The map-driven Michigan well problem
PFAS treatment for Michigan well water
PFAS in Michigan wells is a map story, not a statewide one. The documented problems cluster around named sources with named places attached, and the state tracks them through MPART, the Michigan PFAS Action Response Team. If your well sits near a documented site, a certified lab test is the move; if a result is in hand, granular activated carbon and reverse osmosis are the technology classes designed to reduce PFAS. We connect you with an independent licensed contractor who works from your numbers, free.
Reading a full report, not just a PFAS line? Every band is explained in Your Michigan Well Test, Explained.
What are Michigan's PFAS limits?
Michigan has enforced seven PFAS maximum contaminant levels for public water systems since August 3, 2020, per EGLE. They do not bind private wells, but they are the yardstick a private result gets measured against:
| 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 floor moved in 2024, when EPA's national PFAS rule set 4 ppt limits for PFOA and PFOS, tighter than Michigan's 8 and 16. The state has signaled its standards may tighten to follow, so a result that squeaks under Michigan's numbers today is worth judging against the federal ones too.
The named plumes: Michigan's PFAS map in three places
Three sites, all documented by MPART, explain most of what Michigan well owners have heard about PFAS:
Belmont and Rockford, Kent County
Tannery waste from Wolverine World Wide reached residential wells north of Grand Rapids. One private well measured about 37,800 ppt of PFAS, among the highest residential readings recorded in the country, 1,545 wells were tested in the investigation area, and a February 2020 consent decree committed $69.5 million to remedies including municipal water hookups.
Parchment, Kalamazoo County
In July 2018, PFAS totaling about 1,587 ppt in the Parchment municipal system triggered an emergency declaration, a do-not-drink advisory, and a switch to Kalamazoo city water. The surrounding investigation reached private wells outside the city system.
Oscoda and former Wurtsmith Air Force Base, Iosco County
AFFF firefighting foam used in training at the closed base put PFAS into the groundwater around Oscoda, and the investigation there has run for years under MPART and federal oversight.
The pattern to take from the map: distance from a documented source is the strongest predictor. PFAS is not a bedrock story like the Thumb's arsenic, so a well far from any MPART site is a lower-probability case, and a well inside an investigation area deserves a certified test regardless of how the water looks or tastes. The fuller plume narrative, with what each investigation found, lives in the PFAS in Michigan well water guide, and Kent County context is on the Kent County page.
What treatment is designed to reduce PFAS?
Two classes carry independent certification for PFAS reduction claims, and the NSF standards verify the specific claim on the specific model:
Granular activated carbon (GAC)
Carbon media adsorbs PFAS as water passes through, at the tap or for the whole house. The honest fine print is media life: carbon saturates and must be replaced on schedule, or the protection quietly ends. A written maintenance plan belongs in any GAC quote.
Reverse osmosis (RO)
A membrane unit at the kitchen tap, certified under NSF/ANSI standard 58 with PFAS reduction among its verified claims, treats the water a household actually drinks and cooks with. The usual pick for private wells because the exposure that matters is ingestion.
Neither class makes a well plume-proof, and no honest contractor says otherwise: equipment is designed to reduce PFAS to below the benchmarks, verified by follow-up testing. In active investigation areas, ask MPART and your county health department about state-run testing and remedies before spending anything. And if the same report also fails on iron, hardness, or arsenic, fold PFAS into the whole-house treatment conversation rather than bolting on one more gadget.
Check the credentials yourself
Verify your water treatment contractor
You never have to take anyone's word for their credentials, including anyone this site matches you with. Michigan keeps public records for the people and independent listings for the equipment. Four places to look before you sign:
EGLE contractor registration
Michigan registers water well drilling contractors and pump installation contractors through EGLE under Part 127 of the Public Health Code, renewed every year. If a project touches your well or its pump, ask for the registration number and check it with EGLE.
EGLE water well contractor registrationNSF-certified equipment
Certification to an NSF/ANSI standard means an independent lab verified the claim on the label: NSF/ANSI 44 for cation-exchange softeners, 53 for named health contaminants, 58 for reverse osmosis systems. Ask which standard a proposed unit carries, then look the model up in NSF listings.
NSF standards for water treatment systemsYour county health department
County health departments issue well permits, keep well records, and run private well sampling programs. They are the local authority on your well, and MDHHS publishes statewide guidance for well owners. Neither works for any contractor, which is exactly why their answers are useful.
MDHHS well water guidanceEGLE-certified drinking water labs
EGLE certifies the drinking water laboratories whose results Michigan health departments accept. Any treatment quote should be sized from a certified lab report, and EGLE recommends testing for coliform bacteria and nitrate every year.
How to get your water tested, EGLEThree questions worth asking any water treatment contractor
- 1. Are you registered with EGLE for any well or pump work this project involves, and what is the registration number?
- 2. Which NSF/ANSI standard is this equipment certified to, and for which specific contaminant claims?
- 3. Will you size the system from a certified lab result, and will the written quote list the water numbers it was designed around?
Matching through this site is not an endorsement, and these checks work on anyone. A good contractor answers all three without hesitation.
PFAS treatment questions
Do the Michigan MCLs or the federal 4 ppt apply to my private well?
Legally, neither: MCLs bind public water systems, and no agency regulates the water inside a private well. Practically, both are the benchmarks a lab result gets compared against. Michigan has enforced its seven 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 them is a clear reason to act.
I live near one of the named sites. What should I do first?
Contact MPART or your county health department before buying anything. In active investigation areas the state has provided testing, bottled water, filters, or municipal hookups at various stages, and your address may qualify for options that cost you nothing. A certified lab test of your own well is the other first step. Treatment shopping comes after those two calls, not before.
Will boiling or a fridge filter deal with PFAS?
No. Boiling concentrates PFAS as water evaporates, and a standard refrigerator cartridge is not certified for it. The technology classes designed to reduce PFAS are granular activated carbon and reverse osmosis, and NSF certifies specific models for specific PFAS reduction claims. Ask which standard and which claims a proposed unit carries, then look the model up in the NSF listings.
Who installs the PFAS treatment system?
An independent licensed local contractor. Great Lakes Well Water is a free matching service operated by a marketing company: we connect you with a professional who works your county, and that contractor reviews your lab report, quotes carbon or reverse osmosis equipment certified for PFAS reduction in writing, and installs it. Your agreement is directly with the contractor.