By Tori Mason

DENVER (CBS4)– A lot more goes into practicing safe swimming than keeping an eye on your little ones while they are in the water and it could be days before symptoms appear.

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The Colorado Department of Public Health and Environment reminds people to protect themselves from recreational waterborne illnesses such as cryptosporidiosis (Crypto) and giardiasis (Giardia).

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Crypto and Giardia are parasites that cause intestinal problems. They can survive in water for days, even in chlorinated pools.

They’re mostly spread by swallowing water contaminated by infected feces.

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That’s why it’s important that parents change diapers away from the poolside and take kids on bathroom breaks every hour.

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Symptoms like nausea, diarrhea and stomach cramps can show up anywhere from two days to four weeks after swallowing the parasite.

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Nicole Schneider recently visited a public pool with her son started noticing these symptoms. He ended up in the emergency room.

“Sometimes kids don’t know that they’re swallowing water. I try to make sure that they take a deep breath and hold their breath. Parents should be very careful about changing diapers around the water and if a child has an accident they should alert a lifeguard so that other children are not at risk,” said Schneider.

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Symptoms typically begin two days to four weeks, or one week on average, after swallowing the parasite and can come and go for a month or longer.

If you think you are experiencing any of those symptoms and you’ve been in a public swimming area, contact the Colorado Department of Public Health and Environment at 303-692-2700 and your doctor.

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Tori Mason is an award-winning reporter for CBS4 This Morning. Follow her on Twitter @ToriMasonTV.