Water Resources

Surface Water

Santa Rosa River

Sourced from the watersheds of neighboring Cavite. The river acts as a natural boundary from the municipality of Biñan before it drains into Laguna Lake. DENR categorizes the river as class C, meaning it is only suitable for aquaculture, fisheries, recreation and extraction for industrial uses.

Sourced from the watersheds of neighboring Cavite. The river acts as a natural boundary from the municipality of Biñan before it drains into Laguna Lake. DENR categorizes the river as class C, meaning it is only suitable for aquaculture, fisheries, recreation and extraction for industrial uses.

 

Laguna Lake

Ebbing the northeastern shores of Santa Rosa is the largest lake in the Philippines, Laguna de Bay also referred to as Laguna Lake. The lake has a total surface area of 90,000 hectares, an average depth of 2.8 metres, and a total volume of 3.2 billion cubic meters. There are 21 tributaries contributing to the lake and among these are the rivers of Santa Rosa.

Thus far, the lake is only suitable for aquaculture, fisheries, recreational activities and industrial uses. Although the lake is naturally euphoric and highly productive, it is polluted as a result of human activities in the watershed carried via tributaries or directly into the lake. For example, the discharge of raw sewage into waterways is transported to the lake thus contributing to excessive ammonia, a cause of fish kills.

 

Surface Water Quality

Neither the DENR nor the LLDA monitors Santa Rosa River’s water quality. However, an Environmental Impact Study conducted for the proposal of the Santa Rosa Business Park undertook a water quality study. The study concluded that the Santa Rosa river exhibited very good upstream quality but poor downstream quality.

The lake, however, has undergone extensive and continuing study because of its role as the most significant resource in the area. In 1996, the LLDA conducted a water quality study which monitored several points in the lake and within selected tributary rivers. The station in closest proximity to Santa Rosa was Station 1 or the West Bay located south of the mouth of Pasig River and northeast of the municipality. The study did not include sampling within the municipality itself.

However, since the only outlet for the bay is the Pasig River, it is conceivable that any negative impacts of Santa Rosa to the Lake can somewhat be implied by quality monitored at this point. Temperature stayed within allowable limits as did pH, dissolved oxygen, biological oxygen demand, chemical oxygen demand, nitrate, ammonia, total dissolved solids, total suspended solids, chloride, oil and grease, chromium, and copper.

 

Groundwater

The types of rocks lain beneath the municipality are clastic and alluvium, both known for good water bearing abilities. As such, the area possesses fair to good groundwater resource.

 

Groundwater Quality

The quality of ground water is questionable as a result of waste disposal methods. The municipality generally openly dumps solid waste either in vacant lots, dump sites and waterways while liquid wastes are directly discharged into water bodies. In any case, leachate infiltrates into groundwater sources or intrudes via channels.

Designed and developed by WebFocus Solutions, Inc. and hosted by Servobox.

SiteLock