relief valve plumbing

I have a relief valve (75 psi) hooked near my pressure tank. I want to know if I can plumb it directly into the waste line. Someone told me that it may introduce bacteria into the potable water system.

I have a central drain located on the floor of the utility room several feet away from the pressure tank. I thought about running a small pipe across the floor and drill a hole into the drain grate and point it downwards. I also am going to have the pressure relief from the hot water heater hooked to this as well.

Any feedback?

thanks,
Scott

Most reliefs are piped outside, to an opensite drain or left about 6" off the floor.

drain

Connecting them to a drain, or hanging them into a floor drain, may never cause a problem, but it could. And if it did you would not be happy with the results. Do it correctly or do not do it at all.

To my knowledge it is allowed if you use an air gap with the end of the pipe at least 1" above the collection cup.... you would want a trap that stays wet to keep the sewer gas out of the house. Not really a good idea, too many other problems involved so it's really best to put it in a separate line to storm water drain or just outside on the ground.

The 1" air gap rule is correct. Just provide a funnel directly under the valves discharge and run the piping from the funnel, over to the floor drain as you originally wanted to do.The funnel can simply be a large reducing coupling.
For a 3/4" valve discharge, I usually use a 3x1 reducing coupling and then 1" pipe to the floor drain.
There are also floor drains available with funnel tops that will provide the air gap-but since yours is in the middle of the room, this would cause a trip hazard.

Yep... first time I saw an air gap I was wondering why they didn't have the drain hooked up!