No PFAS were detected in any of the 4 samples EPA's program collected.
Mid-dakota Rural Water is a public water system drawing on surface water, based in Miller, South Dakota, serving about 11,833 people, including Alpena, Carpenter, Cavour, Gann Valley, Highmore, Stephan. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 4 times across 1 sampling point between Jan 2023 and Oct 2023.
None of the 29 PFAS were found at or above EPA's minimum reporting levels (2 to 20 ppt depending on the compound).
Not detected: ADONA, PFDoA, PFHxA, PFDA, PFOA, PFOS, PFNA, 11Cl-PF3OUdS, HFPO-DA, 9Cl-PF3ONS, 8:2 FTS, PFBS, PFHxS, PFPeS, PFUnA, 6:2 FTS, PFMPA, PFHpS, PFMBA, NFDHA, PFEESA, PFPeA, 4:2 FTS, PFBA, PFHpA, NMeFOSAA, PFTA, PFTrDA, NEtFOSAA.
Lithium, tested in the same program: highest 60 ppb, detected in 4 of 4 samples. EPA's health-based screening level is 10 ppb.
In April 2024 EPA set enforceable limits of 4 ppt for PFOA and PFOS, 10 ppt each for PFHxS, PFNA and GenX, and a hazard index of 1 for mixtures. Utilities were given until 2029 to comply. In May 2026 EPA proposed keeping only the PFOA and PFOS limits and moving that deadline to 2031. Until that proposal is final, the 2024 limits stand.
Compliance is judged on a running annual average at each entry point, so we show the average at this system's worst sampling point next to its single highest result. UCMR 5 results do not by themselves put a utility in or out of compliance.
No PFAS action is needed on these results. If your water tastes or smells of chlorine, a whole-house city water filter is the usual fix.
All 49 tested systems in South Dakota
57312 57322 57324 57341 57345 57346 57348 57350 57353 57358 57359 57362 57371 57373 57379 57381 57382 57384 57385 57386 57399 57442 57450 57455 57466 57467 57469 57470 57475 57476 57501 57520 57522 57536 57540 57564
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Well & Tap. "PFAS in Mid-dakota Rural Water water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID SD4602175. https://wellandtap.com/pfas/south-dakota/mid-dakota-rural-water/
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID SD4602175). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
