BBQ_Pork... welcome...one YouTube channel I like to watch is "LDS Prepper" and he has a pretty good rainwater collection system, but I especially like his dump system to divert the initial run off away from the collection tanks... I live in an old Florida residential community with no heavy industry, and other than lawn maintenance, not too much ground water pollution..my shallow well is 25' and that is my supply...my concern for your location is when our Chinese friends decide to test something out in Lop Nor (Lop Nur) you get a bit of it a couple of days later... not that they would test in the atmosphere..