Mount Pleasant Waterworks: backflow testing rules
Serves Mount Pleasant, SC. Every point below comes from Mount Pleasant Waterworks's own pages, linked; check your notice for your own deadline.
Who must test
- Backflow assemblies must be tested annually, and MPW may require more frequent testing depending on the degree of hazard. Source.
- MPW requires an approved backflow assembly on all irrigation systems, and only the reduced pressure principle assembly is allowed for lawn irrigation. Source.
- Existing fire service lines found without an SCDHEC approved backflow assembly must install one. Source.
Notices and deadlines
- Customers using an outside tester get a written test notice, then a Notice of Violation Final if MPW does not receive compliant results. Source.
How the report is filed
- Once a new device is installed and accepted, the customer has 15 days to provide satisfactory test results to MPW's Cross-Connection Control Department or service may be discontinued. Source.
Tester registration
- All backflow prevention assemblies must be tested by an SCDHEC Certified Backflow Prevention Tester, at the customer's expense. Source.
Fees
- Customers can enroll in MPW's Annual Backflow Testing Program, where MPW's certified tester does the test and a $50 annual fee is charged to the water and wastewater bill. Source.
If a test is missed
- If annual testing is not completed by the final notice date, water service is disconnected and a $65 fee is added to the bill. Source.
How to file your backflow test with Mount Pleasant Waterworks
- Read your notice. Customers using an outside tester get a written test notice, then a Notice of Violation Final if MPW does not receive compliant results.Source.
- Book a tester Mount Pleasant Waterworks accepts. See finding a tester below; book early so there is time to repair a failed assembly.
- The tester tests the assembly and fills in the test report. A failed assembly is repaired and tested again.
- The report is filed. Once a new device is installed and accepted, the customer has 15 days to provide satisfactory test results to MPW's Cross-Connection Control Department or service may be discontinued.Source.
- Fees. Customers can enroll in MPW's Annual Backflow Testing Program, where MPW's certified tester does the test and a $50 annual fee is charged to the water and wastewater bill. Source.
- Keep a copy and set a reminder for next year. Set a free test-due reminder.
Finding a tester Mount Pleasant Waterworks accepts
We found no tester list on Mount Pleasant Waterworks's own pages. Use a state certified tester, and check your notice in case it names the testers or the portal it accepts.
Before you book, ask the tester:
- Are you registered with Mount Pleasant Waterworks?
- Will you send the test report to the utility for me, and how?
- When is my report due? The date is on your notice; the tester needs time to test, repair if needed and file.
Other water utilities in South Carolina
- Greenville Water
- City of Columbia Water
- Charleston Water System
- Grand Strand Water and Sewer Authority
- Spartanburg Water
- Beaufort-Jasper Water and Sewer Authority
- Startex-Jackson-Wellford-Duncan Water District
- City of Florence
Read October 6, 2026. Program page: mountpleasantwaterworks.com.