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Clean Water Act (CWA)search for term: The act passed by the US Congress to control water pollution. Formally, the Federal Water Pollution Control Act (or Amendments) of 1972 and all subsequent amendments. [(P.L. 92-500), 33 U.S.C. 1251 et. seq., as amended by: P.L. 96-483; P.L. 97-117; P.L. 95-217, 97-117, 97-440, and 100-04.]