The Water in Your Pool May Not Be as Clean as You Think

ABC News' Phillip Mena reports the latest news from the CDC about waterborne diseases in the summertime months.
3:02 | 08/17/15

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Transcript for The Water in Your Pool May Not Be as Clean as You Think
up vest Gates." How clean is the pool you're swimming in? July and August are when water-borne diseases are on the rise. Phillip Mena has what you need to watch out for in public pools. He's expose ore kids. That's very concerned to me. Reporter: Two Las Vegas pools closed and cleaned's spring. Our sample was positive. Reporter: Bacteria closed down this Florida pool for cleaning. A CDC report found that 1 in 8 public pools nationwide were closed immediately upon routine inspection. In metropolitan Atlanta, those Numbers are higher. 1 in 6 according to an "Atlanta journal cost constitution" investigation. "Gma" investigates wanted to know what was lurking in your pool. We went undercover to collect samples. Our expert, Dr. Amy Kirby wasn't told what pools we were testing. We tested for six types. Reporter: Fecal bacteria, E. Co coli, staff, and pseudomonis. All three pools contained fecal bacteria above the limits set. If you swam, there would be a risk of contracting any number of diarrheal illnesses. Skin infections. Particularly with open wounds. Reporter: Her recommendation, each pool should be closed and shocked. Raise the chlorine level, let it run about 12 hours, then reopen the pool. Reporter: After our producer called pool number one, it was closed, cleaned, and reopened. Pool number two was already closed for the season. We called multiple times to the third pool. We got no response. We wept in person to get answers. Hi, we're from ABC news, we've been trying to get hold op you. Are you the manager? This woman hides behind a pole. Refusing to answer our questions. Another tells us to call man from the pool management company. Out of caution, would you close and shock the pool? He says since our number were from four days ago, it's already been fixed. The pool was well chlorinated. To protect your family, the CDC says you should ask to see the pool's inspection and maintenance record. For "Good morning America," Phillip Mena, ABC news, Atlanta. Information we kind of knew but -- good to be reminded. I just swam yesterday. I'm so grossed out right now.

This transcript has been automatically generated and may not be 100% accurate.

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