Manila Water is one of two concessionaires of the Metropolitan Waterworks and Sewerage System. “Hacked by Blackrain!” read a message on the Manila Water site. Users could not access any part of the website until they click on the “Ok” button on the popup window. The other parts of the site appeared normal, aside from the popup, the other parts appeared normal.Manila Water is a concessionaire of two water concessionaires, along with Maynilad Water.
Source: https://thehackernews.com/2011/04/manila-waters-website-hacked-by.html