In Florida the water from a shallow well isn't as "filtered" as deep well water. But having said that the shallow well on the property here was used for all household uses, including drinking, for years before we put in a deep well. Shallow wells usually have more dissolved iron and calcium, causes the water to leave red rust and/or white stains. The real worry of using shallow well water is the risk of chemical contamination, but as long as you are having the water tested for that you should be fine.