WAC 246-290-200. Design standards

(1) Purveyors shall ensure that good engineering criteria and practices are used in the design and construction of all public water systems, such as those set out in: (a) Department guidance on design for Group A public water systems; (b) The most recent published edition of the International Building Code (IBC), the Uniform Plumbing Code (UPC), and other national model codes adopted in Washington state; (c) The most recent published edition of Recommended Standards for Water Works, A Committee Report of the Great Lakes - Upper Mississippi River Board of State Public Health and Environmental Managers ; (d) Standard specifications of the American Public Works Association, the American Society of Civil Engineers, AWWA, or the American Society for Testing and Materials; (e) Design criteria, such as contained in current college texts and professional journal articles, acceptable to the department; (f) Chapter 173-160 WAC Minimum Standards for Construction and Maintenance of Wells ; (g) The latest edition of the PNWS-AWWA Cross-Connection Control Manual, or the University of Southern California (USC) Manual of Cross-Connection Control. (2) In addition, purveyors of new or expanding public water systems shall consider and use, as appropriate, the following design factors: (a) Historical water use; (b) Community versus recreational uses of water; (c) Local conditions and/or regulations; (d) Community expectations; (e) Public Water System Coordination Act considerations where appropriate; (f) Provisions for systems and component reliability in accordance with WAC 246-290-420 ; (g) Wind pressures, seismic risk, snow loads, and flooding; (h) Other risks from potential disasters, as feasible; and (i) Other information as required by the department.