Aroostook County, Maine: drinking water report. Aroostook County covers Maine's vast northern region, including Presque Isle, Caribou, Fort Kent, Houlton,…
Aroostook County covers Maine's vast northern region, including Presque Isle, Caribou, Fort Kent, Houlton, and dozens of smaller communities spread across potato farmland and forests. Most residents rely on groundwater from private wells or small municipal systems drawing from aquifers, with some communities along the St. John River using surface water. The county's agricultural character and dispersed population create distinct water quality challenges compared to southern Maine's more urbanized areas.
Groundwater in Aroostook County faces pressure from agricultural operations that have dominated the region for generations. Potato farming relies heavily on pesticides and fertilizers, and decades of application have introduced nitrates, atrazine, and other agricultural chemicals into shallow aquifers. The state's groundwater monitoring data shows detectable pesticide levels in wells across farming regions, with spring runoff periods bringing elevated concentrations as snowmelt carries surface contaminants downward.
Private well owners face particular vulnerability because most systems lack the treatment infrastructure found in municipal supplies. Arsenic occurs naturally in Maine bedrock and appears in wells throughout the county at levels that sometimes exceed EPA standards. The state recommends testing for arsenic, nitrates, bacteria, and pesticides, yet many rural households go years without comprehensive testing. Small public water systems serving villages and towns typically monitor for regulated contaminants, but older infrastructure means lead can leach from service lines and household plumbing, especially in buildings constructed before 1986.
PFAS contamination has emerged as a serious concern across Maine's agricultural regions. The state identified PFAS in biosolids (treated sewage sludge) spread on farmland as fertilizer for decades, and these persistent chemicals have migrated into groundwater in affected areas. While comprehensive PFAS mapping continues, several Aroostook County farms have documented contamination in wells and soil. The state has begun testing private wells near known biosolids application sites, and residents should contact the Maine Drinking Water Program to determine if their property falls within an affected zone.
Private well owners should test annually for bacteria and nitrates, with periodic testing for arsenic, pesticides, and PFAS, especially if located near current or former farmland. Municipal system customers can request their utility's latest Consumer Confidence Report to review detected contaminants and compare results against EPA limits. Check your water for current data on your specific location, review the water filter guide for treatment options matched to your contaminants, request a detailed report covering your water source, and visit the Maine state page for regulatory context and testing resources.