| 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, 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
|