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:07-29

  • 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 2020 is provided below.  A map of these sites is available and Historical information, from 2010 to 2019, is available.  A map that highlights the intensity of anoxic events across PEI from 2015 to 2019 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.

2020* Anoxic Events


  • Brackley Bay
  • Grand River
  • Hunter River
  • Hunter's Creek (Darnley Basin) 
  • Indian River
  • Mill Creek / Brown's Creek
  • Mill River
  • Montrose River
  • Oyster Creek (Foxley River)
  • Souris River
  • Southwest River (including Durant Creek, Harding Creek, Long River and Tuplin Creek)
  • Trout River (Coleman)
  • Trout/Stanley River (Granville Creek)
  • Wheatley River
  • Winter River

Freshwater Ponds:

  • Paynter's Pond

* Current to August 6, 2020

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: 
August 7, 2020
Environment, Energy and Climate Action

General Inquiries

Department of Environment, Energy and Climate Action
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