Canadian Water Treatment Companies.

BC Drinking Water Protection Act & Drinking Water Protection Regulation
[includes amendments up to B.C. Reg. 87/2011, May 19, 2011]

http://www.bclaws.ca/EPLibraries/bclaws_new/document/ID/freeside/10_200_2003
http://www.health.gov.bc.ca/protect/dwregulations.html