There is some risk of disease transmission when swimming in lakes and streams, but there are many steps you can take to reduce the risk.

What's in the Water? [click pictures for a larger view]

Blue-Green Algae (WA Dept of Health website) —Most blooms are non-toxic, but some produce toxins which can cause illness in pets and livestock after drinking lake water.

Bryozoans — Wondering what those large jelly-like blobs are in the lake? ...more

Leeches — Common in shallow, weedy shoreline areas of many lakes and streams. Learn how to remove one, if you find one on your skin....more

Swimmer's Itch [PDF] — A skin irritation caused by small parasites that burrow under the skin, found in lakes throughout Washington. ...more [PDF]

Avoid Contaminating Others

To avoid becoming a contamination source to others, follow these simple steps:

• Shower before you swim, if possible.
• Do not swim, or allow family members to swim, if currently ill with a gastrointestinal illness (vomiting and diarrhea), or have been ill within the last few days.
• Keep children who are not toilet trained out of the water.
• Do not allow children with dirty diapers in the water.
• Do not swim if you have a skin infection.
• Keep pets off the beach and out of the swimming areas.

If you are informed and practice these risk-reduction techniques, you can relax and enjoy the summer at your favorite swimming beach. And, please, share this information with others, so they, too, can enjoy the elements.

What Are the Symptoms?

• General waterborne illness: Symptoms may be visible from 1 day up to 4 weeks after being exposed and include: cramps, diarrhea, vomiting, fever, headache, and/or eye, ear and skin infections.
• Swimmer's itch symptoms: Include burning and itching of infected skin within 5 minutes to an hour after leaving the water, and small reddish pimples within 12 hours.
• Toxic blue-green algae symptoms: Similar to waterborne illness, but can also include numbness of the lips, tingling in the fingers and toes, and dizziness.

Prevent Swimming-Related Illnesses and Injuries

Here are some key things you can do to reduce your risk of illness and injury and make your trip to the beach safe and pleasant for your family:

• Avoid large crowds of bathers. The larger the number of swimmers, the higher the risk of illness transmission.
• Don’t swallow swimming water. It’s probably impossible to avoid swallowing some water while swimming, but the less you swallow, the less likely you’ll consume enough to make you sick.
• After swimming, wash your hands before eating.
• Avoid areas where there is animal waste or obvious sources of pollution nearby, such as sewage discharge or stormwater pipes, or other obvious sources of pollution nearby. There are many bacteria, viruses and parasites that cause disease in humans that can be spread by fecal waste from wild and domestic animals, and humans.
• Protect yourself from swimmer’s itch. Avoid swimming in areas where there is evidence of ducks and geese. Apply a good waterproof sunscreen prior to entering the water. And use a towel to dry off immediately after swimming.
• Prevent drowning. Know where safety equipment, such as ring buoys and reaching poles, are located. Make sure personal floatation devices are available and are worn when boating. These are especially important for persons using canoes, inflatable boats, jet skis, and other powerboats. Carefully supervise young children and poor swimmers when near the water.
• Avoid swimming in areas where there are obvious algae blooms. Some blue-green algae produce toxins, which have caused illness in pets and livestock. Keep children and pets out of the water when an algae bloom is present. For more information, see Toxic Blue-Green Algae [PDF].