City of St. Charles Water: backflow testing rules
Serves St. Charles, MO. Every point below comes from City of St. Charles Water's own pages, linked; check your notice for your own deadline.
Who must test
- Page speaks generally of home and business devices; no customer-type breakdown. Source.
Notices and deadlines
- A second letter follows if non-compliant, then a third from the City warning of shutoff. Source.
How the report is filed
- Bsionline.com; testing company support 800-414-4990, bsionline@backflow.com. Source.
Fees
- Fee is charged by BSI to testing companies. Source.
Program
- Program run for the city by third party BSI Online. Source.
Read October 6, 2026. Program page: stcharlescitymo.gov.