There is a national lab that does some 83 different items within the water,, about 150.00
Then there might be a Sears store that might do it... or some other dealer in your area..
If it is city water then call the city for information of what is in the water.
Depending on the water test...
the 5600 non digital might be the simpler way to go... from what I have seen to many just do not get the programing chart that comes with the digital SXT..