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(1) An approved double check detector backflow prevention assembly (“DCDA”) shall be the minimum protection on all new fire sprinkler systems using piping material that is not approved for potable water use, and/or that does not provide for periodic flow-through during each 24-hour period. A reduced pressure principle detector backflow prevention assembly (“RPDA”) must be installed, if any solution other than the potable water can be introduced into the sprinkler system. Retrofitting on fire sprinkler systems will be required in each of the following circumstances:

(a) Where improper maintenance has occurred;

(b) On all high hazard systems;

(c) Wherever an inspector deems necessary; and

(d) Wherever required by the WAC.

(2) All fire line systems which are on a designated lateral shall install the assembly on the lateral. The assembly must be installed in accordance with this chapter. (Ord. 550 § 2, 2012)