Respond to a fecal incident in a pool following current CDC protocols, distinguishing formed-stool from diarrheal events
domain: cdc.gov · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Clear all patrons from the pool immediately and determine whether the incident is formed stool or diarrheal/loose stool — this determines which protocol applies
For formed stool: remove the material with a net or scoop (never vacuum), raise free chlorine to at least 2 ppm, hold pH at 7.2-7.5, and maintain circulation/filtration for the CDC-specified minimum contact time before reopening
For diarrheal incidents: keep the pool closed and treat as a potential Cryptosporidium exposure — follow CDC's CT-based hyperchlorination table, which sets required free chlorine level and contact time based on the pool's cyanuric acid concentration
Do not shortcut the diarrheal protocol using formed-stool contact times — diarrheal incidents require much longer/higher treatment because Crypto oocysts are highly chlorine-resistant
Backwash or clean filters per protocol after treatment, since filtered material can harbor oocysts
Document the incident: date/time, stool type, chlorine/pH/CYA readings, and time water was reopened, per CDC's recommended fecal-incident log
Known gotchas
Required free chlorine level and contact time for diarrheal incidents depend on CYA concentration — pull exact figures from CDC's current fecal incident response table rather than a single memorized number
A common and dangerous mistake is treating a diarrheal incident with the lighter formed-stool protocol (about 2 ppm for 25-30 minutes) — this will not inactivate Cryptosporidium
Vacuuming a formed-stool incident instead of netting it can spread contamination into the filtration system
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