37.00 — Sewerage

This class includes: - operation of wastewater treatment facilities for reuse (e.g. of agricultural, industrial and road cleaning wastewater or collected rainwater), or for artificial recharge or augmentation of groundwater bodies - collection and transport of wastewater from users (e.g. households or industrial units) - collection and transport of rainwater by means of sewerage networks, collectors, tanks and other means of transport (e.g. sewage vehicles, etc.) - maintenance and cleaning of sewers and drains, including sewer rodding

This class also includes: - freeze-drying of sewage sludge by wastewater treatment plants - emptying and cleaning of cesspools and septic tanks, sinks and pits from sewage - servicing of chemical toilets

This class excludes: - further treatment of sludge extracted from wastewater, see division 38 • anaerobic digestion, see 38.2 • aerobic treatment, such as composting, see 38.21 • incineration with energy recovery, see 38.22 • incineration without energy recovery, see 38.31 - decontamination of surface water and groundwater at the place of pollution, see 39.00 - construction or repair of sewerage systems, see 42.21 - cleaning and unblocking of drainpipes in buildings, see 43.22 - rental of portable toilets, see 77.39