law: Water (Prevention and Control of Pollution) Act, 1974
  29. Revision.
  
  
  (1) The State Government may at any time either of its own motion or on an
  
  application made to it in this behalf, call for the records of any case where
  
  an order has been made by the State Board under section 25, section 26 or
  
  section 27 for the purpose of satisfying itself as to the legality or propriety
  
  of any such order and may pass such order in relation thereto as it may think
  
  fit :
  Provided that the State Government shall not
  
  pass any order under this sub-section without affording the State Board and the
  
  person who may be affected by such order a reasonable opportunity of being
  
  heard in the matter.
  (2) The State Government shall not revise any
  
  order made under section 25, section 26 or section 27 where an appeal against
  
  that order lies to the appellate authority, but has not been preferred or where
  
  an appeal has been preferred such appeal is pending before the appellate
  
  authority.