We are at risk just waking up everyday (if you are that fortunate) but to run a tar sand pipeline anywhere near such a crucial water supply isn't a risk it's sheer stupidity with a little greed cherry on top.....There is a risk factor for everything. The alternative to a pipeline would be train or trucks. If the pipeline is underwater then ships are the alternative.
A lot of people live right over a pipeline or close to one. They don’t even know it.