Philippine Water Works Association (PWWA)
http://www.pwwa-iwaaspac.org.ph

American Water Works Association (AWWA)
http://www.awwa.org

Well Drillers Association of the Philippines (WELDAPHIL)
No website on record

National Water Resources Board (NWRB)
http://www.nwrb.gov.ph

Metropolitan Waterworks & Sewerage Systems (MWSS)
http://www.mwss.gov.ph

Maynilad Water Services, Inc. (MWSI)
Site under development

Manila Water Company, Inc. (MWCI)
http://www.manilawater.com

Department of Interior and Local Government (DILG)
http://www.dilg.gov.ph

Department of Public Works and Highways (DPWH)
http://www.dpwh.gov.ph