Backflow Testing Compliance Checker — St. Louis, MO
Pick your city or county to see the rules, who may test, where reports go, and which assembly each connection needs across the St. Louis metro and Metro East.
Your Compliance Status
Status
—
Next test due
Enter your last test month
Devices
1
Testing cost
$250
$250 per test — report filing included
Requirements for St. Louis County
- Water provider
- Missouri American Water (most of the county)
- Governing rules
- Missouri DNR 10 CSR 60-11.010 (cross-connection control); St. Louis County Plumbing Code (county permit & inspection)
- Test frequency
- At installation, after any repair or relocation, and at least once a year.
- Who can test
- Missouri DNR–certified backflow prevention assembly tester
- Report filing
- Test results filed with Missouri American Water, usually through its online tracking portal.
- Local note
- New or replaced assemblies need a St. Louis County plumbing permit and an initial test at install.
Assembly typically required
- DCVA typical; RP if provider requires containmentDomestic service — office, retail, school · Hazard: Low–moderate
Your water provider's notice sets the final device type and due date. Failed devices need repair and a retest before the report is filed. Want a yearly heads-up? Sign up for a backflow reminder.
Conceptual estimate only — not a bid or quote. Actual cost depends on site conditions, access, code requirements and material pricing. Legacy Plumbing will confirm scope and pricing in writing.
More Plumbing Calculators
Construction Budget Estimator
Conceptual plumbing budget for tenant finish and ground-up commercial work.
Service Call Estimator
Typical price ranges for common commercial service and repair calls.
Residential Quote Builder
Homeowners: pick the job, materials and hours, then download a PDF quote.
Water Heater Sizing Calculator
Peak demand, storage and BTU input for your building type.
All Tools
See every Legacy Plumbing calculator.