01/16/2015 09:00 EST | Updated 03/18/2015 05:59 EDT

Longueuil contaminated water: how it happened

About 200,000 residents on Montreal’s South Shore were forbidden from drinking or cooking with their tap water for the about two days.

Following a spill of 28,000 litres of diesel into the Saint Lawrence River, City of Longueuil officials ordered a non-consumption advisory in the communities of Saint-Hubert, Vieux-Longueuil, Boucherville and Saint-Bruno-de-Montarville.

The spill happened after a pump generator leaked at a water filtration plant, spilling diesel into the ground and the river.

How did traces of diesel end up in people’s tap water?

Here is an interactive graphic that explains what happened. On mobile? Click here.

For a more in-depth understanding, watch CBC’s Jaela Bernstien report by clicking on the video.