You Won’t Believe What Could Be Growing in Your Tap Water

You'll never look at your faucet the same way again.

Water tap with flowing water. Selective focus, shallow depth of fieldGyvafoto/ShutterstockIn most parts of the United States, we’re privileged to have access to clean drinking water with a simple turn of the tap. Sure, we may use a filter for a smoother taste, but, by and large, our tap water feels safe. However, a new study reveals there could be something lurking in our H2O that wasn’t previously detectable.

Researchers recently found bacteria in tap water can actually proliferate if a faucet has gone unused for a few days.

What kind of bacteria, you ask? According to a University of Illinois study, the same microbial communities associated with such illnesses as Legionnaires’ disease.

Before you vow to never use your faucet again, first understand this: Plenty of innocent microbes already live in our tap water and researchers attest that the bacteria found in the study don’t appear to present a health risk, no matter how icky the thought of it might sound.

To collect their findings, the study authors took tap water samples from three separate dormitories on the University of Illinois campus before the school closed for a break and then again just ahead of the students’ return.

“Our results suggest that the increase in bacteria in the post-stagnation samples is a result of something occurring in the interior plumbing, not the outside city source, and in pipe segments closest to the taps,” said Wen-Tso Liu, co-author of the study and a civil and environmental engineering professor, in a press release from the University of Illinois at Urbana-Champaign.

Researchers believe that the influx of bacteria in the post-stagnation samples is due to the interaction between the biofilm on the inside of plumbing pipes and the tap water. They also learned that bacteria was heaviest in the first 100 milliliters of flowing tap water once a faucet had gone back into use after a period of rest. With that in mind, if you’re returning from a vacation or weekend away, Liu suggests running your faucet for a minute or two before filling your glass.

“It is contrary to what we have learned about conserving water, but I like to think of it as just another basic hygiene step,” he says. “We have made a habit out of washing our hands; I think we can make a habit out of running the tap for few moments before use as well.”

Read on to discover the common household items that may be poisoning your air.

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