The Mosquito and Vector Control Department is a FREE service of Marin and Sonoma Counties. They will come to your home and remove yellow jacket nests in the ground for free and advise you on how to control rats or mice. They also deal with mosquitos, ticks and all kinds of pests. Their website contains a wealth of information, including several downloadable brochures. Very knowledgeable folks and I’ve called them often. (800) 231-3236.