(NEW YORK) -- When you dive into the cool, crisp water at your local pool on a hot summer day, concern over microbes may not be the first thing that goes through your mind. But that chlorinated water may not be as clean as you would think.
In 2009, a survey by a group known as the Water Quality and Health Council found that one in five people urinate in the pool -- a problem that may have more implications for your health than the simple "ick factor."
The Water Quality and Health Council is sponsored by Chlorine Chemistry Division of the American Chemistry Council, an industry trade association. It's a group that would arguably want people to have the cleanliness of their pools in mind.
Still, simple chemistry supports the notion that urine can actually deplete the chlorine levels in pools. At the root of the problem is the interaction between the ammonia in urine and the chlorine in a pool, which forms a chemical called chloramine.
Aside from potentially giving off noxious fumes, chloramine, it turns out, is actually less effective at killing bacteria than chlorine, possibly leading to an increased risk of water-borne infections.
This might not be such a problem if people heeded the imperative commonly posted on signs at public pools that advises them to shower before they get into the water -- a step the U.S. Centers for Disease Control and Prevention calls "the first defense against germs that can make swimmers sick." But the Water Quality and Health study revealed that nearly 70 percent of people taking a dip in the pool do not shower beforehand.
The CDC reports that in 2008, poor water quality led to one out of every eight public pool closings. Those pool closings are for a good reason; past reports suggest many have fallen victim to infections from the pool.
One such victim is Brody Weiss, son of ex-Atlanta Braves Shortstop Walt Weiss. Brody contracted E. coli from a recreation park wading pool in 1998 when he was 3-years-old. After Brody became ill, tests at the park revealed chlorine levels below the level needed to kill E. coli.
And it's not just E. coli. Health experts say that chloramine can also lead to wide varieties of bacterial infections including shigella, campylobacter, salmonella, hepatitis A and other forms of parasitic infections. In addition, chloramines -- not chlorine itself -- are often responsible for those stinging red eyes that we normally associate with a day at the pool.
The good news is that the CDC offers tips that you can follow to safeguard yourself and everyone around you when it comes to pool etiquette:
-- Don't swim when you have diarrhea.
-- Don't swallow pool water.
-- Practice good hygiene. Shower with soap before swimming and after swimming. Wash your hands after using the toilet or changing diapers.
-- If you are taking your kids to the pool, be sure to give them frequent bathroom breaks or check their diapers often.
-- Change diapers in a bathroom or a diaper-changing area, not at poolside.
-- Wash your children thoroughly (especially the rear end) with soap and water before they go swimming.
Copyright 2012 ABC News Radio