Lewis County, Washington — public water systems

How does Lewis County compare with other Washington counties?

Lewis County has the 11th-most active public water systems among the 72 counties listed for active Washington systems in EPA records; among the 44 with 3 or more systems, the median has 75. Its systems report 89,186 people served in total, the 17th-largest county figure in the state and 0.9% of the statewide total. The average system here reports serving 537 people, well below the Washington average of 2,172. 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 Lewis County's drinking water come from?

By primary water source, Lewis County's active systems draw on groundwater (157, 95%), surface water (8, 4.8%) and purchased surface water (1, 0.6%). Overall, 95% rely mainly on groundwater (including purchased groundwater) and 5.4% on surface water, compared with 94% and 5.7% across Washington. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Centralia Public Works - Water, draws primarily on groundwater.

What kinds of water systems operate in Lewis County?

Lewis County's active systems break down as 51 community systems (31%), 17 non-transient non-community systems (10%) and 98 transient non-community systems (59%). 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 (70%), local government (22%), state government (3.6%) and federal government (3.6%).