Information on the Seven Lakes

Get to know our lakes

San Pablo City has seven freshwater lakes. These lakes (with area in sq.km.) are Sampaloc Lake (1.04); Palakpakin (0.43); Calibato (0.42); Bunot (0.35); Yambo (0.28); Pandin (0.20 ) and Mohicap (0.14). Its catchment area is Mt. San Cristobal with an area of 27.5 sq.km.

Lake Elevation
(meter, asl)
Water Depth
(meter)
Area
(hectares)
Remarks
Mohicap 80 +/- No Data 14.5 Source of Tilapia
Yambo 160 +/- No Data 28.5 For recreation, oligotrophic
Pandin 160 +/- 63.0 max 20.5 Source of tilapia, silted/ polluted
Palakpakin 100 +/- 7.5 max 43.0 Source of tilapia, silted/ polluted
Calibato 170 +/- 135.0 max 42.5 Source of tilapia, silted/ polluted
Bunot 110 +/- 23.0 max 30.5.5 Source of tilapia, silted
Sampaloc 106 27.0 max 104.0 Source of tilapia, polluted in parts

In 1975-76, salinity in Sampaloc Lake was reported to average 42 ppm.  Latest measurements in 2004 show a salinity range from 100 to 200 ppm.

In 1975-76, salinity in Sampaloc Lake was reported to average 42 ppm.  Latest measurements in 2004 show a salinity range from 100 to 200 ppm.   The seven freshwater lakes of San Pablo City were formed by a unique process called phreatic eruption where shallow lava from Mt. San Cristobal intersected groundwater which blew out (stream-heated eruption) the overlying rocks to form a circular and  crater-like depression that eventually filled-up with rainwater. The varying depths of these lakes from 27 meter to 135 meters suggest a volcanic origin. These lakes occur along the paths of migratory birds from the north (China and Japan) and act as important resting grounds for them during the onset of winter. The Lakes are extremely threatened by human influence (illegal squatting along the shores and its resulting pollution) and activities (illegal fish-pens, overfeeding and crowding fish cages) and proposed infrastructures near the lake for commercial purposes. The legal regulations are not enforced by the local government, and/or there is a lack of law enforcement on the lakes where crimes against persons and property are committed.      

Ramon B. San Andres
Consulting Geologist-Geophysicist-Environmentalist
Friends of the Seven Lakes Foundation, Inc.

 

Available Documents/Studies:

  • Sampaloc Lake Action Plan (2000) – A MENRM Term Paper submitted to University of the Philippines (UP) Open University, Los Banos, which contains physical description of the lake, water analysis and social isues about the lakes (pollution, lack of law enforcement, etc).
  • State of Water Resources in San Pablo City (7/19/2001) – Unpublished technical manuscript written regarding the critical geohydrological, social and political issues on the water resources of San Pablo and the causes of water shortages in the city, due to watershed degradation and mismanagement by the local water district.
  • (Hydrological) Evaluation of Water Resources in SPC (6/24/2005) – A short communication manuscript on the hydrological analysis of San Pablo to address water shortages in the city.
  • Evaluation of Open Dumpsite, SPC (7/4/2005) – A short communication manuscript regarding the environmental impact of the open dumpsites to groundwater resources of San Pablo City.
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