Rainwater - instead of infiltration now separation system - additional costs?

For cities and municipalities, a separation system is a money machine that provides them with regular income through the notice on property taxes. The initial investment in the additional channel therefore pays off – not only for the authorized companies, which are exclusively allowed to lay the public channel on public land :-( Friendly regards

Sorry, but I would like to disagree with that: Normally, sewage treatment plants are municipal institutions that do not make a profit. If a surplus or deficit is reported for the year, it is carried over to the next year. The municipality usually does not withdraw capital from the property. The differences (deficit / surplus) are directly reflected in the water price / wastewater price. If more is paid for drainage, the water price will be correspondingly cheaper. So if it is a municipal property, it is not about ripping off the citizens – what advantage would the municipality have from that? I am not familiar with private or semi-private sewage treatment plants.