6/11/2025

KITSAP COUNTY, WA

Island Lake County Park swimming beach temporarily closed due to high fecal bacteria

Avoid contact with water in the swimming area until further notice.

Kitsap Public Health District has temporarily closed the swimming beach at Island Lake County Park due to high levels of E. coli bacteria in the water. We will monitor water quality at the beach and will reopen the swimming area when bacteria return to a safer level.

Because there is an increased risk of getting sick, please avoid all contact with the water at the swimming area. This means no swimming, wading, or types of water play where water could be swallowed or get into your mouth, nose, or eyes. The risk of illness is greatest for young children, older adults, or anyone with a weakened immune system.

No illnesses have been reported to the Health District at this time. 

SWIMMING BEACH MONITORING

We monitor popular swimming areas for bacteria during the summer months. We also check for toxic cyanobacteria (blue-green algae) and other safety concerns. If people or animals become sick after being in the water, or if you see an algae bloom or large numbers of dead fish, please report it online or by calling 360-728-2235. We will investigate and take action if necessary.

High levels of bacteria can be caused by wildlife and pets in the water, people swimming when they are sick with diarrhea, crowded swimming areas, infants swimming without swim diapers, or people entering the water without showering. 

SAMPLING RESULTS

The closure level for E. coli is a geometric mean value (GMV) of 100 MPN/100 mL. For samples taken Tuesday, June 10 at the Island Lake County Park swimming beach, the GMV was 218 MPN/100 mL.

MPN/100mL is a unit of measure and stands for the "most probable number" of bacteria colonies that grow in a 100 milliliter sample.

RESOURCES

• Water Advisories | Kitsap Public Health
• Swimming Beach Monitoring | Kitsap Public Health
• Sign up for email and text alerts | Kitsap Public Health
• Recreational Water Illness | WA Dept. of Health

Tad Sooter |  Public Information Officer
Kitsap Public Health District
Office: 360-728-2330 |  Main: 360-728-2235
[email protected]  |  kitsappublichealth.org