2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...

Sections 7 and 9, and Details Section 300. These standards are primarily based on AWWA
industry standards.
5.3.2.2 King County
All water system works are subject to the provisions and requirements of Title 12 of the King
County Board of Health Code.
5.3.2.3 Washington State Department of Health
The Washington State Department of Health (DOH) is the regulatory agency that ensures that
water systems comply with system capacity requirements of the federal Safe Drinking Water Act
(SDWA). Authority to regulate the public water supply system is granted under Washington
Administrative Code (WAC), Chapter 246-290 "Public Water Supplies," also known as the Public
Water System Rule. A key term under the rule is system capacity, which is defined as having the
technical, managerial, and financial capacity to achieve and remain in compliance with all
applicable local, state and federal regulations.
A. Water System Plan
The public water system rule (WAC 246-290) includes the Washington State Legislatureapproved
Municipal Water Law and the federal law, Long Term 2 Enhanced Surface
Water Treatment Rule. DOH requires water purveyors to submit a Water System Plan to
ensure water quality and protection of public health (WAC 246-290-100 and WAC 246-
291-140, respectively). SPU’s Water System Plan was last updated in 2007.
Water systems plans must be updated every 6 years. If a purveyor installs distribution
lines or makes other improvements and the project requires State Environmental
Protection Act (SEPA) analysis, a water system plan amendment is required (WAC 246-
03-030[3][a]) before construction.
B. Water System Design Manual
The Washington State DOH Water System Design Manual (December 2009) provides
guidelines and criteria for design engineers to use for preparing plans and specifications
for Group A water systems, such as SPU, to comply with the Group A Public Water
Supplies (chapter 246-290-WAC). This manual delineates mandatory requirements of
the WAC that must be adhered to by SPU. Design engineers may use design approaches
other than those in this manual as long as they do not conflict with chapter 246-290
WAC. DOH will expect the design engineer to justify the alternate approach used and
the criteria that apply.
5.3.2.4 Other
Recommended Standards for Water Works (10-States Standards) – Part 7, Finished Water
Storage is a source for water storage design.
5.3.2.5 Federal Safe Drinking Water Act
The Safe Drinking Water Act (SDWA) protects public health by regulating the nation's public
drinking water supply. The law requires many actions to protect drinking water and its sources.
SDWA does not regulate private wells that serve fewer than 25 individuals. SDWA authorizes the
5-12 SPU Design Standards and Guidelines