Water System Classifications
- Group A Public Water System is classified as a community system with 15 or more
connections or serves greater than 25 or more people per day for 60 days or more per year.
- Group B Public Water System is classified as a community system with
3 to 14 connections
and less than 25 people per day or serves 25 or more people per day during fewer than 60 days per year.
- 2-Party Public Water System
is classified as a community system with 2
single-family residential connections. Although
classified as a Group B water system, it has a
different set of regulations than those with 3
or more connections.
- Non-Public Well is classified as a single-family well with 1 single family residential connection or irrigation well.
Group A systems are regulated by the Washington State Department of Health, Drinking Water Division (S.W. Drinking Water Operations, 360-664-9280). In
cooperation with DOH, Thurston County performs well siting inspections for new wells and sanitary surveys for small Group A systems. ...more
Group B water systems (see classification above) in Thurston County are regulated by the
County Environmental Health Division. ...more
One well serving two residences is considered a Group B public water supply, but is placed in a separate classification as it has a different
set of regulations than those with 3 or more connections....more
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