Wash. Rev. Code § 90.08.040
Where water rights of a stream have been adjudicated a stream patroller shall be appointed by the director of the department of ecology upon application of water users having adjudicated water rights in each particular water resource making a reasonable showing of the necessity therefor, which application shall have been approved by the district water master if one has been appointed, at such time, for such stream, and for such periods of service as local conditions may indicate to be necessary to provide the most practical supervision and to secure to water users and owners the best protection in their rights.
The stream patroller shall have the same powers as a water master appointed under RCW 90.03.060, but his or her district shall be confined to the regulation of waters of a designated stream or streams. Such patroller shall be under the supervision of the director or his or her designated representative. He or she shall also enforce such special rules and regulations as the director may prescribe from time to time.
RCW 90.08.040
Water masters
appointment, compensation: RCW 90.03.060.
duties: RCW 90.03.070.
power of arrest: RCW 90.03.090.