Waterborne diseases pose a risk during swimming and other outdoor fun

  • Written by Woodinville Weekly Staff

Swimming pools, beaches, lakes, and streams provide an opportunity to cool off during a summer that’s warmer than usual. Yet germs in the water can make people sick, especially young children, elderly people, and people with weak immune systems.

Germs that can cause waterborne illness include Cryptosporidium, Giardia, Shigella, E. coli and norovirus. In the past three years, three outbreaks of waterborne illness have been reported to state health officials – two in lakes and one in a swimming pool.

“It’s important to do all we can to protect ourselves and others from waterborne diseases when we take a dip into local pools, lakes, and rivers,” said State Epidemiologist for Communicable Disease Dr. Scott Lindquist. “Stay out of the water if you’re ill or have recently had diarrhea.”

One way germs enter swimming pools and water at beaches is when people who have or recently had diarrhea get in the water. According to the U.S. Centers for Disease Control and Prevention (CDC), the average child brings 10 grams of fecal material into the pool – equivalent to the weight of four pennies. However, even microscopic amounts of feces can carry enough germs to make other people sick.

Chlorine in swimming pools kills most germs, but some types of germs can resist chlorine for many days. Also, feces or other contaminants people introduce into the water from their bodies – such as urine, sweat, and dirt – can change how chlorine works, making it less effective.

To reduce germs in water, state health officials advise people to stay out of the water when ill with diarrhea; avoid urinating and defecating in the water; and take kids on frequent bathroom breaks, checking smaller children’s diapers every hour. Showering thoroughly with soap before getting in the water is also a great way to keep swimming waters clean.

Some beaches and swimming areas are monitored by public health agencies that put up signs to warn visitors when germs are in the water. It’s important to follow instructions on all posted signs. Because germs from sewage, pets, wild animals or other natural sources can get in the water, people should also avoid swallowing water from lakes or rivers. It’s crucial for hikers and campers who get their drinking water directly from a lake, stream or river to boil, filter or disinfect the water using the recommended methods.

In addition to diseases from germs, water recreation can lead to skin irritations such as hot tub rash, swimmer’s itch and swimmer’s ear. People should avoid swimming or allowing pets to play in water where there’s a visible scum; it may be a harmful algal bloom, a growing problem in Washington and the Pacific Northwest. Toxins produced by blooms can be harmful to people and animals. Check recent toxicity test results for your lake at

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