Hillsborough County, New Hampshire — public water systems

How does Hillsborough County compare with other New Hampshire counties?

Hillsborough County has the 3rd-most active public water systems among the 15 counties listed for active New Hampshire systems in EPA records; among the 10 with 3 or more systems, the median has 250. Its systems report 336,507 people served in total, the largest county figure in the state and 27% of the statewide total. The average system here reports serving 1,206 people, about 138% above the New Hampshire average of 508. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Hillsborough County's drinking water come from?

By primary water source, Hillsborough County's active systems draw on groundwater (264, 95%), purchased surface water (7, 2.5%), surface water (6, 2.2%) and purchased groundwater (2, 0.7%). Overall, 95% rely mainly on groundwater (including purchased groundwater) and 4.7% on surface water, compared with 97% and 2.7% across New Hampshire. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Manchester Water Works, draws primarily on surface water.

What kinds of water systems operate in Hillsborough County?

Hillsborough County's active systems break down as 74 community systems (27%), 83 non-transient non-community systems (30%) and 122 transient non-community systems (44%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (85%), local government (13%), federal government (1.1%) and state government (0.7%).