Is it safe? The water in many public pools is contaminated with E. coli, a study finds. iStockphoto.com hide caption toggle caption iStockphoto.com Shots - Health News Everybody In The Pool! But Please Leave The Poop Behind May 16, 2013 Most public swimming pools are contaminated with germs carried by poop, federal researchers found. We swimmers are to blame. Showering before swimming and taking kids to the bathroom often would help.