Hope it rains and get your tarps and containers out.

If you're talking about your home area, contact your local Water Board and ask them what kinds of contaminants are in the local water (they know). Then ask what would be the best, least complicated way to deal with them in a major disaster situation.

Use the info now that is already available. Waiting until a problem erupts and then guessing on how to deal with it would seem to be the height of poor planning.

Sue