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| SECTION E : ELECTRICITY, GAS, STEAM AND AIRCONDITION SUPPLY | | Division 37 : Sewerage | | Group | Class | Sub-class | Description | | 370 | | | Sewerage | | | 3700 | | Sewerage | | | | 37001 | The operation and maintenance of sewer systems | | | | 37002 | Collecting and transporting of human or industrial waste water or rain water by means of sewerage networks, collectors, tanks and other means of transport (sewage vehicles etc.) | | | | 37003 | Treatment of waste water or sewer by means of physical, chemical or biological processes |
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