Anoxic Events

Anoxic Event - New Glasgow - July 9, 2018

Anoxic events are a common occurrence in Island estuaries during the summer months.  The symptoms of an anoxic event include:

  • milky white or green discolouration of the water, 
  • H2S or 'rotten turnip' odour, and                        
  • low (near zero) dissolved oxygen readings.

A list of sites that have recorded anoxic events during 2019 is provided below.  A map of these sites is available and Historical information, from 2009 to 2018, is available.  A map that highlights the intensity of anoxic events across PEI from 2014 to 2018 is also provided.

Please note that information provided may not capture every anoxic estuary in PEI for a particular year. Some events may not have not been reported to or documented by the Department.

2019* Anoxic Events


  • Brackley Bay
  • Covehead Bay
  • Darnley Basin
  • French River
  • Mill River
  • Montague River
  • Souris River
  • Southwest River
  • Wheatley River


  • Paynter's Pond

* Current to October 9, 2019

Who can I contact for more information?

Cindy Crane
4th Floor, Jones Building
11 Kent Street
Charlottetown, PEI C1A 7N8
Telephone: (902) 368-5179
Fax: (902) 368-5830


Published date: 
November 4, 2019
Environment, Water and Climate Change

General Inquiries

Department of Environment, Water and Climate Change
4th Floor, Jones Building
11 Kent Street
PO Box 2000
Charlottetown, PE C1A 7N8

Phone: 902-368-5044
Toll-free: 1-866-368-5044
Fax: 902-368-5830
Report an Environmental Concern