Wash. Rev. Code § 70A.105.030
(1) Local boards of health shall identify failing septic tank drainfield systems in the normal manner and will use reasonable effort to determine new failures. The local health officer, environmental health director, or equivalent officer may apply for an administrative search warrant to a court official authorized to issue a criminal search warrant. The warrant may only be applied for after the local health officer or the health officer's designee has requested inspection of the person's property under the specific administrative plan required in this section, and the person has refused the health officer or the health officer's designee access to the person's property. Timely notice must be given to any affected person that a warrant is being requested and that the person may be present at any court proceeding to consider the requested search warrant. The court official may issue the warrant upon probable cause. A request for a search warrant must show [that] the inspection, examination, test, or sampling is in response to pollution in commercial or recreational shellfish harvesting areas or pollution in fresh water. A specific administrative plan must be developed expressly in response to the pollution. The local health officer, environmental health director, or equivalent officer shall submit the plan to the court as part of the justification for the warrant, along with specific evidence showing that it is reasonable to believe pollution is coming from the septic system on the property to be accessed for inspection. The plan must include each of the following elements:
[ 1998 c 152 s 1; 1977 ex.s. c 133 s 3. Formerly RCW 70.118.030.]