Serenity ~ What we have ended up doing is: testing TDS, pH, and temp ourselves using little devices we purchased from Amazon/Ebay. The local health dept. will test the e.coli and contaminants of each spring (I assume any health dept. would do this for you).
I've also learned that if there is "life" in the spring - it's usually a very good sign of pure water (frogspawn, etc) as well as a temp. of 36-40 degrees F.
We have located nearly six springs around the property thus far, so I feel like we're getting pretty good at this water testing stuff
Best to ya!