Bookmark and Share


The primary focus of the Lac St-Pierre Association is the quality of the water in the lake.

We all need to recognize the direct linkage between property values and the quality of the lake water. The quality of our water is directly linked to the collaborative efforts of all property owners. Therefore, our primary focus over the next year or two is to connect/reconnect with all the property owners to get them to join our collaborative efforts in managing (i.e., safeguarding and improving) the quality of our lake water. sd

The water in our lake is tested at least once per year using the Reynolds Protocol. These tests include clarity, phosphorus and fecal coliform.

For clarity & phosphorus, the following Table is used for classification purposes:

Readings :
Lake Can be Classified as:
Total Phosphorus: less than 0.010 mg/L
Secchi Disk Reading 5.0m or over
Oligotrophic: clear water with very low levels of phosphorus, algae and nutrients
Total Phosphorus: 0.010 to 0.020 mg/L Secchi Disk Reading 3.0m to 4.9m.
Mesotrophic: moderately clear water with moderate levels of phosphorus, algae and nutrients.
Total Phosphorus over 0.020 mg/L Secchi Disk Reading less than 3m.
Eutrophic: very low water clarity with high of phosphorus, algae and nutrients


For fecal coliform, the following standards are used:

Parts per 100 ml
Rating for swimming
0 - 20
Excellent
21 - 100
Good
100 - 200
Mediocre
200 +
Not fit for swimming



Total Phosphorus Test Results for Lac St-Pierre 2007 - 2017

Updated 2017 water quality report for lac St-Pierre from the Fédération des Lacs

E-coli Test Results for Lac St-Pierre 2008

E-coli Test Results for Lac St-Pierre 2009

Water Quality Report (2015) - Lake McMullin

Water Quality report (2015) - Lake St-Pierre

Characterisation and extent of watermilfoil in Lac St-Pierre (in French)