Washington Constitution Art. 4, § 13.

No judicial officer, except court commissioners and unsalaried justices of the peace, shall receive to his own use any fees or perquisites of office. The judges of the supreme court and judges of the superior courts shall severally at stated times, during their continuance in office, receive for their services the salaries prescribed by law therefor, which shall not be increased after their election, nor during the term for which they shall have been elected. The salaries of the judges of the supreme court shall be paid by the state. One-half of the salary of each of the superior court judges shall be paid by the state, and the other one-half by the county or counties for which he is elected. In cases where a judge is provided for more than one county, that portion of his salary which is to be paid by the counties shall be apportioned between or among them according to the assessed value of their taxable property, to be determined by the assessment next preceding the time for which such salary is to be paid.