A+ grade
RA 4226 - -Hospital Licensure Act (1965)
RA 6969 - -An Act to Control Substances and Hazardous and Nuclear Wastes (1990)
RA 8749 - -The Philippine Clean Air Act of 1999
RA 9003 - -Ecological Solid Waste Management Act of 2000
RA 9275 - -The Philippine Clean Water Act of 2004
PD 813 and EO 927 - -Strengthening the Functions of Laguna Lake Development
Authority (LLDA) (1975 and 1983)
PD 856 - -The Code on Sanitation of the Philippines - Chapter XVII on Sewage Collection
and Excreta Disposal (1998)