Can try Clorox if that worked for Raccoon's, or get a Haveahart trap and try trapping him and set him free in a remote area. They can be tricky to trap I hear, so will need to wash the trap and use rubber gloves to keep the human scent off, make sure the trap is on stable flat surface or they wont go in.
Or if all else fails and he is actually destroying your garden you can always give him lead poisoning via a good Pellet Rifle (airgun) which is the preferred "lethal" method Vs gassing or lethal type traps.

Check with your animal control agency. They may have Hav-a-heart traps you can 'rent' from them. And perhaps they'll pick up the groundhog once trapped. Good luck!

Note that animal control will generally kill the animal not release it.

There is one under my neighbors shed, and he has yet to mess with my garden. scares the crap out of me from time to time though...

Also some places frown on transporting wildlife and releasing it. The county might be able to suggest a trapper.
Lead poisoning.

There are services that trap and remove problem wildlife. Drscott is right, though, many places don't permit relocation - just humane euthanasia.

Actually, you can encourage them to find a new home by pouring something highly aromatic and persistent down the hole -- get a piece of hose, a funnel, and something along the lines of a bottle of cologne or perhaps some cleaning product like PineSol, and pour it down there. That should encourage him to move on. Years ago, we used to use gasoline or kerosene, but that clearly would be a big contamination threat to the groundwater.

If you want to live trap, I'd suggest getting some "Groundhog Heaven" scent bait, I was never able to get them to go into my traps until I found this product. It works. And it's cheap, I've been working off the same 4 ounce bottle for 4 seasons now, and it's only half gone. $6.50 plus shipping (around $6 also IIRC).

Here is a link that might be useful: Groundhog Heaven scent bait

Woodchucks can be incredibly persistent once they discover food or shelter. If you're somewhere residential, I doubt you can shoot it. I have had mixed success trapping in havahart traps, caught two young ones, never had the older ones go into the trap. For me, the dog finally worked. Otherwise, animal control or maybe one of those smoke bombs you drop down the hole, but I think for those to work you need to find and block all alternate exits? Anyhow, good luck!

I heard that keeping a radio on in the area will drive away skunks, don't know if it would work with groundhogs, though. Might be worth a try.

Hey Dennis, I see we were posting at the same time, funny. Thanks for the link to the scent stuff, there is the occassional young one that gets under my porch and I don't like to send the dog after it because of the flower beds. An irresistable lure for the trap would help things along faster.

I've successfully used the bombs. Make sure you find the large ones. You have to block off all exits. I've placed large rocks at exits, put the bomb in the hole and immediately blocked that exit off with a rock. Wherever the smoke eeks, I plug with wet rags. Good luck. In my opinion, the most destructive and difficult pest!

Well, score one for the dog! There was one in the middle of the yard and she dispatched it fairly quickly. I guess the young are starting to disperse now.

I had 2 last year and had no trouble trapping them. They tend to stick to walking along a "line" meaning along a fence or protected cover, so I put the trap along the fence and caught both within a couple days. I baited the trap with sliced apples. They are out in the early morning and evening. Good luck, once they find your garden, they'll mow it down! I hope you can get rid of them asap!

Youve got to admit they are pretty cute though... :)

Concur with Michelelc's post. Once I have identified a ground hog - before or after it has caused damage - it is usually easy to trap. My favorite bait is dried apricots; they have an irresistible scent, and don't turn to mush if it rains.

It helps if you trap the adults as soon as they move in, before they have established deep burrows or had their first brood. I place the trap along a run, near their burrow, or near to the place where they have dug under my garden fence.

{{gwi:12013}}

I love wild critters, but having had ground hogs ravage my garden several times, I don't catch & release. I released the first one I caught in a rural area, but upon reflection, decided it wasn't right to make my problem someone elses. Now I dispatch them humanely.

I call it the ambiguity of the garden. For example, a real conversation with my husband one day:
Me: "Damn deer, stay away from my @$&*# garden!"
(10 minutes later, leaving our very long driveway)
Me: "Oh, look! Deer! And a baby, aren't they beautiful!"
(small pause)
Husband: "Aren't those the same deer you just chased out of the yard?"
Me: "Well, probably, but they are pretty down here."

I forgot to mention, if you do decide to use a trap, don't leave it open overnight. Groundhogs are out early in the morning and late in the afternoon/evening, so I would set my alarm for 6am, go out and open the trap, then close it before dark. I learned the hard way that you will catch things you don't want to catch if you leave the trap open overnight. I got a skunk the first night I put the trap out. Luckily, I had a brave friend who wasn't afraid to open the door to let the skunk out. The trap was quite small (I thought at the time it was something small eating my garden), so the skunk was crammed into the trap and couldn't lift it's tail. I then got good advice here to just leave the trap open during the day. I also got a bigger trap when I saw the groundhog in my garden! He wasn't fitting in the little trap.

1) Bought Trap baited with 2 apple halfs coated with peaut butter
2) Within 1/2 hour squirrels stole 1 piece
3) This morning caught squirrel
4) Nearly had heart attack releasing squirrel
5) Shouldnt that trap have some kind of quick release?

Lesson learned squirels are scary when corned.
Got me to thinking- ground hogs are bigger than squirrels...hmmm?

Me mountain man!

Pictures

Yup, GH are a bit bigger than squirrels. But that's a fine looking squirrel. :) Oh, and if you plan on trap and relocation, put something disposable under the trap for the car trip, because nothing smells quite like GH poop. Good luck!

I was concerned when I saw a groundhog setting up house in a culvert on my neighbor's place, but I haven't seen it lately. Then, the other day, I saw a mama raccoon there. Which isn't altogether good, either.

The most effective way of dealing with groundhogs are German Shepherds :-)

My mother had success with pepper PELLETS (CritterRidder)

NB: pepper pellets do not work on squirrels. Alas