1 EXHIBIT 21.1 SUBSIDIARIES OF PIONEER AMERICAS ACQUISITION CORP.: Pioneer Americas, Inc. Pioneer Chlor Alkali Company, Inc. Imperial West Chemical Co. All-Pure Chemical Co. Black Mountain Power Company All-Pure Chemical Northwest, Inc. Pioneer Chlor Alkali International, Inc. G.O.W. Corporation Pioneer (East), Inc. T.C. Holdings, Inc. T.C. Products, Inc.