Area               : 4,108.74 sq. km.
Region           : NCR, III, IV
Provinces      : Metropolitan Manila, Rizal, Laguna, Quezon, Cavite, Bulacan
Towns/Cities : 95
Barangays      : 2,589
Outlet             : Manila Bay
Est. Pop’n       : 5,756,156 (2007)
RBO                 : Laguna Lake Development Authority (RA 4850) and Pasig River Rehabilitation Commission (EO 54 s. 1999)
RDC Reso.       :
Forestland       : 1,571.87 sq. km.
A&D                  : 2,536.87 sq. km.
NGP Area         : 214.12 sq. km.


  1. San Juan River Watershed (Laguna FLIS)
  2. Sta Cruz Watershed
  3. Balanac Watershed
  4. Lumban Watershed
  5. Sta. Maria-Romero Watershed
  6. Mabacan Watershed
  7. San Cristobal River Watershed (Laguna FLIS)
  8. San Antonio Watershed
  9. Marikina Watershed Reservation
  10. Macabling Watershed
  11. NPC Tailrace & Lewin creek
  12. Llano River Watershed


  1. Mt. Makiling Forest Reserve
  2. University of the Philippines Land Grants


  1. Upper Marikina River Basin Protected Landscape
  2. Mt. Banahaw-San Cristobal Protected Landscape
  3. Makiling Watershed Forest Reserve
  4. Pamitinan Protected Landscape


  1. Laguna de Bay WQMA -declared per Clean Water Act
  2. San Juan River WQMA

The Laguna Lake Development Authority (LLDA) was organized by virtue of Republic Act No. 4850 as a quasi-government agency with regulatory and proprietary functions. Through Presidential Decree 813 in 1975, and Executive Order 927 in 1983, its powers and functions were further strengthened to include environmental protection and jurisdiction over the lake basin’s surface water. In 1993, through Executive Order 149, the administrative supervision over LLDA was transferred from the Office of the President to the Department of Environment and Natural Resources (DENR). LLDA’s power and functions is to catalyze Integrated Water Resource Management in the Laguna de Bay Region, showcasing the symbiosis of man and nature for sustainability, with focus on preserving ecological integrity and promoting economic growth with equitable access to resources.

The Pasig River Rehabilitation Commission (PRRC) was created in January 1999 by virtue of Executive Order No. 54, as amended by Executive Order No. 65 (s. 1999) to ensure that the Pasig River is rehabilitated to its historically pristine condition conducive for the propagation of fishes and other aquatic resources, transport, recreation and tourism. PRRC, shall serve as the authority over all matters pertaining to the rehabilitation of the Pasig River. To achieve this mandate, it shall coordinate, plan, approve, implement, supervise, monitor and or evaluate plans, programs, projects and activities, enforce laws, rules and regulations where appropriate and perform such other functions as are necessary to ensure the rehabilitation of the waterway. In this regard, the Commission shall ensure the upgrading of the river to attain a Class C water quality and the renewal, redevelopment and upgrading of its surrounding urban environment.