Backflow Prevention

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As a Dorchester County Water and Sewer customer you expect pure and healthy drinking water. Our program is designed to help identify and prevent cross-connections.

Our customers also have a responsibility to help keep the public water supply safe. To avoid contamination, backflow preventers are required whenever there is an actual or potential hazard for a cross-connection.

Backflow preventers are mechanical check valves with springs and rubber parts. These parts will fail to work properly on occasion due to age, use and debris caught under the sealing surface of the valves. 

  • Annual tests by a certified tester are required to help ensure the device is working and is part of Dorchester County’s Backflow Program. Click for a list of certified testers.
  • Residential and commercial customers will be notified annually by mail of this requirement. 
  • Certified testers will be required to complete the Backflow Test Report Form and return to the Department.

For more information contact the Dorchester County Water and Sewer Department at be 843-832-0185 or 843-563-0185 and ask for backflow prevention.

 SCDHEC - Cross Connection Control and Backflow Prevention


Commercial Backflow Preventor

Residential Backflow Preventor

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