SENATE BILL REPORT
HB 1615
As of March 14, 2025
Title: An act relating to increasing consistency in the classifications of water systems.
Brief Description: Increasing consistency in the classifications of water systems.
Sponsors: Representative Caldier.
Brief History: Passed House: 3/10/25, 95-0.
Committee Activity: Agriculture & Natural Resources: 3/17/25.
Brief Summary of Bill
  • Prohibits using a default number to calculate the average number of people served by a water system, where use of a default number would cause a water system that would otherwise be classified as a Group B water system to be classified as a Group A water system.
SENATE COMMITTEE ON AGRICULTURE & NATURAL RESOURCES
Staff: Elena Becker (786-7493)
Background:

Public Water Systems. The Safe Drinking Water Act (SDWA) is the federal law that ensures the quality of drinking water supplied by public water systems serving at least 15 connections or 25 individuals. Under the SDWA, state regulatory agencies are generally responsible for implementing drinking water standards and for direct oversight of the operation of public water systems. The Department of Health (DOH) implements Washington's drinking water program as mandated by the SDWA and state laws.

 

Group A and Group B Water Systems. Under state law, a Group A public water system is a public water system that:

  • has 15 or more service connections;
  • serves an average of 25 or more people per day for at least 60 days within a calendar year, regardless of the number of service connections; or
  • serves 1000 or more people for two or more consecutive days.

 

Public water systems that do not meet the definition of a Group A public water system are Group B public water systems. Group A and Group B systems have different requirements for operations, water quality testing, and, in some cases, system design. Local jurisdictions may adopt and implement their own Group B system regulations, so long as they are no less stringent than the rules set forth by DOH.

 

Planning, Engineering, and Design Criteria. By DOH rule, a purveyor must calculate residential population by using a default assumption of 2.5 persons per dwelling unit when submitting a new or expanding Group B system design for approval. If the system is designed to serve ten to fourteen residential service connections, DOH rule requires a purveyor to use the planning, engineering, and design criteria for Group A systems when submitting a new or expanding Group B system design for approval.
Summary of Bill:

A default number may not be used to calculate the average number of people served by a water system, where use of a default number would cause a water system that would otherwise be classified as a Group B water system to be classified as a Group A water system.
Appropriation: None.
Fiscal Note: Available.
Creates Committee/Commission/Task Force that includes Legislative members: No.
Effective Date: The bill contains an emergency clause and takes effect immediately.