Overview of Backflow Prevention
Mount Pleasant Waterworks initiated a Cross-Connection Control Program in accordance with regulations from the South Carolina Department of Health and Environmental Control (SCDHEC). The program was initiated to safeguard public drinking water supply by preventing the water in a customer’s plumbing system from flowing back into the public water supply. The Commission requires all irrigation systems be fitted with a reduced pressure backflow prevention device. In addition:
- MPW inspects all businesses that sign up for service to determine if the installation of a backflow device will be required and if so, ensure that a secure, sufficient device is installed.
- MPW installs dual-check backflow devices (non-testable) on all residential home meters.
- MPW requires all customer with irrigation systems or fire sprinkler systems to install a backflow prevention device.
- MPW maintains records on all testable backflow devices to ensure they are tested annually and repaired when required.
What is backflow?
Backflow can occur when changes in water pressure create a suction effect, which can cause water to reverse flow, to backflow into the public supply.
Without barriers to prevent this, water from private plumbing systems, irrigation systems, pools, and other facilities, could flow into our public system and impact water quality.
That's why state and federal laws require water utilities to identify all connections to the public supply and have a program in place to prevent backflow. Mount Pleasant Waterworks does this by requiring customers whose water use presents a backflow hazard to install a backflow prevention device and have it tested annually.