Because of the problems facing and threatening the potential of the lake, then President Ferdinand Marcos signed into law Republic Act (RA) 4850 in 1966 creating the Laguna Lake Development Authority (LLDA), the main agency tasked to oversee the programs that aimed to develop and protect Laguna de Bay. Though it started as a mere quasi-government agency with regulatory and proprietary functions, its charter was strengthened by Presidential Decree (PD) 817 in 1975 and by Executive Order (EO) 927 in 1983 to include environmental protection and jurisdiction over the surface waters of the lake basin. In 1993, by virtue of the devolution, the administrative supervision of the LLDA was transferred to the DENR by EO 149.