Section R392-302-25 - Disinfection and Quality of Water(1) The manager shall ensure that: (a) each pool is continuously disinfected by a product that: (i) is registered with the United States Environmental Protection Agency as a disinfecting process or disinfectant product for pool water;(ii) imparts a disinfectant residual that may be easily and accurately measured by a field test procedure appropriate to the disinfectant in use;(iii) is compatible for use with other chemicals normally used in pool water treatment;(iv) does not create an imminent health hazard for bathers if applied according to manufacturer's specifications; and(v) does not create an imminent health hazard if handled, stored, and used according to manufacturer's directions;(b) the concentration of the active disinfectant within the pool water is consistent with: (i) the manufacturer's directions for the disinfectant in use; and(ii) the minimum concentration listed in Table 3;(c) the concentration of free available chlorine is not above ten milligrams per liter while the facility is open to bathers;(d) products used to treat or condition pool water are used according to the manufacturer's directions;(e) expired test kit reagents are not used; and(f) if cyanuric acid or stabilized chlorine is used to stabilize the free chlorine residual from the effects of UV light:(i) a test kit for cyanuric acid accurate to within 10.0 milligrams per liter is provided; and(ii) the concentration of cyanuric acid in the water is: (A) at least ten milligrams per liter; and(B) does not exceed 100 milligrams per liter;(g) if the concentration of combined chlorine residual is greater than 0.5 milligrams per liter the combined chlorine level is reduced by:(i) breakpoint chlorination, as described in Subsection (15); or(ii) a full or partial exchange of the pool water with potable water; and(h) the total alkalinity measurement is within the range of:(i) 100 to 125 milligrams per liter for a pool lined with plaster;(ii) 80 to 150 milligrams per liter for a spa pool lined with plaster; and(iii) 125 to 150 milligrams per liter for a pool lined with other approved construction materials.(2) The manager shall provide an easy to operate, portable disinfectant test kit compatible with the disinfectant in use and accurate to within 0.5 milligrams per liter at each facility.(3) The manager shall calculate the saturation index in accordance with Table 2 and ensure that the saturation index value of the pool water is within the range of -0.3 and +0.3.(4) The manager shall ensure that: (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;(b) the minimum water temperature for a pool is 78 degrees Fahrenheit; and(c) the maximum water temperature for a pool is 104 degrees Fahrenheit.(5) The local health officer may grant an exemption to the pool water temperature requirements for a special purpose pool including a cold plunge pool but may not exempt the water temperature requirement listed in Subsection (4)(c).(6) The manager or a representative of the local health department, as determined by the local health officer, shall: (a) collect a pool water sample from each pool at least once per month or at a more frequent interval as determined by the local health officer;(b) submit the collected pool water sample to a laboratory approved under Rule R444-14, Certification of Environmental Laboratories, to perform total coliform and heterotrophic plate count testing; and(c) ensure that the collected sample is analyzed in a laboratory for total coliform and heterotrophic plate count using methods allowed under Section R444-14-4.(7) The 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.(8) The local health officer and manager 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:(a) the sample contains more than 200 colony forming units (CFUs) per milliliter, as determined by the heterotrophic plate count; or(b) the sample indicates the presence of coliform bacteria or contains more than one CFU of coliform bacteria per 100 milliliters.(9) If the local health officer determines that the sample fails as described in Subsection (8), an additional sample shall be collected and submitted as described in Subsection (6) within one laboratory receiving day after the sample report was received.(10) A local health officer may exempt a pool from the requirement of monthly sampling if:(a) the pool is closed, whether permanently or seasonally; or(b) the pool is temporarily closed for an interval exceeding half of a calendar month.(11) If the pool water samples required in Subsection (6) fail bacteriological quality standards as described in Subsection (8), the manager shall develop a corrective action plan and submit the plan to the local health department for approval.