Summary
Chapter 246-290 WAC, sets rules for large public water systems. These systems must now keep plans that respond to changing climates. The rule aims to ensure safe drinking water and to protect public health.
For More Information
Statutory Authority: RCW 43.20.050, RCW 70A.125, and RCW 70A.130
State Board of Health Contact: Shay Bauman, shay.bauman@sboh.wa.gov
Department of Health Contact: Mike Means, mike.means@doh.wa.gov
If you would like more information about the Water System Planning, visit the Department of Health’s Water System Planning Requirements webpage.
Additional Background
In the 2023 legislative session, Washington’s legislature passed Engrossed Second Substitute House Bill (E2SHB) 1181 to improve the state’s climate response planning framework. The comprehensive bill includes a section requiring Group A public water systems with 1,000 or more connections to include a climate resilience element in their water system plans. On November 8, 2023, the State Board of Health (Board) granted delegated rulemaking authority to the Department to update and align public water system planning requirements in WAC 246-290-100 with this new legislation.
Adopted Rule
On May 13, 2024, the Department of Health (Department) adopted a rule change to WAC 246-290-100, filed as Washington State Register #24-11-057. The newly adopted rule took effect June 13, 2024.
Before the June 30, 2025, statutory compliance deadline, the Department will complete an update to the Water System Planning Guidebook 331-068. This update provides additional guidance to water systems impacted by the new rule. The department will also provide technical assistance to water systems that must comply with this requirement.
