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 Water 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.



[Statutory Authority: RCW 70.119A.180 and 43.20.050. 08-03-061, § 246-290-200, filed 1/14/08, effective 2/14/08. Statutory Authority: RCW 43.02.050 [43.20.050]. 99-07-021, § 246-290-200, filed 3/9/99, effective 4/9/99. Statutory Authority: RCW 43.20.050. 93-08-011 (Order 352B), § 246-290-200, filed 3/25/93, effective 4/25/93; 91-02-051 (Order 124B), recodified as § 246-290-200, filed 12/27/90, effective 1/31/91. Statutory Authority: RCW 34.04.045. 88-05-057 (Order 307), § 248-54-105, filed 2/17/88. Statutory Authority: RCW 43.20.050. 83-19-002 (Order 266), § 248-54-105, filed 9/8/83.]