Greenville is continuing a pilot program to control corrosion in its water system after elevated lead levels were found in samples of tap water.
According to a press release issued by the town, testing was conducted from June 19 through June 29. The testing found that more than 10 percent of sample results had lead levels above the action level of 0.015 milligrams per liter, or 15 parts per billion, allowed in drinking water. At least one sample showed 0.101 milligrams per liter, or 101 parts per billion.
Not all homes on the Greenville water system are affected.
During a lead action level event, the Environmental Protection Agency requires identified water systems to test for lead at the tap in certain homes, including those found more likely to have elevated lead levels. If 10% of those samples show water concentrations greater than 0.015 milligrams per liter, the water system must adjust treatment, replace lead service lines and provide public education.
Common sources of lead in drinking water are corrosion of lead pipes or fixtures, either in the water distribution piping or household fixtures and piping. The source can be lead pipes or fixtures; copper piping with lead-based solder, a practice used through 1989; or leaded and chrome-plated brass faucets, which were available through 2014.
As part of its response, Greenville is piloting a new treatment for corrosion control through December.
The same advisory was issued in Greenville in 2025. Testing that year found elevated lead levels in seven of 20 homes.
Identification of the town’s water lines had not turned up any lead lines, but did identify some galvanized copper lines that may use lead solder. The town is continuing to identify the materials in its water system. Residents interested in having their lines identified should contact the town office.
Lead exposure in drinking water can cause health effects in all age groups, including decreased IQ and attention span in children and infants, behavior and learning problems, and health effects during pregnancy. Adults can face increased risks of heart disease, high blood pressure, and kidney or nervous system problems.
What to do if you have elevated levels of lead
Greenville advises that if there are concerns over lead levels, residents should not use hot water from the tap for drinking, cooking or making baby formula. Boiling water does not remove lead from water.
Flush taps every morning, or after extended periods of non-use, for at least one minute or until the water runs cold.
Water can be independently tested at any New Hampshire-certified laboratory. A list of New Hampshire Environmental Laboratory Accreditation Program laboratories is available on the Department of Environmental Services and Greenville town websites. The general cost of testing is between $15 and $25.
To learn what your service line material is, contact Greenville Town Hall at 603-878-2084 or administrator@greenvillenh.org. Contact Town Hall to also learn about construction or maintenance in the area that could disturb your service line.
General health-related questions may be directed to the EPA Safe Drinking Water Hotline at 800-426-4791. General guidelines on ways to reduce the risk from lead in drinking water are available on the EPA’s website, www.epa.gov.