Ostrava’s sewer network is 1 057 km in length (including house drains). It removes waste water from domestic and industrial premises. The majority of the public sewer system is a combined system (both waste water and surface runoff), though separate sewerage systems have been installed in some recently built areas. The city’s sewer network consists of several subsystems supplying waste water treatment plants or carrying waste water direct to a recipient body of water.
Ostrava is expanding its sewer network to serve a number of outlying districts (municipalities), connecting them to the central waste water treatment plant. Sewer maintenance uses modern technologies including pressure and combined trucks as well as camera systems.