law: Water (Prevention and Control of Pollution) Act, 1974
  2. Definitions.
  
  
  In this Act, unless the context otherwise requires.-
  (a) "Board" means the Central Board
  
  or a State Board;
  (b) "Central Board" means the
  
  Central Pollution Control Board constituted under section 3;
  (c) "member" means a member of a
  
  Board and includes the chairman thereof;
  (d) "occupier", in relation to any
  
  factory or premises, means the person who has control over the affairs of the
  
  factory or the premises, and includes, in relation to any substance, the person
  
  in possession of the substance;
  (dd) "outlet" includes any conduit
  
  pipe or channel, open or closed, carrying sewage or trade effluent or any other
  
  holding arrangement which causes, or is likely to cause, pollution;
  (e) "pollution" means such
  
  contamination of water or such alteration of the physical, chemical or
  
  biological properties of water or such discharge of any sewage or trade
  
  effluent or of any other liquid, gaseous or solid substance into water (whether
  
  directly or indirectly) as may or is likely to, create a nuisance or render
  
  such water harmful or injurious to public health or safety, or to domestic,
  
  commercial, industrial, agricultural or other legitimate uses, or to the life
  
  and health of animals or plants or of aquatic organisms;
  (f) "prescribed" means prescribed by
  
  rules made under this Act by the Central Government or, as the case may be, the
  
  State Government;
  (g) "sewage effluent" means effluent
  
  from any sewerage system or sewage disposal works and includes sullage from
  
  open drains;
  (gg) "sewer" means any conduit pipe
  
  or channel, open or closed, carrying sewage or trade effluent;
  (h) "State Board" means a State
  
  Pollution Control Board constituted under section 4;
  (i) "State Government" in relation to a Union territory means the
  
  Administrator thereof appointed under Article 239 of the Constitution;
  (j) "stream" includes -
  (i) river;
  (ii) water course
  
  (whether flowing or for the time being dry);
  (iii) inland water
  
  (whether natural or artificial);
  (iv) sub-terranean
  
  waters;
  (v) sea or tidal
  
  waters to such extent or, as the case may be, to such point as the State
  
  Government may, by notification in the Official Gazette, specify in this
  
  behalf;
  (k) "trade effluent" includes any
  
  liquid, gaseous or solid substance which is discharged from any premises used
  
  for carrying on any industry; operation or process or treatment and disposal
  
  system other than domestic sewage.