Utah Administrative Code
Topic - Health
Title R392 - Population Health, Environmental Health
Rule R392-302 - Design, Construction and Operation of Public Pools
Section R392-302-25 - Disinfection and Quality of Water
Current through Bulletin 2023-24, December 15, 2023
(1) The manager shall ensure that:
(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:
(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:
(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:
(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:
(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:
(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:
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 |
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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 |
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0 to 999 |
12.1 |
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1000 to 1999 |
12.2 |
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2000 to 2999 |
12.3 |
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3000 to 3999 |
12.4 |
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4000 to 4999 |
12.5 |
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5000 to 5999 |
12.55 |
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6000 to 6999 |
12.6 |
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7000 to 7999 |
12.65 |
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Each additional 1000 |
Add 0.05 |
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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 |
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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 |
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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 |
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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) |
Amended by Utah State Bulletin Number 2017-12, effective 6/1/2017
Amended by Utah State Bulletin Number 2018-12, effective 5/24/2018
Amended by Utah State Bulletin Number 2020-05, effective 2/26/2020
Amended by Utah State Bulletin Number 2020-16, effective 8/10/2020
Adopted by Utah State Bulletin Number 2023-17, effective 8/21/2023