I'm using a Radio Shack Pro-163, and I'm not far from downtown. I'm getting a 99% decode on the control channel and I was getting several TG's from FWPD and some water treatment plant in the brief few moments I monitored it.
I'll double check everything when I get back... I'm stuck in Oklahoma for the night
The only water treatment talkgroup normally active on this system is 1616, Village Creek Waste Water Treatment Plant
The other Ft W/Tarrant County
system backs up the public safety one, but has only one transmit location near downtown. Hopefully, that's not overloading your scanner.
As I don't have a 163 (or one of it's related models) to check personally, the only other thing that comes to mind is that the scan list, for the Ft W/TC bank, which contains the Ft W FD talkgroups got accidentally locked out. I was over in Coppell, near DFW Airport, and put my 396XT on system hold for this TRS. It was not a real busy afternoon, but I was hearing normal traffic, from the initial dispatch, to units checking en-route, and later clearing. At home, except for a couple of scanners on rooftop antennas, I'm basically out of range of this system; just too weak, regardless of which scanner.