law: Water (Prevention and Control of Pollution) Act, 1974
  5. Terms and Conditions of Service of Members.
  
  (1) Save as otherwise provided by or under
  
  this Act, a member of a Board, other than a member-secretary, shall hold office
  
  for a term of three years from the date of his nomination :
  Provided that a member shall, notwithstanding
  
  the expiration of his term, continue to hold office until his successor enters
  
  upon his office.
  (2) The terms of office of a member of a Board
  
  nominated under clause (b) or clause (e) of sub-section (2) of section 3 or
  
  clause (b) or clause (e) of sub-section (2) of section 4 shall come to an end
  
  as soon as he ceases to hold the office under the Central Government or the
  
  State Government or, as the case may be, the company or corporation owned,
  
  controlled or managed by the Central Government or the State Government by
  
  virtue of which he was nominated.
  (3) The Central Government or, as the case may 
  
  be, the State Government may, if it thinks fit, remove and member of a Board 
  
  before the expiry of his term of office, after giving him a reasonable 
  
  opportunity of showing cause against the same.
  (4) A member of a Board, other than the member-secretary, may at any time
  
  resign his office by writing under his hand addressed -
  (a) in the case of the
  
  chairman, to the Central Government or as the case may be, the State
  
  Government; and
  (b) in any other case,
  
  to the chairman of the Board, and the seat of the chairman or such other member
  
  shall thereupon become vacant.
  (5) A member of a Board, other than the
  
  member-secretary, shall be deemed to have vacated his seat if he is absent
  
  without reason, sufficient in the opinion of the Board, from three consecutive
  
  meetings of the Board, or where he is nominated under clause (c) or clause (e)
  
  of sub-section (2) of section 3 or under clause (c) or clause
  (e) of sub-section (2) of section 4; if he
  
  ceases to be a member of the State Board or of the local authority or, as the
  
  case may be, of the company or corporation owned, controlled or managed by the
  
  Central Government or the State Government and such vacation of seat shall, in
  
  either case, take effect from such date as the Central Government or, as the
  
  case may be, the State government may, by notification in the Official Gazette,
  
  specify.
  (6) A casual vacancy in a Board shall be
  
  filled by a fresh nomination and the person nominated to fill the vacancy shall
  
  hold office only for the remainder of the term for which the member in whose
  
  place he was nominated.
  (7) A member of a Board shall be eligible for
  
  renomination.
  (8) The other terms and conditions of service
  
  of a member of a Board, other than the chairman and member-secretary, shall be
  
  such as may be prescribed.
  (9) The other terms and conditions of service
  
  of the chairman shall be such as may be prescribed.