The folks at Sprague do our regular pest control maintenance. They are good about coming regularly and they do a good job.
Our main problem has been carpenter ants, but when you need a nasty yellow jacket nest taken care of, they will do it.
They are environmentally sensitive to the extent you can be, so there are some spots where we don't spray but just watch for the big ants. BTW, this was a bad year, so keep on the look out. Carpenter ants are rampant in Seattle.