In Minnesota, public swimming pools and spas are regulated by the Minnesota Department of Health (MDH) under Minnesota Rules Chapter 4717. A significant update to the Minnesota Pool Code went into effect in February 2022, and for the 2026 season, enforcement focuses heavily on automated record-keeping and drain safety.
Minnesota distinguishes between "new construction" and "existing" pools regarding barrier height.
Minimum Height:
New Construction (post-2022): Must be at least 5 feet (60 inches) high.
Existing Pools: May remain at 4 feet (48 inches) unless a substantial remodel occurs.
The "Non-Climbable" Rule: Fencing must be designed to prevent climbing. For chain-link, the mesh must be 1.75 inches or smaller.
Gates: Must open outward (away from the pool), be self-closing, and self-latching.
Latch Height: To prevent child access, the latch must be at least 54 inches from the ground.
Clearance: The gap between the bottom of the fence and the ground must be no more than 2 inches.
Minnesota inspectors have the authority to close a pool immediately if any "critical items" are out of range.
Standard Ranges:
Free Chlorine: 1.0 to 10.0 ppm (2.0–4.0 ppm is the "ideal" target).
pH Levels: Strictly 7.2 to 7.8.
Combined Chlorine: Must not exceed 0.5 ppm.
Clarity (The Main Drain Test): The main drain (the deepest part of the pool) must be clearly visible from the deck. If the water is cloudy, the pool must be closed.
Fecal/Vomit Incidents: Minnesota follows specific CDC-aligned decontamination protocols. The pool must remain closed for at least one full "turnover" (typically 6 hours) after hyperchlorination.
Every public pool in Minnesota must be operated under the direct supervision of a Trained Operator.
Certification: The operator must complete an MDH-approved course (like the CPO or AFO) at least once every 5 years.
Posting: A copy of the operator’s valid certificate must be posted at the facility whenever the pool is open.
Response Time: The trained operator (or a designated alternate) must be reachable and able to respond to the facility at any time it is open.
Minnesota requires one "unit" of lifesaving equipment for every 2,000 square feet of pool surface area.
The Unit Includes:
A 12-foot (minimum) fixed-length life pole or shepherd’s crook with blunted ends.
A ring buoy with an attached rope that is 1.5 times the width of the pool (max 60 feet).
Emergency Phone: * If a lifeguard is present, a phone must be in or immediately adjacent to the pool area.
If no lifeguard is present (semi-public), a sign must be posted in plain view indicating the location of the nearest telephone and the emergency number (911).
First Aid: A first aid kit must be readily accessible and stocked with items like gloves and rescue breathing masks.
Minnesota requires rigorous record-keeping. Logs must be kept for 6 years.
Daily Log Requirements: For every day the pool is in use, you must record:
Disinfectant residuals (Free and Total).
pH and temperature.
Flow rate meter readings.
Daily Physical Inspection of the drain covers/grates (crucial for VGB Act compliance).
Injury Reporting: Any incident resulting in death or a "serious injury" (requiring ER or doctor attention) must be reported to the MDH by the end of the next working day.
Minnesota Rules Chapter 4717 (Full Text): The official state administrative rules for public pools.
MDH Public Swimming Pool Portal: The primary hub for plan reviews, operator training info, and safety checklists.
MDH 2026 Operating a Safe Public Pool (PDF): A comprehensive guide for facility owners and operators.
Minnesota Pool Phone Cellular Guidelines: Details on modernizing emergency communication to meet the 2026 code.
Note for 2026: Minnesota is increasingly strict about automated chemical feeders. If your feeder fails, you are generally not allowed to "hand-feed" chemicals while the pool is open to the public; the pool should be closed until the mechanical system is repaired.
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