In the medical field or not, I would NEVER recommend going against what the city/county officials are advising. I can’t see how that would ever be a wise move. They may err on the side of caution and there may not be an issue but it’s a chance I would never be willing to take. In fact, even when they gave the all clear, I’d be the one drinking bottled water for a few more days.
A lot of people don’t realize how far these type problems can reach. Staying prepared for as much as we can is always the best plan.