WATER QUALITY REPORT : SEVEN (7) CRATER LAKES

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San Pablo City is a chartered city in the Province of Laguna. It is approximately 70 kilometers away from Metropolitan Manila. It is famous for its Seven Crater Lakes, also known as Maar Lakes namely: Bunot Lake, Calibato Lake, Mohicap Lake, Palakpakin Lake, Pandin Lake, Sampaloc Lake and Yambo Lake. Its catchment area is Mt. San Cristobal with an area of 27.5 square kilometers.

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 (steam-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 which are from 7 meters to 156 meters suggest a volcanic origin. (Ramon B. San Andres – FSLF, Inc.)

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Bunot Lake is used primarily for floating cages operation where most of the resident derived their source of income.

Calibato Lake is the deepest of all the seven lakes with an average depth of 156 meters. It has the greatest volume of water in storage which is approximately 29,600 cubic meters. Calibato Lake supplies the city and nearby towns with abundant fish.

Mohicap Lake is also a major source of tilapia for Metro Manila and suburbs

     

Lake Palaklapakin is the shallowest among the seven lakes, is utilized as communal fishing ground. An increasing construction of fishcages resulted to limited open fishing ground for the fisherfolks.

Pandin Lake and Yambo Lake are known as "The Twin Lakes". Both lakes are considered oligotropic because of their deep clear lakes with low nutrient supplies, high dissolved oxygen level and containing little organic matter. Pandin Lake is San Pablo’s best kept lake.

     
 

Sampaloc Lake Water Quality Report

 
 

Sampaloc Lake is the largest among San Pablo’s Seven Crater Lakes. It is considered one of the prime tourist spots in the city. It abounds with tilapia, big head carp and several species of freshwater fish like ayungin, dalag and hito including shrimps.