In Illinois, public and semi-public swimming facilities are regulated by the Illinois Department of Public Health (IDPH) under the Swimming Facility Code (77 Ill. Adm. Code 820).
As of 2026, Illinois has modernized its inspection protocols and introduced a mandatory local permitting mandate for all municipalities to ensure consistent enforcement across the state.
By law, all Illinois municipalities were required to develop a formal permitting process for swimming pools by January 1, 2026.
Mandatory Inspections: All permitted pools must now be inspected by the local municipality before receiving an initial permit and at least once every 5 years thereafter.
Annual Renewal: Standard annual permits (like those in DuPage County) typically begin on May 15 and expire on May 14 of the following year.
IDPH Construction Permits: Even with local permits, any major change—including simply replacing a main drain cover—often requires a formal construction permit from the state IDPH.
Illinois focuses heavily on preventing fecal-related disease outbreaks, which have historically been the most common source of pool-related illnesses in the state.
Standard Chemistry Ranges:
Free Chlorine: Minimum 1.0 ppm (max 10.0 ppm).
pH Levels: Must be strictly maintained between 7.2 and 7.6 (the "Ideal" range, though code allows up to 7.8).
The "Diaper Rule": IDPH requires all children who are not toilet trained to wear tight-fitting rubber or plastic pants over a swim diaper.
Clarity: The water must be clear enough that the bottom of the pool is clearly visible at the deepest point.
Microbiological Testing: For public beaches, samples are required every two weeks. If results exceed 235 cfu/100mL, the beach is ordered to close immediately.
Illinois code provides specific verticality and height requirements to prevent climbing (Section 820.200).
Height: The pool area must be enclosed by a barrier at least 4 feet (48 inches) high, measured on both the inside and outside.
Bottom Gap: The height of the opening under the bottom of the barrier cannot exceed 4 inches.
Gate Security: Gates must be self-closing and self-latching.
Wall Design: For pools deeper than 42 inches, walls must be vertical for at least the first 3 to 5 feet below the water level to prevent accidental slips.
Illinois is very specific about the accessibility of emergency communication devices (Section 820.310).
Location: A telephone must be accessible within the pool area or within 300 feet of the pool enclosure.
Multi-Level Rule: At a multi-level facility (like a high-rise hotel), the phone must be located within three levels of the pool.
Signage: The phone must be "hard-wired" and have a conspicuous sign listing:
The name, address, and telephone number of the swimming pool.
Emergency numbers for 911, local police, fire, and the nearest hospital.
Accessibility: If the pool is a Class A or B (public/semi-public) pool, the phone can be located inside or outside the yard as long as it is non-pay and readily accessible.
Rescue Gear: Every 2,000 square feet of water requires:
One U.S. Coast Guard-approved ring buoy with a rope (length equal to the pool width or 50 feet).
One life hook or shepherd's crook at least 12 feet long.
Lifeguard Ratios: Generally, one lifeguard is required for every 2,000 square feet of water surface.
First Aid: At least one first aid kit, stocked according to IDPH Appendix B, must be on-site and kept current.
77 Ill. Adm. Code 820 (Full Swimming Facility Code): The primary legal document for Illinois pool design and operation.
IDPH Swimming Facilities Portal: Central hub for state-level permits, beach sampling data, and illness reporting.
DuPage County Health Dept - Pool Program: An example of local 2026 permit renewal schedules and inspection report lookups.
Illinois Pool Code 2026 Quick Reference: A technical guide for operators regarding cellular pool phone compliance.
Note for 2026: Illinois now requires all municipalities to have a permitting ordinance in place. If you are in a smaller town, double-check with your local clerk's office, as many updated their rules late in 2025 to comply with the state's January 1st deadline.
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