The Grey Bruce Health Unit advises beach water sampling has identified higher levels of bacterial contamination at Little River Park in Thornbury.
The Health Unit says the levels are in excess of Ministry of Health standards and swimming in the water may pose a risk.
“Bathers are reminded to avoid swimming after heavy rain or in cloudy water,” a health unit release explains.
Resampling of the beach water will be done next week to determine the safety of using the beach again.
The Grey Bruce Health Unit says it has been in contact with the Town of The Blue Mountains and the situation will be monitored closely to ensure the safety of residents.