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Natalie Hood continues her conversation with Dewey Case of the Council for the Model Aquatic Health Code, separating cold-plunge science from wellness-industry hype.
Cold plunges may be popular, but cold water changes chemical reaction rates, sanitizer performance, testing accuracy, and the body’s physiological response. Being young, athletic, or highly experienced around water does not make anyone immune to blood-sugar crashes, loss of consciousness, drowning, or other emergencies.
Natalie and Dewey discuss why cold-water samples should be allowed to warm before testing, why commercial plunges should strongly consider supplemental treatment such as UV, ozone, or advanced oxidation, and why a quick pre-entry rinse can remove a surprising amount of contamination before it enters a very small body of water.
They also address the biggest myth of all: because someone only spends a few minutes in a cold plunge, the risk must be low. The exposure may be short, but the risks are not necessarily smaller—they are simply different.
Topics discussed include:
- Why even healthy, conditioned athletes can experience emergencies
- The dangers of using a cold plunge, pool, or spa alone
- How cold temperatures affect water-testing reactions
- Why cold samples should be capped and warmed before testing
- Reduced sanitizer reaction rates in cold water
- Why small water volume and heavy bather loads create greater risk
- The value of UV, ozone, and advanced oxidation
- Sweat, ammonia, urea, dirt, and everything else bathers drag into the water
- Why pre-entry showers matter
- How a simple rinse can substantially reduce contaminants
- Why short exposure does not automatically mean low risk
- The importance of supervision, maintenance, testing, and operator diligence
The takeaway is simple: be diligent. Know what the water is doing, test it regularly, maintain the vessel properly, and never assume that experience or physical fitness makes someone bulletproof.
Download the Cold Water Venue Guidance from the Council for the Model Aquatic Health Code.
Natalie also shares an update on her Tennessee Triple Crown Open Water Swim Challenge. She will swim more than 21 miles across three open-water marathon events to benefit Every Child a Swimmer through her fundraiser, She Swims So They Can.
Special thanks to campaign sponsors Revved Up Apparel, H2Flow Controls, Tenjam, and Talking Pools Podcast.
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