It's a 12 page report. Not sure what numbers exatly, but here's some that relate to hardness:
ALLOWABLE
CONCENTRATION MAXIMUM MINIMUM MEDIAN
(MCL, mg/L) (mg/L) (mg/L) (mg/L)
Chemical & Physical Parameters
Alkalinity, as CaCO3 ' NR 130 94 99
Carbon dioxide, free (calculated) NR...