35th Civil Engineer Squadron: Water Treatment Plant Published April 1, 2022 By Petty Officer 2nd Class Brian Sipe AFN Misawa Misawa Air Base, Japan -- Armed Forces Network Misawa highlights one of the 35th Civil Engineer Squadron water treatment plants here at Misawa Air Base, Japan. The purpose of the water treatment plant is to process water from various sources into clean water safe for human consumption for personnel on base.