Generally it is a good idea to test for total coliform bacteria, nitrates, pH and total dissolved solids (salts).  These are the basics to test, unless there is a known issue with other parameters.  Because there is likely to be someone try to drink it, the water test is compared to the drinking water standards.   See the information below on how each parameter may shape up.  A few of the standards have a livestock rating, too.


This is our library of information on water testing.