This is easier than it seems. Just collect a sample in a clean (preferably new) container and find out where the nearest water analysis lab is and drop it off. They can, for a reasonable price usually, provide you with not only a complete list of anything they found in the water, but the actual concentration and its normal range for comparison purposes. Contractors of new construction relying on well water have to do this as part of the permit process.

Good luck.

Cathryn