Utah Admin. Code R392-302-25 – Disinfection and Quality of Water

(1) The manager shall ensure that:
1. (a) each pool is continuously disinfected by a product that:
  1. (i)(A) is certified, listed, and labeled to meet NSF/ANSI/CAN 50 -- 2021 Equipment and Chemicals for Swimming Pools, Spas, Hot Tubs, and Other Recreational Water Facilities;
    1. (B) is certified, listed, and labeled to meet NSF/ANSI 60 -- 2016 Drinking Water Treatment Chemicals -- Health Effects, which is incorporated by reference; or
    2. (C) has an EPA FIFRA registration, as applicable;
  2. (ii) is used in accordance with the manufacturer's instructions;
  3. (iii) imparts a disinfectant residual that may be easily and accurately measured by a field test procedure appropriate to the disinfectant in use;
  4. (iv) is compatible for use with each chemical in use for pool water treatment;
  5. (v) does not create an imminent health hazard for a bather if applied according to manufacturer's specifications; and
  6. (vi) does not create an imminent health hazard if handled, stored, and used according to manufacturer's directions;
2. (b) the concentration of the active disinfectant within the pool water is consistent with:
  1. (i) the manufacturer's directions for the disinfectant in use; and
  2. (ii) the minimum concentration listed in Table 2;
3. (c) the concentration of free available chlorine does not exceed ten mg/L at any time a pool is open to a bather;
4. (d) the concentration of bromine does not exceed ten mg/L at any time a pool is open to a bather; and
5. (e) if the concentration of combined chlorine residual is greater than 0.5 mg/L, the combined chlorine level is reduced by:
  1. (i) breakpoint chlorination; or
  2. (ii) a full or partial exchange of the pool water with potable water.
(2) The manager shall ensure that each product used to treat or condition pool water is used according to the manufacturer's specifications and that the following chemical measurements are maintained:
1. (a) the total alkalinity measurement is within the range of:
  1. (i) 100 to 125 mg/L for a pool lined with plaster;
  2. (ii) 80 to 150 mg/L for a spa pool lined with plaster; and
  3. (iii) 125 to 150 mg/L for a pool lined with another approved construction material;
2. (b) the concentration of cyanuric acid in the water does not exceed 100 mg/L;
3. (c) the TDS does not exceed 1,500 mg/L over the startup total dissolved solid measurement; and
4. (d) a concentration of at least 200 mg/L of calcium hardness.
(3) The manager shall:
1. (a) provide an easy-to-operate, portable disinfectant test kit compatible with pool chemicals and the disinfectant in use, accurate to within 0.5 mg/L at each facility; and
2. (b) ensure that a test kit reagent is not used if the reagent is:
  1. (i) expired;
  2. (ii) adulterated; or
  3. (iii) not stored according to the manufacturer's specifications.
(4) The manager shall ensure that:
1. (a) if cyanuric acid or a stabilized chlorine product is used to stabilize the free chlorine residual from the effects of UV light:
  1. (i) the minimum free available chlorine residual is two mg/L; and
  2. (ii) a test kit for cyanuric acid that is accurate to within 10.0 mg/L is provided; and
2. (b) cyanuric acid or a stabilized chlorine product is not used for any new construction, substantial alteration, or disinfection equipment replacement at:
  1. (i) an indoor pool;
  2. (ii) a spa pool; or
  3. (iii) a therapy pool.
(5) The manager shall ensure that:
1. (a) the pool water has sufficient clarity to easily see the drain grate or cover in the deepest part of the pool, or that a black disk six inches in diameter on a white field is easily visible if placed in the deepest part of the pool;
2. (b) the minimum water temperature for a pool is 78 degrees Fahrenheit; and
3. (c) the maximum water temperature for a pool is 104 degrees Fahrenheit.
(6) The requirements of Subsection (5)(b) do not apply to a cold plunge pool.
