Health officials say there are now more than 100 reported cases of cryptosporidium in Maricopa County.
The parasite can cause symptoms like diarrhea and is typically spread in swimming pools and other recreational water facilities.
The health department states Crypto, which can be highly contagious, is typically spread in swimming pools or other recreational water when an infected person swims or plays in the water, contaminating the water with fecal matter. Although chlorine kills most germs in swimming pools, Crypto can even survive in properly chlorinated water for long periods of time
Twenty Maricopa County facilities are at risk of being contaminated with crypto. Those facilities are being notified.
Anyone experiencing symptoms of crypto should avoid swimming and preparing food while symptoms last.