[TMSuchman]

There are a couple of ways that I use;

1] a .22 cal rifle with subsonic rounds. [These do not have a loud report to upset the neighbors]

2] fill hole with used kitty litter. The smell of cats & their urine drives them away, and they do not return....

[Vigilanteman]

Groundhogs are a real pain in the rear. Years ago, when I lived by a river, they would dig holes in the dike. Our babies were still in diapers then, so I would tamp their holes full of disposable diapers. They would dig holes elsewhere. I found the one live trap bait they couldn't resist was apples. We'd catch them and they'd often die in the summer heat before we could get to the traps. Otherwise, we'd drown them and feed the carcass to the cats.

Our cats were good hunters, but the groundhogs were smart enough to steer clear when cats were in the vicinity. It was a neverending battle just defending our garden and dikes from groundhog destruction. I probably killed 10-12 of them every year, but new ones would just keep moving in.