You must ensure that all automatic sprinkler systems are continuously maintained in reliable operating condition at all times, and such periodic inspections and tests are made as are necessary to assure proper maintenance.
Wash. Admin. Code § 296-24-56525
Order 73-5, § 296-24-56525, filed 5/9/73 and Order 73-4, § 296-24-56525, filed 5/7/73.