If the people you are buying the property from have not had the water tested in over a year consider getting it tested your self. Water content can change over time. You can't really go by how the water tastes since some water can taste great but still be contaminated. A shallow well can be more of a problem than a deeper one but it's always best to have the water tested to be safe.
We once lived in an area that had such a high mineral content that the water would actually turn the shower a different color. It was awful. I couldn't live like that even with a water softener. |