This class includes :

Operation of sewer systems or sewer treatment facilities

Collecting and transporting of human or industrial wastewater from one or several users, as well as rain water by means of sewerage networks, collectors, tanks and other means of transport (sewage vehicles, etc.)

Emptying and cleaning of cesspools and septic tanks, sinks and pits from sewage; servicing of chemicals toilets

Treatment of wastewater (including human and industrial wastewater, water from swimming pool, etc.) by means of physical, chemical and biological processes like, dilution, screening, filtering, sedimentation etc.

Maintenance and cleaning of sewers and drains, including sewer rodding