Metering

The water from irrigation comes from retention ponds which contain water from runoff or from wells, in achieving option 1 whole building metering, would just building metering be adquate as no potable water is used for the grounds? For option 2, as I said we have submetering on the cooling tower but I would also like to obtain the IO credit for having another submeter. If I submeter my irrigation supply (non-potable water) would that count? On page 93 of the Ref. Guide 2nd last paragraph it states "meters must measure potable water use, but gray or reclaimed water use may also be measured to meet the requirements of this credit." If someone could shed some light on this I would greatly appreciate it. Thanks in advance.

I just want to verify as the wording is not extremely clear within the reference guide. I will read/record the building's city potable water supply meter and record our consumption one day per week. This credit at first seems to only be concerned with potable water consumption. I will also view the building cooler tower submeter and record the number one day per week. We are currently in the stages of installing submeters on our irrigation water which is non-potable but will still give us the one IO point for this credit? For the WHOLE BUILDING metering I will only worry about the potable water consumption and ignore the irrigation water meter, thus the whole building water consumption will exclude irrigation consumption.