Wisconsin Legislature: ATCP 76.14(6)(b)

(e) Valve. The cylinder valve shall be closed when in storage or empty. Pf

(4) Chemical feeding. Disinfectant or sanitizer and filter aid feeding shall be conducted as follows:

(a) Positive displacement disinfectant or sanitizer feeding.

1. Liquid chemicals shall be fed into water circulation piping or a surge tank or vacuum filter by means of a positive displacement feeder either at full strength or diluted.

2. A 2-tank system shall be used, if calcium hypochlorite or another chemical that forms a residue is used. One tank shall be used for mixing the solution and settling the precipitate. The clear liquid shall be decanted or siphoned into the second tank for distribution. Pf

(b) Flow-through feeders. The chemical used, the manner of usage, and the quantity used in a flow-through feeder shall be as recommended by the feeder manufacturer. Pf

(c) Dry feeders. Feeders used for feeding dry chemicals into water circulation piping, a surge tank, or vacuum filter shall be maintained for proper operation. Pf

(5) Chemical concentrations and residuals.

(a) Minimum disinfectant or sanitizer residuals. Minimum disinfectant or sanitizer residuals shall meet the requirements pursuant to s. ATCP 76.14 Table A. P

(b) Cyanurates. All the following apply:

1. The water cyanuric acid concentration may not exceed 30 ppm. Pf

2. The pool shall be closed pursuant to s. ATCP 76.30 (1) (j), if the cyanuric acid level is above 300 ppm. P

(d) Alkalinity. The total alkalinity of pool water shall be maintained between 60 and 180 ppm as calcium carbonate unless it can be shown by the operator that another level of total alkalinity produces chemically balanced water based on calculations approved by the department. Pf

(e) Combined chlorine.

1. The operator shall develop and implement a plan to minimize combined chlorine in the pool. Pf

2. The plan shall contain all the following components: Pf

a. The combined chlorine action level, taking into account monochloramine in the source water.

Note: It is recommended that an action level of 0.4 ppm be used for combined chlorine for either breakpoint chlorination or water replacement or a combination of both to occur.

b. Volume of pool.

c. Range of volume of fresh source water added to pool each day.

d. Description of showering requirements and how communicated to patrons.

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.

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

(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)

- See PDF for table

(6) Electronic monitoring devices.

(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

(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

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

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

(1) Chlorine generators.

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

(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

(2) Ozone generators.

(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

(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

(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

(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

(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

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

ATCP 76.16 Water quality.

(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

(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

(3) Water sampling.

(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

Note: A list of accredited laboratories may be obtained by calling the department at (608)224-4712 or by email at www.datcp.state.wi.us.

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

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.

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

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

(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

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 Water test kits.

(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

- See PDF for table

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

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

(b) Replaced. Replaced as recommended by the manufacturer. Pf

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

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

(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

(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

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

ATCP 76.18 Water testing frequency.

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

(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:

1. Daily before the pool is open to the public or before the pool is in use. Pf

2. At least one other time during the day’s peak patron load.Pf

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

(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

(2) Whirpool, therapy, and exercise pools.

(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:

1. Before the pool is open to the public or before the pool is in use and at least 4 times daily. Pf

2. Two of the tests shall be during the day’s peak patron load.Pf

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

(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

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

(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

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

(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

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

ATCP 76.19 Water supply and temperature.

(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