619,000 km sewer network

619,000 kilometers is the total length of the German sewer network.

By the way, there are mainly three different types of sewer networks in Germany: Combined sewer (~250,000 km), stormwater (~144,000 km) and wastewater (~225,000 km). The latter two are still growing significantly.

Source: Länge und Art des Kanalnetzes – Statistisches Bundesamt

Photo: https://pixabay.com/de/photos/schild-tetraeder-warnung-kanal-1891761/