In Colorado, public and semi-public swimming pools are regulated by the Colorado Department of Public Health and Environment (CDPHE) under 5 CCR 1003-5 (Swimming Pools and Mineral Baths).
As of January 1, 2026, several Colorado counties (including Larimer and Pueblo) have fully transitioned to the Model Aquatic Health Code (MAHC), while the state standard continues to emphasize professional certification for operators and rigorous water quality monitoring.
Unlike many states that only recommend training, Colorado law mandates professional oversight:
Certified Operator: Each public or semi-public pool must have a Certified Pool Operator (CPO) or Aquatic Facility Operator (AFO) on staff or under contract to oversee the facility's safety and maintenance.
Lifeguards: Generally required for "public" pools (Class A). If a facility (like an HOA or small hotel) chooses not to have a lifeguard, it must post a "NO LIFEGUARD ON DUTY" sign and may be required to implement auto-locking gates and liability waivers.
Disinfection: Water must be automatically and continuously disinfected. The standard free chlorine range is generally 1.0 to 5.0 ppm (higher for spas).
Clarity Requirement: The water must remain clear enough that the main drain openings at the deepest part of the pool are clearly visible from the deck at all times.
Bacteriological Testing: In many jurisdictions, such as Pueblo and Larimer, health departments now conduct routine bacteriological sampling (testing for E. coli and Cryptosporidium) during inspections.
pH Levels: Must be maintained between 7.2 and 7.8.
Colorado has seen a shift in emergency phone requirements due to the phasing out of traditional landlines:
Pool Phones: Public pools must have an emergency telephone within 200 unobstructed feet of the pool.
Cellular Compliance: As of 2026, the state officially approves specialized cellular pool phones as a replacement for landlines, provided they are ADA-compliant and have a dedicated power backup.
Every facility must be equipped with:
Rescue Pole: A non-conducting reaching pole at least 16 feet long.
Ring Buoy: A U.S. Coast Guard-approved buoy with an attached throw line.
First Aid: A fully stocked first aid kit and a spine board (for supervised pools).
Depth Markers: Must be visible on both the deck (slip-resistant) and the vertical pool wall.
Colorado Swimming Pools and Mineral Baths Regulation (5 CCR 1003-5): The official state-level regulations and links to the Secretary of State version.
Larimer County 2026 Aquatic Health Regulations: A prime example of the new 2026 standards being adopted at the county level.
Denver Public Health - Pool Signage & Rules: Specific guidelines for facilities operating within the City and County of Denver.
CDPHE Natural Swimming Area Regulations: For operators of swim beaches and lake-based recreation areas.
Note for 2026: Many Colorado counties now charge inspection fees (ranging from $125 to $500+) assessed twice annually for year-round facilities. Check with your specific local health department (e.g., Tri-County, Jefferson, or El Paso) as they often have stricter requirements than the baseline state code.
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