Utah Admin. Code R392-304-18 - Designated Swimming Area Water Quality and Disinfection

(1) The operator shall ensure that the DSA of an artificial swimming lagoon has sufficient clarity to easily see the deepest part of the DSA when the water is static. This may be measured by a Secchi disk or a four-inch by four-inch marker tile.

(2) The operator shall ensure that the DSA of an artificial swimming lagoon is treated by a disinfectant that complies with Subsections R392-302-25(1)(a) through R392-302-25(1)(f), except that:

(a) the minimum concentrations for the DSA treatment chemicals are found in Table 2 in this rule rather than Table 3 in Rule R392-302; and

(b) the maximum concentration for cyanuric acid described in Subsection R392-302-25(1)(f)(ii)(B) is reduced to 50 milligrams per liter.

(3) The operator shall install automated, manual, or remotely managed chemical feed controllers that comply with Subsections R392-302-24(1)(a), R392-302-24(3)(c), and R392-302-24(4)(b).

(4) The operator shall install an ORP controller that complies with Subsection R392-302-24(2) to monitor the oxidizing potential of the water if an oxidizer is used for disinfection.

(5) The operator shall provide a portable poolside water quality test kit that is:

(a) compatible with the disinfectant in use;

(b) maintained in and stored according to the manufacturer's instructions; and

(c) protected from extreme heat and cold, exposure to water, chemicals, or any other element or environment that could adversely affect the efficacy of the test kit.

(6) The operator may use a remote water quality testing system, but may not substitute the remote testing system results for onsite operation and maintenance.

(7)

(a) The operator shall perform testing at a frequency that verifies the DSA is meeting the water quality conditions required in Table 2.

(b) At a minimum, tests for disinfectant levels and pH in each DSA shall be performed before the area is open for bather use and at least every 24 hours of operation.

(8) The operator shall:

(a) collect a water sample from each DSA at least once per month;

(b) submit the 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.

(9) The operator shall review the sample results to determine if the sample 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.

(10)

(a) For any test that does not meet the chemical, bacteriological, or physical parameters described in this section, the operator shall repeat the test within 24 hours of receiving the initial test results.

(b) If the repeat testing shows that the water continues to be outside of the parameters described in this section, the manager shall close any DSA to swimming and contact recreation until additional testing results show that the water quality parameters are within the required range.

TABLE 2 Chemical parameters in each DSA of an ASL
Parameter	Minimum Value	Maximum Value
Free chlorine	0.5 ppm	10.0 ppm
Bromine	2.5 ppm	8.0 ppm
Combined chlorine	None	0.5 ppm
pH	7.0	7.8
Cyanuric acid	None	50 ppm

Notes

Utah Admin. Code R392-304-18

Adopted by Utah State Bulletin Number 2024-18, effective 9/8/2024