WAC 246-291-230   Treatment design and operations.  (1) Finished water quality from existing and proposed sources of supply shall conform to the minimum water quality standards established in this chapter.

     (2) Predesign studies shall be required for proposed surface water and GWI treatment and may be required for groundwater treatment. The goal of the predesign study shall be to establish the most acceptable method to produce satisfactory finished water quality.

     (3) Treatment of groundwater sources shall be as determined by the department.

     (4) The minimum level of treatment for new or expanding surface water and GWI sources approved after the effective date of these regulations shall be coagulation, flocculation, filtration, and disinfection unless otherwise approved by the department.

     (5) The minimum level of treatment for existing nonexpanding surface water and GWI sources approved prior to the effective date of these regulations shall be filtration and disinfection.

     (6) Disinfection methods, other than chlorination, i.e., ozonation or ultraviolet radiation, may be approved by the department with appropriate engineering justification.

     (7) The owner shall ensure that the system is operated in accordance with good operations procedures such as those listed in the department guideline titled Group B Water System Approval.

     (8) The owner shall ensure that no bypass is established or maintained to divert water around any feature of a treatment process, except by written approval from the department.



[Statutory Authority: RCW 43.20.050. 94-14-002, § 246-291-230, filed 6/22/94, effective 7/23/94.]