The Threat Hiding in Swimming Pools: Is It in Yours?


Memorial Day weekend marks the unofficial start to pool season, but you might want to think twice this year before diving in. There’s something scary lurking in those placid blue-green waters.

The culprit, it turns out, is a particularly virulent microscopic parasite known as Cryptosporidium, also known as “Crypto.” According to the Centers for Disease Control and Prevention, it’s rising to epidemic levels in America’s pools and hot tubs. It has led to all sorts of unpleasant, even dangerous illnesses. And, just in case you’re not sufficiently alarmed/grossed out yet, its rise is linked to the increase in fecal matter found in your bubbling backyard oasis.

OK, let’s take a step back. What the heck is all that waste matter doing in your pool in the first place? Easy. The excrement in question comes from toddlers having accidents or trace amounts on any swimmer, from humans to pets (hey, what’s the dog doing in the pool again?). Read more.