I asked my water department for the concentration of calcium carbonate and I got the answer: 160 mgl.
After doing further research I have noticed that multiple measurements are expressed as CaCO3. Calcium and magnesium can both be expressed as CaCO3.
My questions are: Can total alkalinity be derived from that number? Is the number relevant to brewing or does Calcium Carbonate have to be referenced as an expression of another ion?
For reference here is the rest of the information they gave me:
Calcium 62 mgl, Calcium Carbonate 160 mgl, Chloride 20 mgl, Chloramine .5-1 mgl, Magnesium 70 mgl, Chlorine 1-2 mgl, Flouride 1-2 mgl, Iron .05 mgl, Manganese .02 mgl