Current through Bulletin 2024-06, March 15, 2024
(1) The local health officer may issue a
cryptosporidiosis outbreak watch or warning in coordination with the
department:
(a) as a method of intervention
for a likely or indicated outbreak of cryptosporidiosis;
(b) if there is a heightened likelihood of a
cryptosporidiosis outbreak; or
(c)
if there have been reports of cryptosporidiosis above the background level
reported for the disease.
(2) For any issued cryptosporidiosis outbreak
watch or warning, the local health officer, in coordination with the
department, shall include:
(a) the geographic
area of the cryptosporidiosis outbreak watch or warning;
(b) each pool type affected by the
cryptosporidiosis outbreak watch or warning; and
(c) and any persons restricted from public
pool use.
(3) If a
cryptosporidiosis outbreak watch or warning has been issued, the manager shall
post a notice sign meeting the two-inch safety sign as described in Subsection
R392-302-32(1)
that includes a "warning" heading.
(4) The local health department or the
department shall provide a digital or printed copy of a sign that meets the
requirements of Subsection (3) to the manager upon request.
(5) The manager shall ensure that the notice
sign:
(a) is at least 17 inches wide by 11
inches in length;
(b) has the words
"Crypto Disease Prevention" written in capital letters and centered immediately
below the heading as required in Subsection
R392-302-32(1);
(c) includes the following bulleted
statements written in capital black letters at least 0.39 inches high:
(i) "Any bather with diarrhea in the past two
weeks may not use the pool";
(ii)
"Each bather shall shower with soap before pool entry and after using the
toilet";
(iii) "Any bather wearing
a diaper or any bather younger than three years old shall wear a
water-resistant swim diaper and waterproof swimwear";
(iv) "Diapers shall only be changed in
restrooms or changing stations"; and
(v) "Bathers shall avoid taking pool water
into their mouth".
(6) If a cryptosporidium outbreak warning has
been issued, each manager of a pool subject to the warning shall maintain the
following pool water chemistry balance measures:
(a) disinfectant concentration is within the
range of 2.0 ppm to 10.0 ppm for chlorine, or 4.0 ppm to 10.0 ppm for
bromine;
(b) pH is between 7.2 and
7.5; and
(c) the cyanuric acid
level meets the requirement of Subsection
R392-302-25(1)(f),
except the maximum level shall be reduced to 30 ppm.
(7) If a cryptosporidium outbreak warning has
been issued, in addition to the requirements listed in Subsection (6), the
manager shall implement any of the following cryptosporidium countermeasures:
(a) Hyperchlorination using a non-stabilized
chlorine product such as sodium hypochlorite or calcium hypochlorite at least
twice weekly to achieve a free chlorine residual concentration multiplied by a
time value of 15,300 mg/L minutes as found in Table 7;
(b) a full flow ultraviolet treatment system
that meets the requirements of standard NSF/ANSI 50-2015, which is incorporated
by reference, for ultraviolet light process equipment;
(c) an ozone treatment system installed and
operated according to the manufacturer's recommendations that meets the
requirements of the NSF/ANSI 50-2015 standard for ozone process equipment,
which is incorporated by reference, and a flow-through rate at least four times
the volume of the pool every three and a half days;
(d) a cryptosporidium oocyst-targeted filter
system installed and operated according to the manufacturer's recommendations
in addition to any installed filtration system as required in Section
R392-302-23; or
(e) another engineered or operational
cryptosporidium countermeasure approved by the local health
officer.
(8) The manager
shall ensure that the cryptosporidium countermeasure selected from Subsections
(7)(b) through (7)(e) has manufacturer's documentation available for inspection
at the request of the local health officer and is:
(a) installed and operated according to the
manufacturer's recommendations;
(b)
able to achieve a 99.9% inactivation of cryptosporidium oocysts at pool design
flow rate and normal operating conditions; and
(c) operated to assure safety for swimmers
and pool operators.
(9)
(a) If a pool continues to pose a
cryptosporidium outbreak threat to the public after cryptosporidium
countermeasures as described in Subsections (6) through (8) have been
implemented, the local health officer shall order the pool to close.
(b) The manager may not reopen the pool until
the local health officer has rescinded the pool closure order.
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TABLE 7
Chlorine Concentration and Contact
time to achieve CT for Cryptosporidium
|
|
Chlorine Concentration
|
Contact Time
|
|
1.0 mg/l
|
15,300 minutes or 255 hours
|
|
10 mg/l
|
1,530 minutes or 25.5 hours
|
|
20 mg/l
|
765 minutes or 12.75 hours
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