Free Maine water report: PFAS & lead levels for every water system, worst-affected cities, and EPA violations. Check your ZIP.
Maine's drinking water serves approximately 1.4 million residents across a state that is among the most rural and well-water-dependent in the nation. Roughly half of Maine's population relies on private wells for their drinking water – one of the highest rates in the country. Public water systems, overseen by the Maine Drinking Water Program within the Department of Health and Human Services, serve the other half through a mix of surface water (lakes, rivers) and community groundwater wells. Portland, the largest city at about 68,000 people, draws from Sebago Lake, one of the cleanest large lakes in the eastern United States. But outside the urban centers along the coast and the I-95 corridor, Maine is a state of small towns, farms, forests, and private wells.
This rural, well-dependent profile is exactly what makes Maine's emerging PFAS crisis so devastating. When contamination comes from a centralized source – a military base, a factory – the affected population can be identified and alternative water provided. When contamination comes from a diffuse source spread across the landscape, and the exposed population draws water from tens of thousands of individual, unmonitored wells, the problem is orders of magnitude harder to map and address.
Maine is experiencing one of the most significant PFAS contamination events in the country, and the primary pathway is unlike most other states: biosolids (sewage sludge) spread on agricultural land.
For decades, Maine encouraged farmers to apply treated wastewater sludge from municipal treatment plants as fertilizer – a practice that was considered environmentally sound and was promoted by the state DEP. That sludge contained PFAS from household products, commercial laundries, and industrial sources that discharged into municipal sewer systems. Once spread on fields, PFAS compounds leached into groundwater, contaminating the wells of the very farms that accepted the sludge.
The scope is staggering. The Maine Department of Environmental Protection has identified over 700 sites where biosolids were applied, and PFAS has been detected in well water, soil, livestock, crops, and milk at affected farms. Some family farms that accepted sludge for years have been forced to shut down dairy operations after their milk tested positive for PFAS at levels exceeding health thresholds.
Maine has responded with some of the most aggressive PFAS action in the nation. In 2021, the legislature passed LD 1911, banning the sale of products containing intentionally added PFAS by 2030 – the first law of its kind in the US. The state has also set a drinking water standard of 20 ppt for the sum of six PFAS compounds, one of the strictest in the country.
Maine's PFAS situation is unique because of the biosolids pathway. While Michigan has 3M contamination and Minnesota has the Cottage Grove site, Maine's contamination is spread across hundreds of rural properties with no single responsible party to fund cleanup. The state has allocated over $60 million in emergency PFAS response funding, but the need dwarfs the available resources.
Among New England states, Maine faces the most severe PFAS challenge. Massachusetts has Joint Base Cape Cod and aggressive state limits. New Hampshire has strict standards and identified contamination near the Pease Air Force Base. Vermont has emerging biosolid concerns similar to Maine's but at a smaller scale. Maine's combination of widespread contamination, high private well dependence, and rural poverty creates a crisis that is both environmentally and socially devastating.
The USGS has been conducting extensive groundwater sampling in Maine as part of federal PFAS response efforts, and the results continue to expand the known extent of contamination.
If you are on a private well in Maine, PFAS testing should be a priority – especially if your property or neighboring properties ever received biosolid applications.
1. Check your location at the homepage. We show available monitoring data and proximity to known biosolid application sites. 2. Test your well. Maine offers subsidized PFAS testing for private wells through the Maine CDC Drinking Water Program. Contact them at the Maine DHHS website for current testing availability and instructions. 3. If PFAS is detected above 20 ppt (Maine's combined standard), the state may provide assistance with treatment systems or alternative water supplies. Point-of-entry treatment systems using granular activated carbon or ion exchange resins can reduce PFAS to below detection limits in most residential well water. 4. Review our water filter guide for certified PFAS treatment options. For a full analysis of your well area, request a detailed water report.
Maine's water quality story took a sharp turn in 2019 when PFAS was detected at alarming levels in well water on a dairy farm in Arundel. The farm had accepted biosolids for years, and the contamination had spread to groundwater, soil, hay, cattle, and milk. The discovery triggered a cascade of testing across the state that has continued to expand the scope of the crisis.
The practice of spreading biosolids on farmland began in the 1970s as an alternative to landfilling wastewater sludge. Maine's DEP actively promoted the practice, issuing licenses and providing guidance. Farmers received free fertilizer; municipalities avoided landfill costs. It seemed like a win-win until the PFAS data arrived.
The human toll has been severe. Farming families have seen their livelihoods destroyed, their land devalued, and their health potentially compromised. The Stoneridge Farm case in Arundel became a national story: the farm's owner had his blood tested and found PFAS levels several times higher than the general population. Several Maine farmers have filed lawsuits against sludge generators and the entities that promoted the practice.
Maine's legislative response has been nationally significant. Beyond the 2030 PFAS product ban, the state has created a PFAS Task Force, established a fund for affected farmers, and directed state agencies to map all known biosolid application sites. Governor Janet Mills signed legislation requiring PFAS testing for all public water systems and establishing screening programs for private wells near known contamination.
The state's surface water systems have largely escaped the biosolid-driven contamination. Portland's Sebago Lake supply tests clean for PFAS, and other lake-based systems have similarly low readings. The crisis is concentrated in groundwater-dependent rural areas – a geographic and socioeconomic pattern that has drawn comparisons to Flint, Michigan, in terms of environmental justice implications.
Check your specific address to see available data for your area. In a state where the contamination source is literally in the soil beneath farms and homes, knowing your local exposure is the first step toward protection.