Growing up on a ranch I have killed tens of thousands of gophers using various methods. In the city I would not use poison. Too much risk involved. Besides poison is usually only used when populations are out of control and you need to kill hundreds of gophers. From what I understand your dealing with just one family? You can simply snare them like another poster mentioned. Or get a small leg trap and put it just down the hole so they have to step in it to leave the hole. Only problem is you are going to have to kill them yourself once you catch them. When I trapped gophers as a child I would just step on their heads. Its hard to do the first time you do it. But after a while you will become a heartless killer like Cowperson.
I guess if you do snare them, you could put them in a container and relocate them. If you don't have the stomach to bash their brains in. You could try some of the other methods mentioned in this thread, but they may or may not work. Snaring or trapping will remove them immediately.
__________________
|