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Private and Public Systems
The following is an excerpt from the Washington Administrative Code (WAC) discussing differences between Group A and Group B public water systems and categorizing different types of Group A public water systems.
Excerpts from WAC 246-290-020:
Public water system shall mean any system, excluding a system serving only one single-family residence and a system with four or fewer connections all of which serve residences on the same farm, providing piped water for human consumption, including any:
(a) Collection, treatment, storage, or distribution facilities under control of the purveyor and used primarily in connection with such system; and
(b) Collection or pretreatment storage facilities not under control of the purveyor primarily used in connection with such system.
A Group A system shall be defined as a public water system:
(a) With fifteen or more service connections, regardless of the number of people; or
(b) Serving an average of twenty-five or more people per day for sixty or more days within a calendar year, regardless of the number of service connections.
Group A water systems are further defined as community and noncommunity water systems.
(a) Community water system means any Group A water system:
(i) With fifteen or more service connections used by residents for one hundred eighty or more days within a calendar year, regardless of the number of people; or
(ii) Regularly serving twenty-five or more residents for one hundred eighty or more days within the calendar year, regardless of the number of service connections.
Examples of a community water system might include a municipality, subdivision, mobile home park, apartment complex, college with dormitories, nursing home, or prison.
(b) Noncommunity water system means a Group A water system which is not a community water system. Noncommunity water systems are further defined as:
(i) Nontransient (NTNC) water system which regularly serves twenty-five or more of the same nonresidents for one hundred eighty or more days within a calendar year.
Examples of a NTNC water system might include a school, day care center, or a business, factory, motel, or restaurant with twenty-five or more employees on-site.
(ii) Transient (TNC) water system which:
(A) Has fifteen or more service connections used less than one hundred eighty days within a calendar year; or
(B) Serves twenty-five or more different nonresidents for sixty or more days within a calendar year; or
(C) Serves twenty-five or more of the same nonresidents for sixty or more days, but less than one hundred eighty days within a calendar year; or
(D) Serves twenty-five or more residents for sixty or more days, but less than one hundred eighty days within a calendar year.
Examples of a TNC water system might include a restaurant, tavern, motel, campground, state or county park, an RV park, vacation cottages, highway rest area, or church.
(c) A Group B water system is
a public water system which does not meet the definition of a
Group A water system.
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