Delhi Jal Board - plz define the logic of inspection fees & service charge ?

Delhi Jal Board is charging sewer inspection fee and service charge. Are DJB are inspecting sewer every month.I have not seen any inspection of sewew by the concerned authority so it is grossly unfair to charege sewer inspection fee on every bill.DGB is also charging service chrge on the bill, one fail to under stand that what extra servic is being provided by the DJB to consumers .On a bill of Rs.131 sewer inspection fee is Rs.78 and service charge is Rs.288 this constitutes the 272% of the actual water charges. This is irrational and defy logic. Why RWAs should not take up the matter with DJB.

Thanks 
SK TALWAR