detected	none detected	0 of 29	Within
Harrisburg, Sd	none detected	none detected	1 of 29	Within
Hot Springs	none detected	none detected	0 of 29	Within
Huron	none detected	none detected	0 of 29	Within
Kingbrook I Rural Water System	none detected	none detected	0 of 29	Within
Lincoln County Rural Water System	none detected	none detected	1 of 29	Within
Madison	none detected	none detected	0 of 29	Within
Mid-dakota Rural Water	none detected	none detected	0 of 29	Within
Minnehaha Community Water Corp	none detected	none detected	0 of 29	Within
Mitchell	none detected	none detected	0 of 29	Within
Mobridge	none detected	none detected	0 of 29	Within
Philip	none detected	none detected	0 of 29	Within
Pierre	none detected	none detected	0 of 29	Within
Randall Community Water District	none detected	none detected	0 of 29	Within
Rapid City	none detected	none detected	1 of 29	Within
Rendezvous Ranch	none detected	none detected	0 of 29	Within
Sioux Falls	none detected	none detected	0 of 29	Within
Sioux Rural Water System	none detected	none detected	0 of 29	Within
South Lincoln Rural Water System	none detected	none detected	0 of 29	Within
Spearfish	none detected	none detected	0 of 29	Within
Sturgis	none detected	none detected	0 of 29	Within
Sun Valley Development	none detected	none detected	0 of 29	Within
Tea	none detected	none detected	0 of 29	Within
Tm Rural Water District	none detected	none detected	0 of 29	Within
Tmt, Inc.	none detected	none detected	0 of 29	Within
Tri-county Rural Water System	none detected	none detected	0 of 29	Within
Tripp County Water User District	none detected	none detected	0 of 29	Within
Vermillion	none detected	none detected	0 of 29	Within
Wall	none detected	none detected	0 of 29	Within
Watertown Municipal Utilities	none detected	none detected	0 of 29	Within
Web Water Development Association	none detected	none detected	0 of 29	Within
Wr/lj - Mni Wiconi	none detected	none detected	1 of 29	Within
Yankton	none detected	none detected	0 of 29	Within

All 49 systems the EPA tested in South Dakota, every one of them with its own page. Each was tested for 29 PFAS compounds.

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Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →