Chapter ATCP 76

ATCP 76.14(5)(e)2.c. c. Range of volume of fresh source water added to pool each day.

ATCP 76.14(5)(e)2.d. d. Description of showering requirements and how communicated to patrons.

ATCP 76.14(5)(e)2.e. e. A record shall be maintained documenting combined chlorine test results, date and times breakpoint chlorination was performed, and any complaints of eye or respiratory irritation.

ATCP 76.14(5)(f) (f) Maximum chlorine residual. The maximum chlorine residual in any pool may not exceed 10 ppm. P

ATCP 76.14(5)(g) (g) Maximum total bromine. The maximum total bromine in a pool may not exceed 10 ppm. P

s. ATCP 76.14 Table A
Minimum disinfectant or sanitizer residuals
in parts per million (ppm)

ATCP 76.14(6) (6) Electronic monitoring devices.

ATCP 76.14(6)(a) (a) Water potential. When oxidation potential controllers are used the water potential shall be kept between 650-900 mV. In addition to the requirements pursuant to s. ATCP 76.18 (3), if the water potential reads below 650 mV or above 900 mV, the operator shall manually test the pool water with an approved test kit. Pf

ATCP 76.14(6)(b) (b) Free chlorine, or bromine. For a pool equipped with an approved and properly maintained electronic monitoring device to control the disinfectant or sanitizer level and pH, the available disinfectant or sanitizer residual shall meet the minimum requirements pursuant to s. ATCP 76.14 Table A, and be tested pursuant to s. ATCP 76.18 (3). Pf

ATCP 76.14 History History: CR 22-021: cr. Register June 2023 No. 810, eff. 9-24-23.

ATCP 76.15 ATCP 76.15 Alternative or supplemental disinfection systems. Any one of the following alternative or supplemental systems may be added to a pool if an automated disinfection system is in place and on line to maintain the disinfectant or sanitizer residuals pursuant to s. ATCP 76.14 Table A. Pf

ATCP 76.15(1) (1) Chlorine generators.

ATCP 76.15(1)(a) (a) NSF 50. Chlorine generators, including salt systems, shall be certified and installed to NSF 50 and manufacturer instructions. Pf

ATCP 76.15(1)(b) (b) Disinfectant system on line. An additional disinfection system shall remain on line and able to automatically provide the capacity to superchlorinate the water and maintain the required sanitizer residual. P

ATCP 76.15(2) (2) Ozone generators.

ATCP 76.15(2)(a) (a) Maximum concentration. Ozone generators shall provide a concentration of ozone in the return line to the pool not to exceed 0.1 mg/L. P

ATCP 76.15(2)(b) (b) Electrically interlocked. The ozone generator shall be electrically interlocked with the recirculation pump to prevent the feeding of ozone when the recirculation pump is not operating. A flow sensor controller may also be used to turn off the feeder when flow is interrupted. P

ATCP 76.15(2)(c) (c) Maximum ambient ozone level. Off-gassing of ozone may not result in ozone levels in the equipment room or pool area exceeding 0.1 ppm. P

ATCP 76.15(3) (3) Ultraviolet light. Ultraviolet light units shall be certified to NSF 50, and tested and approved for use in water disinfection systems and installed pursuant to NSF 50 requirements. P

ATCP 76.15(4) (4) Other technologies. Other technologies that inactivate or kill pathogens shall be certified and installed pursuant to NSF 50, manufacturer instructions, and have an EPA registration number, if applicable. P

ATCP 76.15 History History: CR 22-021: cr. Register June 2023 No. 810, eff. 9-24-23.

ATCP 76.16 ATCP 76.16 Water quality.

ATCP 76.16(1) (1) General requirement. Pool water shall be free of chemical, physical, and microbial substances known to be, or suspected of being, capable of creating toxic reactions or skin or membrane irritations. P

ATCP 76.16(2) (2) Water clarity. Pool water shall be transparent and free from cloudiness. The main drain grating shall be readily visible from the pool deck, including the outline of the main drain and the main drain cover pattern. P

ATCP 76.16(3) (3) Water sampling.

ATCP 76.16(3)(a) (a) Sample collection and analysis. The department or its agent may collect samples of pool water for microbiological analysis in evaluating water quality. The analysis of water samples shall be performed by a laboratory accredited by the department. These monitoring activities may be supplemented with additional microbiological analysis, which shall be performed by an accredited laboratory certified in those methods.Pf

ATCP 76.16 Note Note: A list of accredited laboratories may be obtained by calling the department at [phone] or by email at www.datcp.state.wi.us.

ATCP 76.16(3)(b) (b) Bacteriological standards. Water quality shall be maintained to meet the following standards:

ATCP 76.16(3)(b)1. 1. When bacteriological analysis of total coliforms, Staphylococcus aureus, Pseudomonas aeruginosa or Legionella pneumophila is performed, no detectable levels are present in a 100 milliliter sample. P Any approved method for each analyte may be reported as either colony forming units or most probable number.

ATCP 76.16(3)(b)2. 2. When bacteriological analysis is performed for the heterotrophic plate count, the total count may not exceed 200 colony forming units per milliliter (CFU/mL) in a 100 milliliter sample.Pf

ATCP 76.16(3)(b)3. 3. If a pool is closed due to a water sample that contains total coliforms pursuant to s. ATCP 76.30 (1) (b), the pool can be reopened when the pool system is properly working, the disinfectant or sanitizer concentration is maintained pursuant to s. ATCP 76.14 Table A, and any fecal accidents have been treated pursuant to s. ATCP 76.31. P

ATCP 76.16(4) (4) Algae control. An algaecide may be used in a pool pursuant to ss. ATCP 29.50 (4) (b) 1. and 76.14 (2), according to the manufacturer’s label directions. P

ATCP 76.16 History History: CR 22-021: cr. Register June 2023 No. 810, eff. 9-24-23; correction in (4) made under s. 35.17, Stats., Register June 2023 No. 810.

ATCP 76.17 ATCP 76.17 Water test kits.

ATCP 76.17(1) (1) Approved. A test kit of a type approved by the department shall be maintained for testing the pool water pH; the disinfectant or sanitizer residual; the combined chlorine level, when chlorine is used; the total alkalinity; and the cyanuric acid concentration. The test kits shall meet the following specifications, as described in s. ATCP 76.17 Table A. Pf

s. ATCP 76.17 Table A Required Test Kit Accuracy
and Increment

ATCP 76.17(2) (2) Test reagents use and storage. Test kit reagents shall meet all of the following:

ATCP 76.17(2)(a) (a) Stored. Stored in the original container or per manufacturer directions. Pf

ATCP 76.17(2)(b) (b) Replaced. Replaced as recommended by the manufacturer. Pf

ATCP 76.17(2)(c) (c) Temperature range. Stored within the temperature range specified by the manufacturer for storage. Pf

ATCP 76.17(2)(d) (d) Use. Used and properly disposed of before the expiration date. Pf

ATCP 76.17(3) (3) Testing reagent technologies. The disinfectant or sanitizer testing reagent shall use one of the following technologies:

ATCP 76.17(3)(a) (a) Method. Diethyl–p–phenylene diamine or DPD in powder or liquid form. A test kit using the titrimetric method, ferrous ammonium sulfate and diethyl–p–phenylene diamine or FAS-DPD for chlorine and bromine testing and colorimetric comparators used for additional water testing shall be approved by the department and shall provide for accurate comparison in the required range for each test pursuant to s. ATCP 76.14 Table A.Pf

ATCP 76.17(3)(b) (b) Alternatives. Other photometric, electronic, or other technology that achieves the accuracy as described in s. ATCP 76.17 Table A, and measures analytes within the range pursuant to s. ATCP 76.14 Table A. Pf

ATCP 76.17 History History: CR 22-021: cr. Register June 2023 No. 810, eff. 9-24-23.

ATCP 76.18 ATCP 76.18 Water testing frequency.

ATCP 76.18(1) (1) All pools, except whirlpools, therapy, and excercise pools.

ATCP 76.18(1)(a) (a) pH and disinfectant or sanitizer. Except as provided under sub. (3), water shall be tested for pH and disinfectant or sanitizer residual at the following times:

ATCP 76.18(1)(a)1. 1. Daily before the pool is open to the public or before the pool is in use. Pf

ATCP 76.18(1)(a)2. 2. At least one other time during the day’s peak patron load.Pf

ATCP 76.18(1)(b) (b) Combined chlorine. If chlorine is used, the water shall also be tested at least twice a week for the combined chlorine level. Pf

ATCP 76.18(1)(c) (c) Alkalinity. Water shall also be tested at least once a week for total alkalinity. Pf

ATCP 76.18(1)(d) (d) Cyanuric acid. If cyanuric acid is used in the water basin, the cyanuric acid concentration in the water shall be tested at least once a week. Pf

ATCP 76.18(2) (2) Whirpool, therapy, and exercise pools.

ATCP 76.18(2)(a) (a) pH and disinfectant or sanitizer. Except as provided under sub. (3), water shall be tested for pH and disinfectant or sanitizer residual at the following times:

ATCP 76.18(2)(a)1. 1. Before the pool is open to the public or before the pool is in use and at least 4 times daily. Pf

ATCP 76.18(2)(a)2. 2. Two of the tests shall be during the day’s peak patron load.Pf

ATCP 76.18(2)(b) (b) Combined chlorine. When chlorine is used, the water shall be tested at least once daily for the combined chlorine level. Pf

ATCP 76.18(2)(c) (c) Alkalinity. Water shall be tested at least once a week for total alkalinity. Pf

ATCP 76.18(2)(d) (d) Cyanuric acid. When cyanuric acid is used in the water basin, the cyanuric acid concentration in the water shall be tested at least once a week. Pf

ATCP 76.18(3) (3) Electronic monitoring device. For a properly maintained electronic monitoring device installed to control pH and disinfectant or sanitizer, the operator shall:

ATCP 76.18(3)(a) (a) Frequency. Manually tested the pool at least once a day for pH and disinfectant or sanitizer residual with an approved test kit pursuant to s. ATCP 76.17 Table A. Pf

ATCP 76.18(3)(b) (b) Maintenance. Periodically monitor the device to determine if it meets operating criteria pursuant to s. ATCP 76.14 (5). Pf

ATCP 76.18(4) (4) Increased testing. The department or its agent may require more frequent testing if the testing logs are not maintained and the operator demonstrates a lack of active managerial control.Pf

ATCP 76.18 History History: CR 22-021: cr. Register June 2023 No. 810, eff. 9-24-23.

ATCP 76.19 ATCP 76.19 Water supply and temperature.

ATCP 76.19(1) (1) Water supply protection. A minimum air gap of 2 pipe diameters or 6 inches, whichever is less, shall exist between the potable water supply inlet and the overflow point of any pool, makeup tank, surge tank, solution tank, or slurry tank unless another approved backflow and backsiphonage prevention device is provided. P

ATCP 76.19(2) (2) Water source. The water supplied to a pool shall be from a source approved by the Wisconsin department of natural resources pursuant to ch. NR 108, 811, or 812. P

ATCP 76.19(3) (3) Water level. Proper water level shall be maintained at all times when the pool is open. Pf

ATCP 76.19(3)(a) (a) Skimmers. Water levels in pools with skimmers shall be maintained at a level such that the weir is half submerged or in the case of a floating weir, used according to manufacturer’s directions. Pf

ATCP 76.19(3)(b) (b) Gutters. Pools designed with gutters shall have a continuous water supply over the gutter to provide effective skimming. Pf

ATCP 76.19(4) (4) Water temperature.

ATCP 76.19(4)(a) (a) Thermometer accuracy and location.

ATCP 76.19(4)(a)1. 1. An accurate thermometer shall be located in the pool water return line. Pf

ATCP 76.19(4)(a)2. 2. The thermometer shall be accessible for observation by the operator. Pf

ATCP 76.19(4)(b) (b) Pool water temperature.

ATCP 76.19(4)(b)1. 1. Except as provided in par. (d), the water temperature of an indoor pool shall be between 70°F or 21°C and 90°F or 32°C. P

ATCP 76.19(4)(b)2. 2. The minimum water temperature for an outdoor pool shall be 65°F or 18°C. P

ATCP 76.19(4)(c) (c) Whirlpool water temperature. The water temperature in a whirlpool shall be greater than 90°F or 32°C, and may not exceed 104°F or 40°C. P

ATCP 76.19(4)(d) (d) Cold soak pool water temperature.

ATCP 76.19(4)(d)1. 1. Cold soak pools may be operated at a lower temperature than specified under par. (b).

ATCP 76.19(4)(d)2. 2. The pool shall post the water temperature on signage pursuant to s. ATCP 76.29 (5). Pf

ATCP 76.19 History History: CR 22-021: cr. Register June 2023 No. 810, eff. 9-24-23.

subch. IV of ch. ATCP 76 Subchapter IV — Staffing Pools

ATCP 76.20 ATCP 76.20 Operator.

ATCP 76.20(1) (1) Pools.

ATCP 76.20(1)(a) (a) General requirement. Each pool shall be under the supervision of at least one operator, except that if multiple pools are located on the same premise, and licensed by the same person, they may be supervised by one operator. Pf

ATCP 76.20(1)(b) (b) Operator responsibilities. Each operator shall be responsible for pool operation and maintenance including equipment shut-down, backwashing, daily maintenance and vacuuming, and maintenance of water quality pursuant to ch. ATCP 76. Pf

ATCP 76.20(2) (2) Pool operator certification.