Maynilad maintains and operates 20 wastewater treatment plants that process wastewater and sludge collected from customers. This is to prevent the pollution of waterways and bodies of water.

The company’s Dagat-Dagatan Sewage and Septage Treatment Plant in Caloocan is the first facility of its kind in the Asia-Pacific Region to attain triple international standard accreditations on Quality Management (ISO 9001:2008) and Environmental Management (ISO 14001:2004) in January 2007, and Occupational Safety and Health Management (OHSAS 18001:2007).