Septic Installations

Septic tank installations near water courses represent a potential source of contamination. Solutions adapted to each context must be studied and implemented according to the risk factor involved, the technological possibilities and the costs of placing it in the ground and operating it.  

In 2009, RBL carried out an exhaustive study of septic installations on the Ville de Lac-Brome territory. This study revealed the following:

1. 1682 individual residential installations, excluding sealed tanks, were 100% used on the  Ville de Lac-Brome territory;

2. Of this number, 776 septic installations (46.1%) are situated in the watershed; they possibly have an impact;

3. The MDDEP considers an individual septic installation to be “neutral” if it is more than 300 metres away from a body of water. It is estimated that on the  Ville de Lac-Brome territory,  more than 80% of the properties are located less than 300 metres from a body of water; 

4. 249 isolated residential septic installations are found along the shoreline (of 403 lakeside properties excluding businesses); the other shoreline properties are served by the municipal sewage system, mainly in the town of Knowlton itself. Of these 249 installations, 70.7% do not respect the minimum surface required by the law (4,000 m² for any building less than 100 metres from the lake). 

Concrete proposals were formulated to be presented to all citizens encouraging them to keep their septic installation well maintained and used. Other than these elementary precautions, precise recommendations were sent to Ville de Lac-Brome for such sectors as Fisher Point, the sector north of chemin Lakeside, the village of Foster and the Rock Island Bay sector.

In its 2011 strategic development plan, Ville de Lac Brome states that it will conduct feasibility studies on the sewage systems in the Foster and Rock Island Bay sectors.




New:  Quebec adopted a new tax credit in the 2017 budget which refunds 20% of the cost exceeding $2,500 when an existing septic system is brought up to code.  (Note that this credit is “refundable” which means that it can be paid even if the property owner does not have provincial tax to pay.)  For more details, consult the link below. 


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