011 4181 1888 ,7862099205  gsa@gsa.net.in 16, DDA Flats, Panchsheel Shivalik Mor, Near Malviya Nagar, Delhi - 110017.
 
     
   
 
 
     
   
 
SECTION E : ELECTRICITY, GAS, STEAM AND AIRCONDITION SUPPLY
Division 37 : Sewerage
GroupClassSub-classDescription
370  Sewerage
 3700 Sewerage
  37001The operation and maintenance of sewer systems
  37002Collecting 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.)
  37003Treatment of waste water or sewer by means of physical, chemical or biological processes
 
     
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