In the end, it threatens our viability as well as our and MWSS's ability to provide the services the consumers need and deserve," the company said. In September 2013, the MWSS denied the petition of Maynilad and Manila Water to raise water rates in accordance to its five-year rate rebasing scheme. In July 2013, the MWSS has also passed a resolution stating metro water concessionaires cannot pass on corporate income tax to consumers. This prompted Maynilad and Manila Water to seek arbitration as provided for in their concession agreement.