law: Water (Prevention & Control of Pollution) Cess Act, 1977
  10. Interest payable for delay in payment of
  
  cess
  If any person carrying on any specified
  
  industry or any local authority fails to pay any amount of cess payable under
  
  section 3 to the State Government within the date specified in the order of
  
  assessment made under section 6, such person or local authority, as the case
  
  may be, shall be liable to pay  6[interest on the amount to be paid at the
  
  rate of two per cent, for every month or part of a month comprised in the
  
  period from the date on which such payment is due till such amount is actually
  
  paid.]