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What is the Model Aquatic Health Code (MAHC)?
Quick answer
The Model Aquatic Health Code (MAHC) is a CDC-published voluntary model code for public aquatic facilities including splash pads. It covers design, construction, operation, maintenance, and policy. About half of US states have adopted MAHC sections. Updated every 3 years through public comment.
The Model Aquatic Health Code (MAHC) is the CDC's voluntary model code for public swimming pools, splash pads, water parks, and other aquatic venues. It's a 600+ page document covering design and construction (Module 4), operation (Module 5), and policy and management (Module 6). The CDC publishes it as a free PDF and updates it every 3 years through formal public comment. Roughly half of US states have adopted at least some MAHC sections — typically the chemistry and operator-of-record sections — into their own state codes. MAHC pioneered the now-standard requirement for secondary disinfection (UV or ozone) on recirculating splash pads, after multiple Cryptosporidium outbreaks in the 2000s. Operators studying for CPO or AFO certification will see MAHC concepts repeatedly. Worth a read for anyone designing or operating a splash pad. Search 'CDC Model Aquatic Health Code' to download.