Carroll County, New Hampshire: drinking water report. Carroll County spans New Hampshire's Lakes Region and White Mountains, encompassing Conway,
Carroll County spans New Hampshire's Lakes Region and White Mountains, encompassing Conway, Wolfeboro, Ossipee, and several smaller towns popular with tourists and seasonal residents. Most communities rely on private wells or small municipal systems drawing from groundwater, though lakeside towns like Wolfeboro also use surface water from Lake Winnipesaukee and its tributaries. The county's rural character and scattered development create a patchwork of water sources with minimal regional coordination.
New Hampshire's bedrock geology creates natural challenges for well water across Carroll County. Arsenic, uranium, and radon occur naturally in the granite formations underlying much of the region, meaning private well owners face elevated risks that municipal customers typically avoid through treatment systems. The state estimates roughly 10 percent of private wells exceed the federal arsenic standard of 10 parts per billion, with higher rates in areas where bedrock interacts more directly with groundwater. Uranium contamination follows similar patterns, though testing remains voluntary for private wells.
PFAS contamination has emerged as a statewide concern following discoveries at former industrial sites and military installations, though Carroll County's largely undeveloped landscape limits known point sources. The New Hampshire Department of Environmental Services began requiring PFAS testing for public water systems in 2019, and several small systems detected low-level contamination. Private wells remain largely untested for these compounds. The state adopted some of the nation's strictest PFAS standards in 2020, setting maximum contaminant levels at 12 parts per trillion for PFOA and 15 ppt for PFOS, far below the federal standards established in 2024.
Lead exposure risks differ dramatically between older town centers and newer development. Conway's village districts contain housing stock from the 1800s and early 1900s, when lead service lines and lead-based solder were standard. Private well users avoid lead service line concerns but may encounter lead from household plumbing if water chemistry promotes corrosion. The county's soft, slightly acidic water can increase corrosion risks compared to harder water found in other regions.
Private well owners should test for arsenic, uranium, radon, bacteria, and nitrates at minimum, adding PFAS testing if budget allows or if contamination is suspected nearby. Homeowners with older properties served by municipal water should verify whether lead service lines connect their home to the street. Check your water for current contamination data in your area, review our water filter guide for treatment options suited to specific contaminants, download a detailed report showing testing history, or visit the New Hampshire state page for context on statewide water challenges.