babsbag
Herd Master
Sorry. For me personally I wouldn't buy a property that had a well that didn't have potable water. I know people that are always having to truck in water because their property doesn't provide potable water. I would always have the water tested before purchasing a property.
A huge part of the country land in CA is on well water, a even bigger part of our agriculture in on well water. Testing a well prior to buying land is smart but most bare land will not have a well but honestly I don't know of anyone on well water in our county that has non potable water. More of a concern is having soil that will "perk" so a septic system can be installed. I wouldn't be too worried about contaminated ground water in CA, but then I have the benefit of knowing that since I live here and I am familiar with the areas the OP is looking at. Right now I would rather have my well and police myself than have a water district breathing down my neck if I water a flower or a tree.