The Health of the Lake

Since 2001, there has been a systematic monitoring of fecal coliform levels for all five beaches. Since 2007, samples for the analysis of phosphorus levels were also taken on a regular basis. As part of its participation in the Lake monitoring volunteers network, the association also conducts tests on water transparency. This is easy to measure and is useful in showing long-term changes in water quality and lake condition.

As you will notice in the results below, despite its clearness and acceptable water quality, the health of the lake remains fragile.

Lac Doré has faced a few problems related to cyanobacterial blooms in recent years. In order to be aware of what actions to take and priorities to ensure the preservation of the health of Lac Doré, Abrinord has produced a summary on the state of its watershed.

The summary (April 2016) includes the important and available information on Lac Doré. It will be used, among other uses, as a guide in decision-making with respect to actions to take to slow down eutrophication (premature aging) of the lake.

Click here to view the Summary-report of Lac Doré (in french only).

Water Tests Results

WATER QUALITY TEST (PHOSPHORUS AND FECAL COLIFORMS)

 

Results of water quality from RSVL for lac Doré - Site RSVL

Water quality  2019 - Information on the quality of the water 2019

2018 report on the health of the lake : 2018 report

RSVL results :  2017 RSVL Report   2016 RSVL Report

In summer 2011, a first occurrence of cyanobacterial blooms (also called blue-green algae) was observed in the lake. These events were repeated in 2012, 2013 and 2015* (*cases not reported to the Ministry ). In 2011, when the the first bloom had appeared (was identified), phosphorus levels reached a concentration of 9 mg/m3 (June 2011). In September 2013, phosphorus concentration increased to 13 mg/m3. These concentrations are at the limit for an acceptable level for the lake. Phosphorus presence is not as a result of rain water, but comes from fertilizers used on lawns and flowerbeds of lakeside and non- lakeside residences." - Excerpt from the 2015 report on the health of Lac Doré from Roger Tessier, environmental consultant.

"Based on results, Lac Doré shows little or no signs of eutrophication. This lake must be protected. To maintain its state and uses, the MDDELCC recommends the adoption of preventive measures that implicate limiting feed compounds. " - 2015 RSVL Report

LÉGENDE

RESULTS OF PHYSICAL AND CHEMICAL TESTS - Carried out as part of the RSVL

Phosphorus test results prior to 2015 are shown in the following table

FECAL COLIFORMS AND PHOSPHORUS (prior to 2015)

Fecal Coliforms/100 ml

WATER TRANSPARENCY TEST

An estimate of the average water clearness was obtained through 8 measurements of the Secchi disk depth in the summer of 2015. This transparency of 7.2 meters equates to very clear water. However, in 2009, the average was 7.4 meters, a loss of 0.4 meters in transparency. The measurements in coming years will provide more info on this variable.

Source : Rapport RSVL 2014

RSVL RESULTS 2015

Comment agir pour protéger la qualité du lac.

CONTACT

Courriel

association.lacdore@gmail.com

 

Adresse postale

Association des propriétaires du lac Doré

CP 604 Val-Morin BDP

Val-Morin, QC, J0T 2R0

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