BWAs are typically issued when monitoring of water being served to consumers detects E. coli or other microbiological indicators of sewage contamination. Another reason for a BWA is a failure of distribution system integrity evidenced by a loss of system pressure. While loss of pressure does not necessarily mean the water has been contaminated, it does mean that pathogens may be able to enter the piped-water system and thus be carried to consumers.
Some countries, like Canada, have publicly available maps showing the locations of boil water advisories
-Wikipedia
Fort St. John (3)
Boil Water Advisory
Spectra Energy - Sikanni Gas Plant - Water quality advisory - Coliforms present in samples - 5/2/2011
Buckinghorse River Provincial Park - Groundwater possibly under the direct influence of surface water. - 7/1/2009
Spectra Energy - Peggo Gas Plant - No reason given - 7/4/08
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