It is estimated that a large portion of the sewer network maintenance requests received by the City comes from problems associated with an accumulation of edible oils in the sewers, especially greases and fats.
This situation occurs when oils are poured down a sink or toilet. Although it may be liquid when poured, it changes when cooled after heating. The result: the oil congeals and adheres to the walls of the pipes, causing major obstructions.
In addition to the risk of sewer backup into the basements of neighbourhood homes, these clotted materials generate additional maintenance costs for the municipality. In fact, to prevent blockages, the City cleans the most problematic sewer pipes once every month, and cleans each and every pipe smaller than 500mm (half a metre) once a year. In addition, obstructions caused by edible oil accumulation increase the costs of wastewater treatment, since the amount of contamination necessitates more complex sewage treatment.
There are other alternatives to pouring oil down the sink or the toilet:
- Ecocentres: liquid cooking oils are accepted at the Saint-Bruno and Grande-Allée centres (during the summer, from April 1 to October 31). There, the oil is deposited into Laurentides Re-Sources containers for recycling.
- Another solution:
- For large quantities: Refrigerate the oil in an airtight container (yogurt container, plastic bottle, etc.) to cool and solidify it, then discard the full container in your household garbage.
- For small quantities: Refrigerate the oil in a container to cool and solidify it, then scrape out the contents and discard it in the garbage.
- Important: Wait until the oil has cooled before handling it and throwing it out with the household garbage.