yep utility says i am on the hook for it

SO how tuff is it to fix this?

Its in a 6" diameter PVC tube about 18" below ground. So I will have to
dig a hole around it to work.

Is this a threaded coupling on each side of the valve or what?

I am fairly handy and have done a lot of other home repair and
carpentry stuff - not alot of plumbing though (just replaced 2 outside
faucets which led to this problem),. So is this something I could do
myself or leave it to the pros?