American Water Works Research Foundation (AWWARF)

• www.awwarf.com/newprojects/perctbl.html

• www/awwarf/com/newprojects.perchlor.htm

US Environmental Protection Agency (US EPA)

• www.epa.gov/ogwdw000/ccl/perchlor/perchloro.htm

• www.epa.gov/ogwdw000/ipsc.htm

• www.epa.gov/safewater/ccl/perchlor/ipsc.html