Metropolitan Waterworks and Sewerage System Regulatory Office (MWSS RO) Principal chemist Isabel Bagaporo (wearing hard hat) conducts a random raw and treated water sampling at the Maynilad Putatan Water Treatment Plant in Muntinlupa City. The RO conducts a regular water quality monitoring program to ensure that millions of Metro Manila residents have access to safe drinking water and in compliance with drinking water standards set in the Philippine National Standards for Drinking Water.