Build a cesspit on your property yourself

With wastewater, both were at €7,600

The system is simply meant to infiltrate. No usage required. And it should be underground.

With us, the lower water authority later wanted the calculation, the plans, and a written certificate that - with us the infiltration basin - was constructed according to the plans. So just inquire informally whether there might be any requirements or similar with you.

With wastewater, both were at €7,600

How much work do you have to do there? For us, it was only about €500 for 6-7m from the house to the transfer shaft.

Wastewater connection to the shaft is about 15m for us. The price refers to rainwater infiltration + wastewater connection

Thank you for the hint.