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Boil Water Advisory Fact Sheet

Government Services Region Codes Code
St. John's SJ
Eastern (Clarenville) E
Central (Gander) GAN
Western W
Labrador L

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Standard Reasons for Issuing Boil Water Advisories
Water supply has no disinfection system A
Chlorination system is turned off by the operator, due to taste or other aesthetic considerations. B1
Chlorination system is turned off by operator, due to perceived health risks. B2
Chlorination system is turned off by operator, due to lack of funds to operate. B3
Disinfection system is off due to maintenance or mechanical failure. C1
Disinfection system is off due to lack of chlorine or other disinfectant. C2
Water distribution system is undergoing maintenance or repairs. D1
A cross connection is discovered in the distribution system. D2
Inadequately treated water was introduced into the system due to fireflows, flushing operations, interconnections, minor power outage or other pressure loss. D3
Water entering the distribution system or facility, after a minimum 20 minute contact time does not have a free chlorine residual of at least 0.3 mg/l or equivalent CT value. E1
No free chlorine residual detected in the water distribution system. E2
Insufficient residual disinfectant in water system primarily disinfected by means other than chlorination. E3
Total coliform detected AND repeat samples can not be taken as required F2T
Escherichia coli (E. coli) detected AND repeat samples can not be taken as required F2E
Total coliforms detected and confirmed in repeat sample. F3
Escherichia coli (E.coli) detected in an initial sample(s) is considered extensive and the water system has other known problems. F4
Escherichia coli (E.coli) detected and confirmed in repeat sample. F5
Viruses detected (eg, Hepatitis A, Norwalk). F6
Protozoa detected (eg, Giardia, Cryptosporidium). F7
Water supply system integrity compromised due to disaster (e.g. contamination of water source from flooding, gross contamination, major power failure, etc.). G
Waterborne disease outbreak in the community. H
 
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