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NEED A LICENSED MASTER PLUMBER IN YOUR AREA. This site is dedicated to those who protect our nations health Toggle menu Welcome to the Washington Suburban Master Plumbers Association website. This site is dedicated to those who protect our nations healthThe Plumbers. Dedicated to Health and Sanitation26712 Howard Chapel DriveDamascus Maryland 208723014667747Proudly serving Montgomery andPrince Georges Countiesin Maryland Washington Suburban Master Plumbers Association was founded in 1938 and has served the Master plumbers in the Washington Metro area since its beginning.