If you have been using this water for the past five (5) years and your predecessor's in interest to your property have done so for years before under claim of right then there is a very good chance that a claim for a "prescriptive" easement for the use of the spring water has arisen over time allowing for the continued use of the spring water in the future assuming there is no recorded easement as to it.Assuming the water literally flows through your property you have the right to use it no matter what under the laws of all states in this country. I suggest that you may want to discuss this matter further with a local real estate attorney.