The more remote a community, the more stressful something like a boil water advisory can be, precisely because of what the other witness mentioned—there's a lack of resources, and it takes a longer time to find solutions and resources. In particular, on average, first nations communities have less access to resources, have lower income and so may face additional challenges in those solutions, regardless of where they're located.
Never having lived in a first nations community, I would defer to the chiefs and other first nations members who have spoken to this committee about their experiences. To me, as a non-indigenous physician, the challenges seem much higher when you have that lack of resources, as well as the jurisdictional challenges they may face.