Swimming Advisory for Mark's Bay South

Thu, Jul 02, 2026

 

Algoma Public Health (APH) has issued a swimming advisory for Mark’s Bay South located in Sault Ste. Marie, Ontario. Water samples are taken from Mark’s Bay South every week.  The test results of samples taken on Monday, June 29th, 2026, contained high levels of bacteria.  It is unsafe to swim at beaches with increased levels of bacteria.  When sample results return to safe levels, the advisory will be removed.  

Weather may affect water quality.  Water may contain high levels of bacteria for up to 48 hours following heavy rainfall, high winds, or increased number of birds.  

Swimming advisories do not close the beach or stop people from swimming. They let swimmers know about the water conditions the day the sample was taken.  Swimming in water with high levels of bacteria can cause skin, eye, nose and throat infections, as well as stomach illness if water is swallowed.

To reduce your risk: 

• Avoid swallowing beach water
• Towel off after a swim, and
• Shower once at home
  
  

Visit our website to view a map of the beaches sampled and current warnings or postings:

https://www.algomapublichealth.com/environment-inspections/recreational-water/beach-warnings/