We first used Pratt when my mother-in-law on Camano Island had an infestation of wood ants in her attic. They cleaned that out and have prevented further infestations. We live in Woodinville and when we found that rats had gotten into our crawl space, we called Pratt and were happy to hear we were on the edge of their service area. They came out and took care of the entry points and set traps outside. We're no longer bothered by vermin.