PFAS in South Dakota drinking water
EPA's final UCMR 5 data covers 49 public water systems in South Dakota, serving about 686,544 people. PFAS turned up in 7 of them (14%). 1 averaged above at least one EPA limit at a sampling point, affecting about 4,100 people.
Highest PFOA and PFOS averages among systems serving 1,000 or more: Nps-mount Rushmore National Memorial (0.0 / 10.2 ppt).
Every tested system in South Dakota
Largest first. PFOA and PFOS columns show the average at each system's worst sampling point; EPA's limit for each is 4 ppt. Filter by name:
| Water system | People | PFOA | PFOS | PFAS found | Result |
|---|---|---|---|---|---|
| Sioux Falls · Sioux Falls | 216,462 | - | - | 0 | None found |
| Rapid City · Rapid City | 72,009 | - | - | 1 | Below limits |
| Aberdeen · Aberdeen | 27,989 | - | - | 1 | Below limits |
| Brookings Municipal Utilities · Brookings | 23,377 | - | - | 0 | None found |
| Watertown Municipal Utilities · Watertown | 23,230 | - | - | 0 | None found |
| Web Water Development Association · Aberdeen | 20,750 | - | - | 0 | None found |
| Mitchell · Mitchell | 15,651 | - | - | 0 | None found |
| Yankton · Yankton | 15,411 | - | - | 0 | None found |
| Huron · Huron | 14,263 | - | - | 0 | None found |
| Pierre · Pierre | 14,091 | - | - | 0 | None found |
| Box Elder · Box Elder | 14,000 | - | - | 0 | None found |
| Spearfish · Spearfish | 13,803 | - | - | 0 | None found |
| Minnehaha Community Water Corp · Dell Rapids | 13,435 | - | - | 0 | None found |
| Bon Homme-yankton Rws · Tabor | 13,320 | - | - | 0 | None found |
| Mid-dakota Rural Water · Miller | 11,833 | - | - | 0 | None found |
| Vermillion · Vermillion | 11,695 | - | - | 0 | None found |
| Rapid Valley Sanitary District · Rapid City | 11,408 | - | 1.4 | 2 | Sample at limit |
| Brandon · Brandon | 11,048 | - | - | 0 | None found |
| Harrisburg · Harrisburg | 10,297 | - | - | 1 | Below limits |
| Ellsworth Afb · Ellsworth Afb | 9,100 | - | - | 0 | None found |
| Tea · Tea | 7,381 | - | - | 0 | None found |
| Sturgis · Sturgis | 7,020 | - | - | 0 | None found |
| Kingbrook I Rural Water System · Arlington | 6,455 | - | - | 0 | None found |
| Randall Community Water District · Lake Andes | 6,248 | - | - | 0 | None found |
| Brookings-deuel Rural Water System · Toronto | 6,200 | - | - | 0 | None found |
| Madison · Madison | 6,191 | - | - | 0 | None found |
| Lincoln County Rural Water System · Sioux Falls | 5,965 | - | - | 1 | Below limits |
| Big Sioux Community Water System · Egan | 5,800 | - | - | 0 | None found |
| Brown-day-marshall Rws · Britton | 5,673 | - | - | 0 | None found |
| Belle Fourche · Belle Fourche | 5,617 | - | - | 0 | None found |
| South Lincoln Rural Water System · Beresford | 5,250 | - | - | 0 | None found |
| Grant-roberts Rural Water System · Milbank | 5,050 | - | - | 0 | None found |
| Tripp County Water User District · Winner | 4,860 | - | - | 0 | None found |
| Clay Rural Water System · Wakonda | 4,780 | - | - | 0 | None found |
| Wr/lj - Mni Wiconi · Murdo | 4,720 | - | - | 1 | Below limits |
| Black Hawk Water User District · Black Hawk | 4,500 | - | - | 0 | None found |
| Sioux Rural Water System · Watertown | 4,280 | - | - | 0 | None found |
| Tm Rural Water District · Parker | 4,250 | - | - | 0 | None found |
| Nps-mount Rushmore National Memorial · Keystone | 4,100 | - | 10.2 | 3 | Above limit |
| Eagle Butte · Eagle Butte | 4,000 | - | - | 0 | None found |
| Dell Rapids · Dell Rapids | 3,633 | - | - | 0 | None found |
| Hot Springs · Hot Springs | 3,395 | - | - | 0 | None found |
| Mobridge · Mobridge | 3,261 | - | - | 0 | None found |
| Tri-county Rural Water System · Eagle Butte | 2,190 | - | - | 0 | None found |
| Philip · Philip | 759 | - | - | 0 | None found |
| Wall · Wall | 699 | - | - | 0 | None found |
| Sun Valley Development · Rapid City | 650 | - | - | 0 | None found |
| Tmt, INC. · Pierre | 250 | - | - | 0 | None found |
| Rendezvous Ranch · Black Hawk | 195 | - | - | 0 | None found |
On a private well in South Dakota?
EPA's program only covers public systems. Private wells are never part of UCMR 5, so the only way to know is to test. Our well testing guide covers which lab tests to order, and the best well water systems covers what to install once you have results.
Cite this page
Well & Tap. "PFAS in South Dakota drinking water: results for 49 systems." Data: U.S. EPA UCMR 5, final release August 2026. https://wellandtap.com/pfas/south-dakota/
Source: EPA UCMR 5 final occurrence data (August 2026); population from EPA SDWIS. Method.