Coy's Plumbing WA At Coy’s Plumbing, we utilize modern equipment to fix and install your plumbing, but we operate our business on old-fashioned principles. If we can’t fix your plumbing problem, you don’t pay us a dime. Phone: 509-786-4319 130 W. Nunn Rd, Prosser, WA 99350 United States Map Other Categories: House & Home |