I've talked to folks who insist that flush pressure is directly correlated to water pressure. For some toilets this is true, but generally toilets have a reserv

I've talked to folks who insist that flush pressure is directly correlated to water pressure. For some toilets this is true, but generally toilets have a reservoir which is used to flush the toilet (you can actually flush the toilet completely disconnected from the water source if you fill the tank). EDIT: US households. I don't know about toilet arrangements in other countries.