PFAS Contamination in Michigan: What Homeowners Need to Know
Michigan has documented PFAS contamination at hundreds of sites. Here's the science, the affected areas, and what filter technologies actually work.
What are PFAS?
PFAS — per- and polyfluoroalkyl substances — are a class of over 12,000 synthetic chemicals developed in the 1940s for their resistance to heat, water, and oil. They were used in non-stick cookware, firefighting foam (AFFF), food packaging, stain-resistant fabrics, and hundreds of industrial processes. They're called 'forever chemicals' because the carbon-fluorine bond is among the strongest in organic chemistry: PFAS do not break down in the environment or the human body.
Michigan context
Michigan has identified PFAS contamination at over 200 sites, including military installations, industrial plants, and landfills. The Ann Arbor water supply (Huron River), Kalamazoo-area wells, and communities near military bases are among the most documented.
Health concerns
The science on PFAS health effects has evolved rapidly since 2016. The EPA lowered its health advisory levels from 70 ppt to near zero for PFOA and PFOS (the two most-studied compounds) in 2022, and finalized a maximum contaminant level (MCL) of 4 ppt for PFOA and PFOS in 2024. Studies have associated long-term PFAS exposure with:
- Thyroid disease and hormone disruption
- Elevated cholesterol levels
- Kidney cancer and testicular cancer
- Reduced vaccine effectiveness (especially concerning for children)
- Pregnancy complications and low birth weight
- Immune system suppression
Where is contamination documented in Michigan?
The highest-profile Michigan PFAS sites include: the Wolverine World Wide tannery contamination in Rockford (PFAS from Scotchgard-treated leather has contaminated wells in Kent County); PFAS from AFFF firefighting foam at Selfridge Air National Guard Base (Macomb County); contamination near the Kalamazoo airport; and documented PFAS in the Huron River, which feeds Ann Arbor's water supply.
What treatment technologies actually work?
This is where specificity matters. PFAS compounds vary in chain length, and different technologies are more or less effective against different PFAS forms.
- Activated carbon (granular activated carbon / GAC): Effective against long-chain PFAS (PFOA, PFOS) when properly sized. Less effective against short-chain PFAS. Most effective at point-of-entry for whole-home treatment.
- Reverse osmosis: Highly effective against PFAS across the board. RO membranes reject PFAS via size exclusion — most PFAS molecules are physically too large to pass through. NSF 58 certified RO systems rated for PFAS reduction are the gold standard at point-of-use.
- Ion exchange (anion resin): Very effective, especially against short-chain PFAS that carbon misses. Not commonly available in residential systems but increasingly relevant.
- UV purification: Does not remove PFAS.
- Softeners: Do not remove PFAS.
- Standard pitcher filters: Most use carbon; effectiveness varies. Some are now NSF 53 certified for PFAS reduction.
Our Ann Arbor protocol
Every Ann Arbor install we do includes whole-home activated carbon (GAC) at the point of entry plus a 5-stage RO under the kitchen sink. The combination addresses both long-chain and short-chain PFAS, provides backup protection if one stage underperforms, and also eliminates chlorine byproducts, TTHMs, and anything else in the Huron River supply.
How do I know if my water has PFAS?
Michigan requires utilities to test for PFAS and report results annually. You can find your utility's PFAS data through the Michigan Department of Environment, Great Lakes, and Energy (EGLE). Private well owners are not covered by utility testing — if you're on a well in a county with known PFAS activity, you should test independently. Testing typically runs $200-400 through a certified laboratory.
What about the health advisory levels?
The EPA's 2024 MCL of 4 ppt (parts per trillion) for PFOA and PFOS is extremely low — for context, 4 ppt is 4 drops in an Olympic-size swimming pool. Most utilities with PFAS detections are working to reduce concentrations but some remain above the new MCL. If your utility reports PFAS detections, even at 'compliant' levels, a point-of-use RO system brings your drinking water exposure to near zero.
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