Greater Cincinnati Water Works: backflow testing rules
Serves Cincinnati and Hamilton County area, OH. Every point below comes from Greater Cincinnati Water Works's own pages, linked; check your notice for your own deadline.
Who must test
- Backflow devices must be tested annually by a certified plumber or backflow tester per State regulations. Source.
- Common installations include commercial and industrial properties and properties served by irrigation systems. Source.
Notices and deadlines
- BSI Online (Backflow Solutions, Inc.) sends notifications, handles customer service inquiries and manages data for GCWW. Source.
How the report is filed
- Certified testers submit test results to BSI Online (bsionline.com). Source.
Tester registration
- There is no fee to register with BSI Online, but testers must submit copies of their credentials and test gauge calibration. Source.
Program
- Greater Cincinnati Water Works runs a Backflow Prevention Program to keep contaminants from being drawn through service lines into the water mains. Source.
Read October 6, 2026. Program page: cincinnati-oh.gov.