The Model Aquatic Health Code (MAHC) is the CDC's voluntary, national-level reference code for public pools, spas, and aquatic venues. It's not federal law, but it's the template your state and county are borrowing from when they update pool code. Understanding the MAHC means understanding where your local code is going.
What the MAHC is — and isn't
- Is: A comprehensive, voluntary model code covering design, construction, operation, and maintenance of public aquatic facilities
- Is: Developed by the CDC in collaboration with public health, industry, and academic partners
- Is: Updated every 3 years by the Council for the Model Aquatic Health Code (CMAHC)
- Isn't: Federal law
- Isn't: Enforced by the CDC (states/counties enforce their own adopted code)
Why the MAHC exists
Before the MAHC, every state had its own pool code — often decades out of date, often missing RWI-specific provisions, often in contradiction with modern industry standards. The MAHC was launched to give states a modern, science-based reference they could adopt whole or in pieces.
As of recent updates, jurisdictions representing a majority of US public pools have adopted at least portions of the MAHC. Florida's DOH pool code includes many MAHC-aligned provisions.
Key topics the MAHC covers
- Design and construction of pools, spas, splash pads, wading pools
- Disinfection requirements (including secondary UV/ozone for high-risk venues)
- Water chemistry parameters and testing frequencies
- Filtration, turnover, and hydraulic design
- Lifeguarding, supervision, and training
- Hygiene facilities (showers, restrooms, diaper stations)
- Fecal and vomit response protocols
- Recordkeeping requirements
- Electrical safety, ventilation, air quality for indoor pools
- Accessibility (incorporating ADA)
The CMAHC — who runs the updates
The Council for the MAHC is a non-profit that manages the update process. Every 3 years, they run a structured proposal-and-vote cycle where industry members, operators, public health professionals, and the CDC propose changes. Approved changes become part of the next MAHC edition.
Operators and technicians can join the CMAHC and vote on proposed changes. It's one of the few forums where frontline operators can directly shape the code that will eventually regulate them.
How to use the MAHC as an operator
- Read your state/county pool code first — that's what's legally enforced.
- Cross-reference with the current MAHC for topics where your code is silent or vague.
- When your code is stricter than the MAHC, follow your code.
- When the MAHC is stricter than your code, consider the MAHC as best-practice guidance.
- Watch for MAHC updates — they often preview what's coming to your local code next.
Topics the MAHC leads on
Areas where the MAHC is typically ahead of state codes:
- Secondary disinfection for high-risk venues — UV or ozone required on splash pads, therapy pools
- CYA upper limits — MAHC pushes toward 30–50 ppm max, stricter than many state codes
- Indoor air quality — source-capture ventilation specifications
- RWI response protocols — step-by-step fecal/vomit procedures that many codes don't specify in detail
- Staff training requirements — CPO or equivalent recommended for all operators