You can have your well water checked by your local water or health department, but be sure that they check it for all contaminates since in most cases they only test water to the degree that the organisms that it contains will cause harm to people. If you still suspect that your birds are being adversely affected by your well water you could install a UV water filtration system in the water line coming into your home. If you install the filter BEFORE the water heater, both the hot and cold water coming from every tap in your home will be completely free of any organisms that could harm you or your birds.
Another way to insure the quality of your bird’s drinking water would be to install a portable Reverse Osmosis (R/O) with a built in UV filtration system under the sink that you use to draw the water for your birds. This will provide you with cold filtered water only at that sink, but it is also a good way to give uncontaminated water to your birds.
I need to know how to make sure that my birds are getting clean water. I think that the water coming from my underground well may be contaminated? Help.