In Wisconsin, public swimming pools and water attractions are governed by the Department of Agriculture, Trade and Consumer Protection (DATCP) under Chapter ATCP 76.
As of 2026, Wisconsin has fully integrated the latest revisions to the code, which include stricter requirements for CPR recertification and more rigorous "Interlock" testing for chemical feed systems.
Wisconsin uses a "Reasonable Response" model for facility management, requiring a Certified Pool Operator (CPO) to be available to address issues quickly.
3-Hour Response Time: A CPO must be able to respond to a pool issue within 3 hours of being notified.
CPR Recertification (New for 2024–2026): Lifeguards using American Red Cross or Anderson 360 certifications must now renew their CPR certification annually, rather than every two years, to remain in compliance with the state’s safety benchmarks.
Water Chemistry:
Free Chlorine: Minimum 1.0 ppm for pools; 2.0 ppm for spas.
pH Levels: Must stay between 7.2 and 7.8.
Cyanuric Acid: Strictly limited to 30 ppm in outdoor pools; prohibited in indoor pools and all spas.
Combined Chlorine: While the state recommends keeping levels below 0.4 ppm, there is no longer a strictly enforced limit; instead, operators must follow a "Combined Chlorine Management Plan."
Wisconsin requires all public pools to be enclosed by a fence or barrier that prevents "unintentional or unauthorized" access.
Height: The barrier must be at least 5 feet (60 inches) high.
Local Note: While the state baseline is 5 feet, some older municipal codes or residential/multi-family rules may still cite 4 feet, but 5 feet is the modern standard for new public construction.
Gate Security: Must be self-closing and self-latching.
Latch Height: The latch release must be at least 4.5 feet (54 inches) above the ground.
Gaps: No opening in the fence or under the fence may allow a 4-inch sphere to pass through.
Wisconsin’s emergency phone requirements are among the most specific regarding physical proximity (ATCP 76.26).
Location: A telephone must be located within 25 feet of the pool area.
Power Supply: The phone must have a permanent continuous power supply with a battery backup to ensure it works during a power outage.
Required Signage: A sign must be posted at the phone with the facility address and emergency dialing instructions.
System Interlocks: In the pump room, the chemical feed equipment must be "interlocked" with the circulation pump. If the main pump fails, the chemical feeders must automatically shut off to prevent "slugging" the pool with concentrated chemicals.
The "Lifesaving Unit": Every pool over 10 feet in length and 2 feet deep must have:
An intact shepherd’s crook pole long enough to reach the deepest part of the pool.
A ring buoy (minimum 20-inch diameter) with a rope at least 1.5x the pool's width (up to 50 feet).
Lifeguard Ratios: Generally, one lifeguard per 25 swimmers is required. Lifeguards must carry a rescue tube with the strap over their shoulder at all times while surveying the water.
Staffing Plan: Every facility with lifeguards must have a written "Staffing Plan" that includes a diagram of the pool and designated lifeguard stations to address visual obstructions.
"No Breath Holding": As of the latest code updates, activities involving prolonged breath holding are prohibited. Many facilities now include this in their mandatory "Pool Rules" signage.
Shower Rule: Patrons must be instructed to shower immediately before entering the pool and after using a sauna or steam room.
ATCP 76 (Full Wisconsin Administrative Code): The primary legal document for the safety and operation of public pools.
Wisconsin DATCP - Pool and Water Attractions: The central hub for license applications, plan reviews, and approved lifeguard courses.
Wisconsin Park and Recreation Association (WPRA) - Pool Code Updates: A practical guide for operators regarding recent 2024–2026 code changes.
Waukesha County Chemical Cheat Sheet (PDF): A helpful one-page guide for manual chemical testing and saturation index calculation.
Note for 2026: Wisconsin requires a Biohazard Disposal Kit (containing a scoop, spatula, sanitizing wipes, and biohazard bags) to be located at the first aid station or on the premises. This is a critical item during health inspections.
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