Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-308 - Biosolids management
Section 173-308-005 - Explanation for the use of the terms "sewage sludge," "biosolids," and "septage."
Current through Register Vol. 24-06, March 15, 2024
(1) Sewage sludge is the solid, semisolid, or liquid residue generated during the treatment of domestic sewage in a treatment works. Biosolids are produced by treating sewage sludge to meet certain quality standards that allow it to be applied to the land for beneficial use. Septage is a class of biosolids that comes from septic tanks and similar systems receiving domestic wastes.
(2) The following sections apply only to biosolids or septage managed as biosolids originating from sewage sludge: WAC 173-308-150, 173-308-160, 173-308-170, 173-308-180, 173-308-200, 173-308-210, 173-308-250, and 173-308-260.
(3) WAC 173-308-270 addresses the management requirements for septage.
(4) Unless the context requires otherwise, all other sections apply to all biosolids, including septage.
Statutory Authority: Chapters 70.95J and 70.95 RCW. 07-12-010 (Order 06-06), § 173-308-005, filed 5/24/07, effective 6/24/07.