At DSM Plumbing are Well and Well Pump service and repair Specialists! We do not install new wells! If you are experiencing issues with your well and or any components including your jet pump, foot valve, check valve, sump pump, pressure tank or pressure switch … Call Us and speak directly to an experienced licensed plumber! As fully licensed and insured expert plumbers in the Durham Region, DSM Plumbing is your number one choice for high quality plumbing services. We are a family-owned and operated company, and we are proud to offer up-front pricing on every job.