Quote: Yes not all well water is equal. Some have harder water than others. Ours was tested for very high mineral and salt content and was definitely the issue in my flock.
Here is a map of the hard water in this country...
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If you live in that soft area as I believe you do, you shouldn't have a problem. Unfortunately I am in that bright red area. I mean you can cut the water with a chainsaw! Ha! We drank this water for 5 years and only stopped because it did make tea and coffee taste a bit off. However birds are very suseptable to salts and minerals. Unlike Sea birds, which actually have a salt gland, birds have a difficult time clearing salt from their bodies like most mammals. So they are very open to salt and mineral poisoning. I would say if you don't live in any of those blue areas, you need to add a filter or purchase water.