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Cryptosporidium outbreak associated with Bothell pool
Investigators said five swimmers were tested and four had crypto as the parasite spread after one infected pool user.
On Sept 30, Public Health Seattle-King County linked 14 cases of crypto to the McMenamins Anderson School pool in Bothell following exposure on Aug 29–30, 2026.
Even in well-maintained pools, Cryptosporidium resists chlorine and can survive for several days; Public Health determined the McMenamins facility follows King County health requirements.
Laboratory testing confirmed four of five symptomatic individuals who spent time in the pool had crypto, with symptoms typically appearing 2–10 days after infection.
PREVENTION Public Health advises, "Don't go to a pool if you're sick!" and recommends avoiding public pools for at least 2 weeks after being sick.
The CDC notes crypto is common, with over 800,000 cases annually in the U.S.; those suspecting illness from a pool should submit complaints via Public Health Service Request Access.