It is very unusual that a private well would have any chlorine in it. Where are you getting the test water from? Is there some kind of chlorine source in the well that's used for disinfection?

Also, can you have your well water tested independently? Well water is typically full of metals and the green color could be from copper or some other metal in the water. It could also be algae if the water in the well is stagnant. Do you use this well for house water or is it a secondary water source for the pool and landscape irrigation?