The better question is WHERE is the G-Round... frank
Here it is-the white wire (maybe 18 awg) running across the top of the cast drain line and sorta wrapped around the pipe strap-yes it is attached to the ground wire (only piece of NM with a ground I could find). Unfortunately, this "ground" is less than useless, since there is a repair consisting of about 36" of PVC in the cast drain line just above the floor. Any fault to this EGC would merely result in energizing every metallic plumbed drain in the house. Shower anyone?