PFAS in Maine Well Water

Maine's PFAS contamination crisis is unique in the country: decades of spreading treated sewage sludge on farmland put "forever chemicals" into groundwater across the state.

What Are PFAS?

PFAS (per- and polyfluoroalkyl substances) are a family of thousands of synthetic chemicals used in nonstick cookware, water-resistant clothing, food packaging, firefighting foam, and many industrial processes. They're called "forever chemicals" because they don't break down in the environment — once they're in groundwater, they stay.

PFAS have been linked to:

• Cancer — kidney cancer, testicular cancer
• Thyroid disease
• Immune system effects — reduced vaccine response, especially in children
• Reproductive effects — reduced fertility, pregnancy complications
• Liver damage
• Elevated cholesterol

The Maine Sludge Story

Maine's PFAS crisis has a specific origin: treated sewage sludge spread on farmland.

Starting in the 1970s, Maine promoted the practice of spreading treated municipal sewage sludge ("biosolids") on agricultural land as fertilizer. It was presented as a win-win: farmers got free fertilizer, and wastewater treatment plants got rid of their waste. The practice was encouraged by state and federal agencies.

What nobody knew — or acknowledged — was that the sludge contained PFAS from industrial and household sources flowing into municipal sewer systems. Every time sludge was spread on a field, PFAS accumulated in the soil. Over years and decades, PFAS leached through the soil into groundwater, contaminating private wells downhill and downstream.

Affected Areas

PFAS contamination from sludge spreading has been documented across Maine, with particularly significant cases in:

• Arundel / York County — Stoneridge Farm; dairy farm forced to close, neighboring wells contaminated
• Fairfield / Somerset County — multiple farms with documented PFAS from sludge
• Unity / Waldo County — PFAS in wells near former sludge-application sites
• Kennebec Valley — widespread sludge application on agricultural land
• Aroostook County — potato farms that received sludge

The Maine DEP maintains a map of known and suspected sludge-application sites and is actively investigating. New sites are being identified regularly.

Other PFAS Sources

Sludge spreading is the biggest source of PFAS in Maine groundwater, but it's not the only one:

• AFFF firefighting foam — used at airports, military bases, and fire training facilities. Bangor International Airport is a known source.
• Industrial discharges — facilities that used or manufactured PFAS-containing products
• Landfills — PFAS-containing products in landfills can leach into groundwater
• Septic systems — household products containing PFAS (cleaners, fabric treatments) enter septic systems and can reach groundwater

Testing for PFAS

If you're not near a known site but want to test anyway, PFAS testing is available through private labs for approximately $200-$400. It's more expensive than most water tests because PFAS analysis requires specialized equipment (LC-MS/MS).

Maine's interim drinking water standard is 20 parts per trillion (ppt) for the sum of six PFAS compounds. The EPA finalized national standards in 2024 at 4 ppt for PFOA and PFOS individually.

Treatment Options

Treatment	Typical Cost	Notes
Point-of-use reverse osmosis	$200-$600 + installation	Effective for PFAS at the kitchen sink. Most practical first step.
Whole-house granular activated carbon (GAC)	$1,500-$5,000	Effective for PFAS. Carbon needs replacement periodically.
Whole-house ion exchange resin	$2,000-$6,000	Highly effective for PFAS. Resin regeneration or replacement needed.
Whole-house reverse osmosis	$4,000-$15,000+	Most thorough but most expensive. Removes PFAS and most other contaminants.

The Human Cost

Maine's PFAS crisis has devastated families and farms. Organic farmers who spent years building their land discovered their soil was poisoned by chemicals they never applied. Dairy farms were forced to close when their milk tested positive for PFAS. Homeowners learned that the well water they'd been drinking for years — water that looked, tasted, and smelled perfectly fine — contained chemicals linked to cancer.

This is an ongoing crisis. New contamination sites are being discovered regularly. If you're on a private well in Maine, especially near agricultural land, PFAS testing should be on your list.