1 EXHIBIT 21.1 SUBSIDIARIES OF PIONEER AMERICAS ACQUISITION CORP. State of Jurisdiction Name or Incorporation ---- --------------------- PCI Chemicals Canada Inc. New Brunswick Pioneer Americas, Inc. Delaware Pioneer Chlor Alkali Company, Inc. Delaware Imperial West Chemical Co. Nevada All-Pure Chemical Co. California Black Mountain Power Company Texas All-Pure Chemical Northwest, Inc. Washington Pioneer Chlor Alkali International, Inc. Barbados G.O.W. Corporation Nevada Pioneer (East), Inc. Delaware T.C. Holdings, Inc. New Mexico T.C. Products, Inc. Washington PCI Carolina, Inc. Delaware Pioneer Licensing, Inc. Delaware