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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
I assume this is the water heater drain. Most likely it is leaking either from the heat in the tank raising the pressure or the plug threads are worn, or the plug needs some teflon tape. Do make sure the hot water is not getting to hot from a faulty thermostat. You can leave the kichen faucet on a low steady stream to help reduce the pressure for now. Another possible cause is your fresh water in pressure reducer is bad and the pressure on the system is to high.
Thanks for using Just Answer, and rating me so I am compensated, Chris
Hello again Chris here,