A map, not a panic
PFAS in Michigan well water: the places, the limits, the plan
Michigan wells with a documented PFAS problem cluster around places with names: Belmont and Rockford north of Grand Rapids, Parchment outside Kalamazoo, Oscoda beside a closed Air Force base. That is the single most useful fact about PFAS in this state. It is a point-source story, mapped site by site by the Michigan PFAS Action Response Team (MPART), not a statewide condition of groundwater, and it rewards a well owner who checks the map before buying anything. This page carries the three defining site histories, the seven limits Michigan enforces, and what each means for a private well.
Where has PFAS actually reached Michigan wells?
Three sites define the private-well story, each documented by MPART with dates and numbers. They are worth reading in order, because together they cover the three ways PFAS arrives: industrial waste, a contaminated public supply, and firefighting foam.
Belmont and Rockford, Kent County: the tannery plume
For decades, tannery waste from Wolverine World Wide was dumped along House Street in Belmont, and the PFAS in it migrated into residential wells north of Grand Rapids. After the contamination surfaced in 2017, more than 1,500 residential wells were sampled in the North Kent investigation, and the worst private well was reported at about 37,800 ppt, described at the time as the highest reading MDHHS toxicologists had seen in a private drinking water well. A consent decree announced in February 2020 directed $69.5 million toward remedies including municipal water for more than 1,000 properties, per the MPART House Street site page and the Michigan AG settlement announcement. The local detail lives on the Kent County page.
Parchment, Kalamazoo County: the 2018 emergency
In July 2018, sampling found PFAS totaling about 1,587 ppt in the Parchment municipal water system, per MPART. The response was immediate: an emergency declaration, a do-not-drink advisory, and a switch to Kalamazoo city water. Parchment matters to well owners because the investigation did not stop at the city meter; private wells around the system were drawn into the sampling, and the episode set the template for how Michigan responds when PFAS surfaces in a drinking water supply.
Oscoda and Wurtsmith Air Force Base, Iosco County: the foam
The former Wurtsmith Air Force Base closed in 1993, but the AFFF firefighting foam used in training there left PFAS in the groundwater around Oscoda, and the investigation has run for years under MPART and federal oversight, per MPART. Wurtsmith is the pattern site for a category that exists near every current and former military installation and airport: where AFFF was used, PFAS in nearby wells is a question worth asking, and the state map is where the answer starts.
What limits does Michigan enforce?
Seven, on the books since August 3, 2020, per EGLE, which made Michigan an early mover among states. Compare each compound on a lab report to its line:
| Compound | Michigan MCL |
|---|---|
| PFNA | 6 ppt |
| PFOA | 8 ppt |
| PFOS | 16 ppt |
| PFHxS | 51 ppt |
| HFPO-DA (GenX) | 370 ppt |
| PFBS | 420 ppt |
| PFHxA | 400,000 ppt |
The federal government followed in 2024 with limits of 4 ppt for PFOA and PFOS, tighter than Michigan's own, and the state has signaled its numbers may tighten to follow. One reading note: these MCLs legally bind public water systems, not private wells. For a well owner they work as reference lines, the numbers a certified result gets compared against, and the full band-by-band walk through a report, PFAS included, lives in Your Michigan Well Test, Explained.
Who should test, and how?
Test if the map says so: an address near a documented MPART site, a health department advisory, or a home purchase near either. The test itself must run through a laboratory certified for PFAS drinking water analysis, since the methods work at parts-per-trillion sensitivity; the EGLE drinking water testing resources and the free well water testing guide cover the routes.
In an active investigation area, the order of calls matters: MPART and the county health department first, lab second, equipment last. The state has provided testing, bottled water, filters, and municipal hookups at various stages of its investigations, and an address inside a mapped area may qualify for options that cost nothing. Buying treatment before making those two calls is spending money the state might have spent for you.
When treatment is the answer
Two technology classes are designed to reduce PFAS: granular activated carbon and reverse osmosis, with NSF certifying specific models for specific reduction claims. Which one, at which tap, and at what size is a decision made from the lab report, the household, and the rest of the water chemistry, because a plume-area well can carry iron and hardness on top of PFAS, and the equipment has to run in the right order. That technology walk lives on the PFAS treatment page, and multi-problem reports belong in the whole-house treatment conversation.
We connect Michigan well owners with independent licensed local contractors who quote PFAS treatment in writing from certified results, free. Request your free match
Michigan PFAS questions
Should every Michigan well owner test for PFAS?
No, and that is the honest answer a matching service can afford to give. Michigan PFAS in private wells is a point-source story: contamination radiates from documented sites, which is why MPART publishes its investigations by name and place. Test if your address sits near a documented site, if your county health department advises it, or if a home purchase makes certainty worth the lab fee. A well in an unaffected county with no site nearby has better uses for its testing budget, starting with the annual coliform and nitrate pair.
Do the Michigan PFAS limits legally apply to a private well?
No. The seven Michigan MCLs bind public water systems, and no agency regulates the water inside a private well. They still matter to well owners as the benchmarks a certified lab result gets compared against: Michigan has enforced its limits on public systems since August 3, 2020, the 2024 federal rule set 4 ppt for PFOA and PFOS, and the state has signaled its numbers may tighten to follow. A private result over any of those lines is a clear reason to act, even though no regulator will make you.
How do I get a PFAS test that a decision can rest on?
Through a laboratory certified for PFAS drinking water analysis, a shorter list than the general certified-lab roster, since PFAS methods run at parts-per-trillion sensitivity. Route through the EGLE drinking water testing resources or your county health department, and in an active investigation area contact MPART first, because state-run sampling may already cover your address at no cost. Home test strips do not exist for PFAS at meaningful levels; this is strictly a certified-lab question.
My result is over a limit. What actually reduces PFAS?
Two technology classes: granular activated carbon and reverse osmosis, with NSF certifying specific models for specific PFAS reduction claims. Boiling concentrates PFAS rather than removing it, and standard refrigerator cartridges are not certified for it. In plume areas, ask MPART and your health department about state-funded options before buying anything. Where equipment is the answer, we connect you with an independent licensed contractor who sizes carbon or reverse osmosis from your lab report and quotes in writing.