LAUREL, Batangas: Environmental agencies have found higher-than-desired levels of contaminants in water samples taken from the Tabanga River in Barangay Poblacion, one of the tributaries flowing into Taal Lake. We are conducting water quality monitoring of the tributaries of Taal Lake because it is part of the TVPL (Taal Volcano Protective Landscape) Management Plan, and at the same time, we can also assess the current status of the water quality of the rivers, Gina Medanilla, senior environmental management specialist of the Provincial Government Environment and Natural Resources Office (PGenro), said in an interview on Saturday.