TABLE 2Disinfectant Levels and Chemical Parameters Under Normal Operating ConditionsStabilized Chlorine measured in mg/L, see note 2PoolsSpa PoolsSpecial Purpose PoolspH 7.2 to 7.62.0, see note 13.0, see note 12.0, see note 1pH 7.7 to 7.83.0, see note 15.0, see note 13.0, see note 1Non-Stabilized Chlorine measured in mg/L, see note 2pH 7.2 to 7.61.0, see note 12.0, see note 12.0, see note 1pH 7.7 to 7.82.0, see note 13.0, see note 13.0, see note 1Bromine measured in mg/L4.0, see note 14.0, see note 14.0, see note 1pH7.2 to 7.87.2 to 7.87.2 to 7.8Cyanuric acid measured in mg/L0 to 1000 to 1000 to 100Minimum water temperature measured in degrees Fahrenheit see Subsections R392-302-25(5)(b) and R392-302-25(6)787878
Maximum water temperature measured in degrees Fahrenheit see Subsection R392-302-25(5)(c)104104104Calcium Hardness measured in mg/L as calcium carbonate200, see note 1200, see note 1200, see note 1Total Alkalinity measured in mg/LPlaster pools100 to 12580 to 150100 to 125Painted or Fiberglass pools125 to 15080 to 150125 to 150Saturation Index see Table 3-0.3 to +0.3-0.3 to +0.3-0.3 to +0.3Chloramines or combined chlorine residual measured in mg/L0.5, see note 30.5, see note 30.5, see note 3Note 1: Minimum valueNote 2: Maximum value of free chlorine is ten mg/L as described in Subsection R392-302-25(1)(c)Note 3: Maximum value of chloramines or combined chlorine residual as described in Subsection R392-302- 25(1)(g)
(7) The manager shall ensure that:
1. (a) the saturation index is calculated and recorded monthly in accordance with Table 3; and
2. (b) the saturation index value of the pool water is within the range of -0.3 and +0.3.
  TABLE 3Chemical Values and Formula for Calculating Saturation IndexThe formula for calculating the saturation index is:SI = pH + TF + CF + AF -- TDSFSI means Saturation IndexTF means temperature factorCF means calcium factordeg F means degrees FahrenheitAF means alkalinity factorTDSF means total dissolved solids factorTemperature in deg FTFCalcium Hardness in mg/LCFTotal Alkalinity in mg/LAF320.0251.0251.4370.1501.3501.7460.2751.5751.9530.31001.61002.0600.41251.71252.1660.51501.81502.2760.62001.92002.3840.72502.02502.4940.83002.13002.51050.94002.24002.61281.08002.58002.9Total Dissolved Solids in mg/LTDSF0 to 99912.11000 to 199912.22000 to 299912.33000 to 399912.44000 to 499912.55000 to 599912.556000 to 699912.67000 to 799912.65Each additional 1000Add 0.05If the SATURATION INDEX is 0, the water is chemically in balance.If the INDEX is a minus value, corrosive tendencies are indicated. If the INDEX is a positive value, scale forming tendencies are indicated.EXAMPLE: Assume the following factors:pH 7.5; temperature 80 degrees F; calcium hardness 235; total alkalinity 100; and total dissolved solids 999.pH = 7.5TF = 0.7CF = 1.9AF = 2.0TDSF = 12.1
  TOTAL: 7.5 + 0.7 + 1.9 + 2.0 - 12.1 = 0.0This water is chemically balanced.
(8) The local health officer shall ensure:
1. (a) a pool water sample is collected from each pool at least once per month or at a more frequent interval as determined by the local health officer;
2. (b) the collected pool water sample is submitted to a laboratory approved under Rule R444-14 to perform total coliform and heterotrophic plate count testing; and
3. (c) the collected sample is analyzed in a laboratory for total coliform and heterotrophic plate count using methods allowed under Section R444-14-4.
(9) An individual who submits the collected sample to the analyzing laboratory shall ensure that the laboratory provides sample results within five working days to the local health department and the manager.
(10) The local health officer shall review the sample results to determine if the pool water has failed the bacteriological quality standard as determined by the following sample failure criteria:
1. (a) the sample contains more than 200 colony-forming units (CFUs) per milliliter, as determined by the heterotrophic plate count; or
2. (b) the sample indicates the presence of coliform bacteria or contains more than one CFU of coliform bacteria per 100 milliliters.
(11) If the local health officer determines that the sample fails as described in Subsection (10), an additional sample shall be collected and submitted as described in Subsection (8) not more than three laboratory receiving days after the sample report was received.
(12) Pool sampling, as described in Subsection (8), is not required if:
1. (a) the pool is closed; or
2. (b) the pool is temporarily closed for a continuous interval exceeding half a calendar month.
(13)(a) If any pool water sample required in Subsection (8) fails bacteriological quality standards as described in Subsection (10), the manager shall develop a corrective action plan.
1. (b) The local health officer may require the manager to submit a written corrective action plan.
(14) If more than one of three consecutive pool water samples required in Subsection (8) fail bacteriological quality standards as described in Subsection (10), the local health officer may require:
1. (a) more frequent water bacteriological sample collection;
2. (b) a health inspection;
3. (c) additional training for the qualified pool operator;
4. (d) more frequent water quality monitoring, including checking and recording:
  1. (i) disinfectant residuals, pH, and pool water temperature up to four times a day; and
  2. (ii) flow rate gauges and pool circulation rates up to four times a day;
5. (e) installation of automated controller technology, such as an ORP, as described in Subsection R392-302-24(2); or
6. (f) a written plan or conference with the local health department.

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