MAYNILAD WATER SERVICES, INC., PETITIONER, VS. NATIONAL WATER AND RESOURCES BOARD, CENTER FOR POPULAR EMPOWERMENT, KONGRESO NG PAGKAKAISA NG MARALITANG LUNGSOD, KAPISANANG PANLIPUNAN NG COMMONWEALTH, QUEZON CITY, INC., CECIL D. PONCE, EFREN BOSTON, VICTORIA C. GUINTO, ERNESTO L. JAVIER, ANTONIO L. MAGANDI, MANUEL S. MORANTE, ROMY NACARIO, SR., PASARINO A. OCHOCO, FEDERICO V. ROBLES, AND SALVADOR M. SARTING, RESPONDENTS