Success! I installed a new GE zwave outlet from Lowes this afternoon in my garage and fortunately the outlets in the kitchen were close enough to repeat the signal from the smart hub.
I found another post on the community with a similar question/answer for turning on an outlet when a switch is toggled:
Now I need to figure out the code to turn off the pump after a certain period of time, but no biggie on that since the major feature I needed is working.
Thanks again to all for the help! I am definitely enjoying SmartThings.