Provides that manufacturers of biological remediation technologies for use in on-site sewage disposal systems, including for use in the repair or recovery of failed drain fields of on-site sewage disposal systems, are exempted from registering their proprietary treatment products with the department, only if the following conditions are met: (1) Product performance is verified through product testing using international association of plumbing and mechanical officials interim guide criteria standard 180-2003, which relates to aerobic bacterial generators for insert into septic tanks, grease interceptors, and grease traps;

(2) Product performance is verified through product testing conducted by a testing facility conforming with the American national standards institute approved international association of plumbing and mechanical officials requirements;

(3) The product continues its certification under the international association of plumbing and mechanical officials interim guide criteria standard 180-2003; and

(4) The biological component of the product must meet the conditions of RCW 70.118.060 relating to additive regulation.