501st (LWUA) Water Battalion (Reserve)

The 501st (LWUA) Water Battalion (Reserve), known officially as AFP Water Battalion, is one of the affiliated reserve battalions of the Armed Forces of the Philippines, which is organic to the AFP Reserve Command Affiliate Reserve Group of the AFP Reserve Command. It is a Combat Service Support & Service unit specializing in Water treatment, Sewage management, Water distribution, and utilities management, with subspecialties in Urban Search and Rescue, Disaster Relief and Rehabilitation, Civil Military Operations and Co-operations.

Organization
The following are the units that are presently placed under operational control of the 501st (LWUA) Water Battalion (Reserve):

Base units

 * Philippine Army Infantry BC.jpg Headquarters & Headquarters Company

Line units

 * Philippine Army Infantry BC.jpg "A" Water Company
 * Philippine Army Infantry BC.jpg "B" Water Company
 * Philippine Army Infantry BC.jpg "C" Water Company