If a house is built with a Sewage/Septic tank, There should be no Indah Water bills. And every time when that tank needs clearing, the owner have to call Indah Water to send a tanker over to suck out the gunk and pay that bill.

If a house that is connected to the Indah Waters sewage, then a monthly bill. So if the system now backout. A tanker is needed before any repairs can be done, Who pay that bill?