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Probably a bit too neurotic. Hard water is generally not detrimental to poultry, unless it has extremely high levels of calcium. Water is considered "very hard" when it has over 180 ppm of calcium. Some literature I have read states that levels over 500 ppm may be detrimental to poultry, other literature says 1000 ppm. I doubt your well water has levels that high. Most wells drilled into limestone formations are going to have hard water, it is very common.
We have very hard well water and it hasn't caused any problems with our 2500 hens. It is hard on the equipment though. Every so often I have to use needle nose pliers to actually break away lime deposits that form on the watering nipples. We inject citric acid into the watering system every couple of weeks to help cut the deposits, similar to what people are doing with ACV. The birds like the slightly acidified water and it probably helps with intestinal parasites.