Most houses are built with two water disposal systems. One, the drains in the floor and the gutters are routed to the storm drain system. The other, the waste water from toilets and sink drains is routed to the waste water (sewer drain) system or the septic tank. These two are not connected in most city utilities systems and I haven't seen a septic system that connects to a garage floor drain.
Before you consider this, I'd check carefully to be sure that the garage floor drain is, in fact, connected to the sewer disposal system. If it's not, and if it's connected to the storm drainage system, or worse yet, routed outside the house via a 4" perforated drain line, that's designed to "perc the water into the ground", you could be in for some pretty stiff "legal maneuvering" to get out of the issues created.
Do a lot of checking and double-checking before you move forward with this plan. Besides, even if it is feasible, you're going to require some way to flush the waste far enough past the floor drain so it doesn't "linger" in the garage. And then there's the "hose drippings" that will be on the floor as you disconnect after use. What if you should happen to have a hose rupture? Hmmmmm
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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