Anyone around here good at analyzing this stuff? Bethesda's water is provided by the Potomac tap, data for Potomac tap begins on the 5th page.
Just very generally here are the yearly averages.
GENERAL WATER QUALITY
Alkalinity mg/L 82
Color Units 0
Hardness mg/L 125
pH S.U. 7.4
Specific Conductance MicroSiemens/cm 354
Temperature º C 16.9