3700 Sewerage

This subcategory includes:

• sewage removal services usually provided using equipment such as waste pipes, sewers or drains
• sewage treatment services (including human and industrial wastewater, water from swimming pools etc.) by means of physical, chemical and biological processes like dilution, screening, filtering, sedimentation etc.
• maintenance and cleaning services of sewers and drains, including sewer rodding

This subcategory also includes:

• operation services of wastewater treatment facilities for reuse of e.g. agricultural, industrial, road cleaning wastewater or collected rainwater, or for artificial recharge or augmentation of groundwater bodies
• collection and transportation services of rainwater by means of sewerage networks, collectors, tanks and other means of transport (sewage vehicles etc.)

This subcategory excludes:

• collection or purification of water, see 36.00
• distribution of water through mains, see 36.00.21
• further treatment services of sludge extracted from waste water, see division 38
• anaerobic digestion, see 38.2
• aerobic treatment like composting, see 38.21
• incineration with energy recovery, see 38.22
• incineration without energy recovery, see 38.31
• construction, repair and alteration of sewers, see 42.21.2

This subcategory includes:

• emptying and cleaning of cesspools and septic tanks
• servicing of chemical toilets

This subcategory excludes:

• decontamination services of groundwater and surface water at the place of pollution, see 39.00.11 , 39.00.12 respectively
• cleaning and deblocking of drainpipes in buildings, see 43.22.11
• rental services of portable toilets see 77.39