1. (1) The local health officer may issue a cryptosporidiosis outbreak watch or warning in coordination with the department:

   1. (a) as a method of intervention for a likely or indicated outbreak of cryptosporidiosis;
   2. (b) if there is a heightened likelihood of a cryptosporidiosis outbreak; or
   3. (c) if there have been reports of cryptosporidiosis above the background level reported for the disease.

2. (2) For any issued cryptosporidiosis outbreak watch or warning, the local health officer, in coordination with the department, shall include:

   1. (a) the geographic area of the cryptosporidiosis outbreak watch or warning;
   2. (b) each pool type affected by the cryptosporidiosis outbreak watch or warning; and
   3. (c) any persons restricted from public pool use.

3. (3)(a) If a cryptosporidiosis outbreak watch or warning has been issued, a manager shall post a notice sign.

   1. (b) The manager shall ensure the notice sign states:

      1. (i) "Any bather with diarrhea in the past two weeks may not use the pool";
      2. (ii) "Each bather shall shower with soap before pool entry and after using the toilet";
      3. (iii) "Any bather wearing a diaper or any bather younger than three years old shall wear a water-resistant swim diaper and waterproof swimwear";
      4. (iv) "Diapers shall only be changed in restrooms or changing stations"; and
      5. (v) "Bathers shall avoid taking pool water into their mouth."
   2. (c) 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.

4. (4) If a cryptosporidium outbreak watch has been issued, each manager of a pool subject to the watch shall maintain the following pool water chemistry balance measures:

   1. (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;
   2. (b) pH is between 7.2 and 7.5; and
   3. (c) the cyanuric acid level meets the requirement of Subsection R392-302-25(2)(b), except the maximum level shall be reduced to 30 ppm.

5. (5) If a cryptosporidium outbreak warning has been issued, in addition to the requirements listed in Subsection (4), the manager shall implement any of the following cryptosporidium countermeasures:

   1. (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;
   2. (b) a full-flow ultraviolet treatment system that meets the requirements of standard NSF/ANSI/CAN 50 -- 2021 Equipment and Chemicals for Swimming Pools, Spas, Hot Tubs, and Other Recreational Water Facilities, for ultraviolet light process equipment;
   3. (c) an ozone treatment system installed and operated according to the manufacturer's recommendations that meets the requirements of the NSF/ANSI/CAN 50 -- 2021 Equipment and Chemicals for Swimming Pools, Spas, Hot Tubs, and Other Recreational Water Facilities, for ozone process equipment, and a flow-through rate at least four times the volume of the pool every three and a half days;
   4. (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
   5. (e) another engineered or operational cryptosporidium countermeasure approved by the local health officer.

6. (6) The manager shall ensure that the cryptosporidium countermeasure selected from Subsections (5)(b) through (5)(e) has manufacturer's documentation available for inspection at the request of the local health officer and is:

   1. (a) installed and operated according to the manufacturer's recommendations;
   2. (b) able to achieve a 99.9% inactivation of cryptosporidium oocysts at pool design flow rate and normal operating conditions; and
   3. (c) operated to ensure the safety of each swimmer and pool operator.

7. (7)(a) If a pool continues to pose a cryptosporidium outbreak threat to the public after cryptosporidium countermeasures as described in Subsections (4) through (6) have been implemented, the local health officer shall order the pool to close.

   1. (b) The manager may not reopen the pool until the local health officer has rescinded the pool closure order.

      TABLE 7Chlorine Concentration and Contact Time to Achieve CT for CryptosporidiumChlorine Concentration Contact Time 1.0 mg/L15,300 minutes or 255 hours10 mg/L1,530 minutes or 25.5 hours 20 mg/L765 minutes or 12.75 hours

KEY: pools, spas, swimming, water

Date of Last Change: May 26, 2026

Notice of Continuation: October 21, 2021

Authorizing, and Implemented or Interpreted Law: 26B-1-202; 26B-7-113; 26B-7-124; 26B-7-402