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PDFWAC 16-202-1023

Public water system cross-connections or connections to a potable water supply intended for human use.

(1) If the irrigation system is cross-connected to a public water system, Washington state department of health (DOH) rules (WAC 246-290-490) apply to backflow prevention.
(2) Cross-connections of a chemigation system to any potable water system intended for human use must have either a department of health-approved reduced pressure backflow assembly or reduced pressure detector assembly installed for backflow prevention. Otherwise, a physical separation in the form of an air gap may be used to protect the water source.
[Statutory Authority: Chapters 15.54, 15.58, 17.21, and 34.05 RCW. WSR 01-23-018, ยง 16-202-1023, filed 11/9/01, effective 11/9/01.]
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