Wash. Rev. Code § 26.26A.510 (2026)

(1) An order adjudicating parentage must identify the child in a manner provided by law of this state other than this chapter.

(2) Except as otherwise provided in subsection (3) of this section, the court may assess filing fees, reasonable attorneys' fees, fees for genetic testing, other costs, and necessary travel and other reasonable expenses incurred in a proceeding under RCW 26.26A.400 through 26.26A.515. Attorneys' fees awarded under this subsection may be paid directly to the attorney, and the attorney may enforce the order in the attorney's own name.

(3) The court may not assess fees, costs, or expenses in a proceeding under RCW 26.26A.400 through 26.26A.515, against a child support agency of this state or another state, except as provided by law of this state other than this chapter.

(4) In a proceeding under RCW 26.26A.400 through 26.26A.515, a copy of a bill for genetic testing or prenatal or postnatal health care for the woman who gave birth to the child and the child, provided to the adverse party not later than ten days before a hearing, is admissible to establish:

(a) The amount of the charge billed; and

(b) That the charge is reasonable and necessary.

(5) On request of a party and for good cause, the court in a proceeding under RCW 26.26A.400 through 26.26A.515, may order the name of the child changed. If the court order changing the name varies from the name on the birth record of the child, the court shall order the state registrar of vital statistics to amend the birth record.

(6) On request of a party and for good cause, the court in a proceeding under RCW 26.26A.400 through 26.26A.515 may order the parents listed on the birth record of the child changed. If the adjudicated parents listed in the court order vary from the parents listed on the birth record of the child, the court shall order the state registrar of vital statistics to amend the birth record.