I bit the $16.50 bullet and sent a sample in and here's what I got. So...what do I have?
pH 8.2
Total Dissolved Solids (TDS) Est 230
Electrical Conductivity, mmho/cm 0.38
Cations / Anions, me/L 3.7 / 3.7
ppm
Sodium, Na 18
Potassium, K 5
Calcium, Ca 32
Magnesium, Mg 14
Total Hardness, CaCO3 138
Nitrate, NO3-N 0.4 (SAFE)
Sulfate, SO4-S 8
Chloride, Cl 22
Carbonate, CO3 6
Bicarbonate, HCO3 140
Total Alkalinity, CaCO3 125