R392-302-38. Cryptosporidiosis Watches and Warnings

  (1) The Executive Director or local health officer may issue cryptosporidiosis watches or cryptosporidiosis warnings as methods of intervention for likely or indicated outbreaks of cryptosporidiosis. The Executive Director or local health officer may issue a cryptosporidiosis watch if there is a heightened likelihood of a cryptosporidiosis outbreak. The Executive Director or local health officer may issue a cryptosporidiosis warning if there have been reports of cryptosporidiosis above the background level reported for the disease. The Executive Director or local health officer shall include the geographic area and pool type covered in the warning and may restrict certain persons from using public pools.

  (2) If a cryptosporidiosis watch or a cryptosporidiosis warning has been issued, the operator of any public pool shall post a notice sign meeting at a minimum the ANSI Z535.2-2011 requirements for NOTICE signs with a 10-foot viewing distance and approved by the local health officer. An Adobe Acrobat .pdf version of the sign that meets the requirements of this section shall be made available from the Department or the local health department. The notice sign shall be placed so that all patrons are alerted to the cryptosporidium-targeted requirements prior to deciding whether to use the swimming pool. The sign shall be at least 17 inches, 43 centimeters, wide by 11 inches, 28 centimeters, high.

  (a) Centered immediately below the blue panel shall appear the words "CRYPTO DISEASE PREVENTION" in capital letters.

  (b) The body of the notice sign shall be in upper case letters at least 0.39 inches, 1.0 centimeters, high and include the following four bulleted statements in black letters:

  -All with diarrhea in the past 2 weeks shall not use the pool.

  -All users must shower with soap to remove all fecal material prior to pool entry and after using the toilet or a diaper change.

  -All less than 3 yrs or who wear diapers must wear a swim diaper and waterproof swimwear. Diapers may only be changed in restrooms or changing stations.

  -Keep pool water out of your mouth.

  (3) If a cryptosporidium warning has been issued, each operator of a public pool subject to the warning shall, at a minimum, implement the following cryptosporidium counter measures:

  (a) maintain the disinfectant concentration within the range between two mg/l (four mg/l for bromine) and the concentration listed on the product's Environmental Protection Agency mandated label as the maximum reentry concentration, but in no case more than five mg/l (10 mg/l for bromine);

  (b) maintain the pH between 7.2 and 7.5; and

  (c) maintain the cyanuric acid level that meets the requirement of R392-302-27(3), except the maximum level shall be reduced to 30 mg/l.

  (4)(a) If a cryptosporidium warning has been issued, in addition to the requirements listed in R392-302-38(3), the owner or operator of a public pool shall implement any additional cryptosporidium countermeasures listed in subsection below sufficient to achieve at least a 99.9 percent destruction or removal of cryptosporidium oocysts twice weekly, except as provided in R392-302-38(4)(b).

  (b) Hyperchlorination using sodium hypochlorite or calcium hypochlorite to achieve a concentration multiplied by time (CT) value of 15,300 mg/l minutes. Table 7 lists examples of chlorine concentrations and time periods that may be used to achieve the required CT value. The operator shall not allow anyone to use the pool if the chlorine concentration exceeds the Environmental Protection Agency maximum reentry concentration listed on the product's label, but in no case if the concentration exceeds five mg/l. The operator of any public pool not required to have a lifeguard by R392-302-30(2) shall hyperchlorinate at least once weekly.

  (c) A full flow ultraviolet treatment system that meets the requirements of standard NSF/ANSI 50-2015 for ultraviolet light process equipment. The owner or operator shall ensure that the system is installed and operated according to the manufacturer's recommendations. The owner or operator shall obtain from the manufacturer of the system documentation of third-party challenge testing that the system can achieve a single pass 99.9 percent inactivation of cryptosporidium or the bacteriophage MS2 at the pool design flow rate and during normal operating conditions. The owner or operator shall maintain and make available for inspection the manufacturer's documentation.

  (d) An ozone treatment system that achieves a CT value of 7.4 and a flow-through rate at least four times the volume of the pool every three and a half days. The system shall meet the requirements of standard NSF/ANSI 50-2015 for ozone process equipment. The owner or operator shall ensure that the system is installed and operated according to the manufacturer's recommendations.

  (e) A cryptosporidium oocyst-targeted filter system installed and operated according to the manufacturer's recommendations. The filter shall meet the requirements of R392-302-20. The owner or operator shall obtain from the manufacturer of the system documentation of third-party challenge testing that the system can achieve a single pass 99 percent reduction of particles in the range of 4 to 6 microns or cryptosporidium oocysts at the pool design flow rate and normal operating conditions. The owner or operator shall maintain and make available for inspection the manufacturer's documentation.

  (f) A system approved by the local health officer. The health officer's approval of a system for use as an alternative shall be based on the system's documented ability to:

  (i) achieve cryptosporidium removal or inactivation to a level at least equivalent to the requirements in R392-302-38(4)(a);

  (ii) assure safety for swimmers and pool operators; and

  (iii) comply with all other applicable rules and federal regulations.

TABLE 7

Chlorine Concentration and Contact Time to Achieve CT = 15,300

Chlorine Concentration Contact Time

          1.0 mg/l 15,300 minutes (255 hours)

         10 mg/l 1,530 minutes (25.5 hours)

         20 mg/l 765 minutes (12.75 hours)

  (5) If the Executive Director or local health officer issues a restriction on the use of public pools by certain persons as part of the cryptosporidium warning the operator shall restrict persons within that segment of the population from using the facility.

  (6) If the Executive Director or local health officer determines that a pool is a cryptosporidiosis threat to public health, he may order the pool to close. The owner or operator of the pool may not reopen until the person issuing the order has rescinded it.