503rd (MANILA WATER) Water Service Battalion (Reserve)

The 503rd (MANILA WATER) Water Service Battalion (Reserve), known officially as 3rd AFP Water Service 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, Water Distribution, Sewage management, with subspecialties in Urban Search and Rescue, Disaster Relief and Rehabilitation, Civil Military Operations and Co-operations.

It is part of the corporate responsibility arm of the Manila Water Corporation.

Organization
The following are the units that are presently placed under operational control of the 503rd (MANILA WATER) Water Service Battalion (Reserve):

Base units

 * Headquarters & Headquarters Company

Line units

 * "A" Water Service Company
 * "B" Water Service Company
 * "C" Water Service Company