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A PBWN should be issued as required or recommended in the Department
of Health's "Guidelines for the Issuance of Precautionary Boil Water
Notices" as adopted in
Rule 62-555.335, F.A.C.
When confirmatory samples indicate the presence of fecal, E.
coli, or other waterborne pathogens:
A Precautionary Boil Water Notice must be issued as soon as
possible, but no later than 24 hours after the system learns of
DEP and the local County Health Department (CHD) must be
contacted no later than the end of the day the system learns of
result (FAC 62-550.518(10)).
To rescind the notice, three repeat samples (1 from the original
location, 1 each from five connections upstream and downstream)
must all be clear of total coliform, fecal and E.coli bacteria,
and an adequate chlorine residual (>0.2mg/L) must be
Depending on the number of confirmatory samples indicating the
presence of fecal, E. coli, or other waterborne pathogens,
public notice may be required in
accordance with Rule
62-560.410, Florida Administrative Code.
When the system has zero or negative pressure:
Total pressure loss should always result in a PBWN.
Suppliers of water may also contact the
State Warning Point (SWP)
at 800-320-0519 if the entire
system has been affected or if sabotage is suspected.
Two consecutive days of bacteriological samples, representative
of the affected areas, must be collected before the notice can
When the system has low water pressure:
Pressures <20 psi (but greater than zero) may not always require
Use professional judgment (what types of facilities were
affected, for how long, and what's the possibility of
Even if a PBWN is not issued, two days of bacteriological
samples should be collected (representative of the area
affected) and adequate pressure should be restored as soon as
Water main breaks:
If the break can be isolated by valves, resulting in areas of
zero pressure, a PBWN should be issued for those customers in
the affected area.
After main break repairs:
Main shall be disinfected in accordance with
standards. Visit the
American Water Works Association (AWWA) website to obtain the AWWA
Restore adequate disinfectant residual (≥0.2mg/L - 4.0mg/L).
Collect two consecutive days of bacteriological samples upstream and
downstream of the water break location.
Flooding of wells:
When a PBWN is issued, a rolling boil for a period of one minute is
sufficient to render water used for drinking, cooking, making ice,
brushing teeth, or washing dishes microbiologically safe, free of
bacteria, viruses, and protozoa.
Tap water can be disinfected by
adding 8 drops of unscented household bleach (4 - 6 % active
ingredients) to each gallon of water, then mixing the water and
allowing it to stand for a minimum period of 30 minutes.
Cloudy water requires 16 drops of bleach and a 30 minute contact
time. Also, other approved chemical disinfectants are available at
stores that sell camping and hiking supplies.
Boil Water Notice
Guidelines for Florida's Food Industry- issued June 1, 2011
by the Florida Departments of Agriculture and Consumer Services,
Business and Professional Regulation and Health [.pdf
Notices can be rescinded when satisfactory bacteriological samples
are obtained, and DEP and County Public Health Units have been notified.
The authority issuing the PBWN shall also be responsible for its
Recission Templates. Templates are in Word format.
Drinking Water Section
3319 Maguire Blvd.,
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