(12) If a more than one of five pool water samples required in Subsection (6) fail bacteriological quality standards as described in Subsection (8), the local health officer may require any of the following:(a) more frequent water bacteriological sample collection;(c) additional training for the pool operator; or(d) more frequent water quality monitoring including: (i) disinfectant residuals, pH, and pool water temperature are checked and recorded four times a day; and(ii) flow rate gauges and pool circulation rates are checked and recorded four times a day.(13) If ORP technology is used in accordance with Subsection R392-302-24(2), the local health officer may reduce the water quality monitoring frequency described in Subsection (12)(d)(i).(14) The local health officer may limit peak bather load as described in Section R392-302-26, to ensure proper pool water quality.(15) The manager shall calculate the dose of additional free available chlorine to add to the pool to achieve breakpoint chlorination as follows: (a) find the amount of combined chlorine in the pool by: (i) testing the pool water for free available chlorine and total chlorine and subtracting the free available chlorine from the total chlorine; or(ii) testing the pool water for combined chlorine;(b) multiplying the combined chlorine level by ten to find the amount of free available chlorine to add to the water to achieve breakpoint chlorination. TABLE 2 CHEMICAL VALUES AND FORMULA FOR CALCULATING SATURATION INDEX The formula for calculating the saturation index is: SI = pH + TF + CF + AF -- TDSF SI means Saturation Index TF means temperature factor CF means calcium factor mg/l means milligrams per liter deg F means degrees Fahrenheit AF means alkalinity factor TDSF means total dissolved solids factor |
Temperature in deg F | TF | Calcium Hardness in mg/l | CF | Total Alkalinity in mg/l | AF |
32 | 0.0 | 25 | 1.0 | 25 | 1.4 |
37 | 0.1 | 50 | 1.3 | 50 | 1.7 |
46 | 0.2 | 75 | 1.5 | 75 | 1.9 |
52 | 0.3 | 100 | 1.6 | 100 | 2.0 |
I | 0.4 | 125 | 1.7 | 125 | 2.1 |
66 | 0.5 | 150 | 1.8 | 150 | 2.2 |
76 | 0.6 | 200 | 1.9 | 200 | 2.3 |
84 | 0.7 | 250 | 2.0 | 250 | 2.4 |
94 | 0.8 | 300 | 2.1 | 300 | 2.5 |
105 | 0.9 | 400 | 2.2 | 400 | 2.6 |
128 | 1.0 | 800 | 2.5 | 800 | 2.9 |
Total Dissolved Solids in mg/l | TDSF |
0 to 999 | 12.1 |
1000 to 1999 | 12.2 |
2000 to 2999 | 12.3 |
3000 to 3999 | 12.4 |
4000 to 4999 | 12.5 |
5000 to 5999 | 12.55 |
6000 to 6999 | 12.6 |
7000 to 7999 | 12.65 |
Each additional 1000 | Add 0.05 |
If 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, 19 degrees C; calcium hardness 235; total alkalinity 100; and total dissolved solids 999. pH = 7.5 TF = 0.7 CF = 1.9 AF = 2.0 TDSF = 12.1 TOTAL: 7.5 + 0.7 + 1.9 + 2.0 - 12.1 = 0.0 This water is chemically balanced. |
TABLE 3 DISINFECTANT LEVELS AND CHEMICAL PARAMETERS UNDER NORMAL OPERATING CONDITIONS |
Stabilized Chlorine measured in milligrams per liter see note 2 | POOLS | SPA POOLS | SPECIAL PURPOSE POOLS |
pH 7.2 to 7.6 | 2.0, see note 1 | 3.0, see note 1 | 2.0, see note 1 |
pH 7.7 to 8.0 | 3.0, see note 1 | 5.0, see note 1 | 3.0, see note 1 |
Non-Stabilized Chlorine measured in milligrams per liter see note 2 | | | |
pH 7.2 to 7.6 | 1.0, see note 1 | 2.0, see note 1 | 2.0, see note 1 |
pH 7.7 to 8.0 | 2.0, see note 1 | 3.0, see note 1 | 3.0, see note 1 |
Bromine measured in milligrams per liter | 4.0, see note 1 | 4.0, see note 1 | 4.0, see note 1 |
Iodine measured in milligrams per liter | 1.0, see note 1 | 1.0, see note 1 | 1.0, see note 1 |
pH | 7.2 to 7.8 | 7.2 to 7.8 | 7.2 to 7.8 |
Cyanuric acid measured in milligrams per liter | 10 to 100 | 10 to 100 | 10 to 100 |
Minimum water temperature measured in degrees Fahrenheit see Subsections R392-302-25(4)(b) and R392-302-25(5) | 78 | 78 | 78 |
Maximum water temperature measured in degrees Fahrenheit see Subsections R392-302-25(4)(c) and R392-302-25(5) | 104 | 104 | 104 |
Calcium Hardness measured in milligrams per liter as calcium carbonate | 200, see note 1 | 200, see note 1 | 200, see note 1 |
Total Alkalinity Measured in milligrams per liter | | | |
Plaster pools | 100 to 125 | 80 to 150 | 100 to 125 |
Painted or Fiberglass pools | 125 to 150 | 80 to 150 | 125 to 150 |
Saturation Index see Table 2 | -0.3 to +0.3 | -0.3 to +0.3 | -0.3 to +0.3 |
Chloramines or combined chlorine residual measured in milligrams per liter | 0.5, see note 3 | 0.5, see note 3 | 0.5, see note 3 |
Note 1: Minimum value Note 2: Maximum value of free chlorine is ten milligrams per liter 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) |
Utah Admin. Code R392-302-25
Amended by Utah State Bulletin Number 2017-12, effective 6/1/2017Amended by Utah State Bulletin Number 2018-12, effective 5/24/2018Amended by Utah State Bulletin Number 2020-05, effective 2/26/2020Amended by Utah State Bulletin Number 2020-16, effective 8/10/2020Adopted by Utah State Bulletin Number 2023-17, effective 8/21/2023