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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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