I live in Cornelius, got this from an engineer at the water company. I don't do a lot when I brew, just charcoal filter for chlorine and balance for style, mostly gypsum. I also have some other notes from the guys near the city if you want.
Analysis for Lake Norman:
Property Nominal Raw Water
Specific Conductivity 65 micro ohms/cm
Temperature, degrees. F 46 to 89
Silica (as SiO2), reactive 4.2 to 8.8 mg/l
Turbidity, NTU 0.5 to 5.3
Alkalinity, CaCO3 15 ppm
TDS 50 mg/l
Chloride (as C1) 3 to 12 mg/l
Free Chlorine 0.5-2.0 ppm
Sulfate (as SO4) 3.3 to 16 mg/l
Sodium (as Na+) 4.6 to 8.1 mg/l
TOC 2 ppm
Calcium (as Ca ++) 1.9 to 5.4 mg/l
Magnesium (as Mg ++) 1.2 to 2.7 mg/l
Aluminum 0.05 to 0.15 mg/l
pH 6.0 to 7.0
Calcium (as Ca ++) 1.9 to 5.4 mg/l
Magnesium (as Mg ++) 1.2 to 2.7 mg/l
Chloride (as C1-) 3 to 12 mg/l
Sulfate (as SO4 --) 3.3 to 16 mg/l
Sodium (as Na+) 4.6 to 8.1 mg/l