PDFWAC 16-229-410
Backflow prevention.
(1) When piping within a permanent mixing/loading site is directly connected to a water source such as a well or public water system, an approved air gap or an approved reduced pressure principle backflow prevention assembly (RPBA) shall be installed to protect the water source. Approved air gaps and approved RPBA's shall be installed, operated, inspected and/or tested and maintained per WAC 246-290-490.
(2) Approved RPBA's shall be inspected and tested once per year by a Washington state department of health certified backflow assembly tester, and approved air gaps shall be inspected by a Washington state department of health certified backflow assembly tester or cross-connection control specialist[:]
(a) At the time of installation, alteration or relocation, and at least on an annual schedule thereafter.
[Statutory Authority: Chapters 15.58 and 17.21 RCW. WSR 00-23-074, § 16-229-410, filed 11/17/00, effective 12/18/00. Statutory Authority: RCW 15.54.800 and 15.58.040. WSR 93-22-093 (Order 5018), § 16-229-410, filed 11/2/93, effective 3/1/94.]
Reviser's note: RCW 34.05.395 requires the use of underlining and deletion marks to indicate amendments to existing rules, and deems ineffectual changes not filed by the agency in this manner. The bracketed material in the above section does not appear to conform to the statutory requirement.