Device types, FL DEP requirements, testing costs & county compliance guide
Florida law requires backflow prevention on all commercial connections and many residential services. Choose the right device for your application.
How it works: Two check valves separated by a pressure differential relief valve. If either check valve fails, water drains out the relief port rather than backflowing into potable supply. The only assembly that provides positive indication of failure.
Required in FL for: Irrigation systems with fertilizer injection (chemigation), car washes, medical/dental facilities, food service with spray equipment, industrial processes, fire sprinkler systems with antifreeze or additives, pools/spas with direct connections, boiler makeup water.
FL annual testing required: Yes β every 12 months. Must be tested by FL-certified backflow tester.
Installation notes: Must be installed above ground with 12" minimum clearance below. Cannot be installed in pit or below grade. FL Building Code requires 12" above 100-year flood elevation.
How it works: Two independently operating spring-loaded check valves in series. Approved for moderate-hazard applications where backpressure and back-siphonage are both possible. Does not have the pressure differential relief of an RPZ.
Required in FL for: Residential irrigation systems (non-chemigation), commercial cooling towers, multi-story buildings, supermarkets, hotels, apartment complexes, booster pump systems, commercial ice machines.
FL annual testing required: Yes β every 12 months for commercial. Residential DCVA testing required annually in most FL counties.
Installation advantage: Can be installed below grade in vault β preferred for residential landscape irrigation where appearance matters.
How it works: A spring-loaded poppet valve and an independently operating check valve. Protects against back-siphonage only (not backpressure). Must be installed at least 12 inches above the highest downstream outlet.
Approved in FL for: Residential lawn irrigation systems without chemical injection, hose connections, garden irrigation β the most common FL residential backflow device.
FL limitation: NOT approved for systems with chemigation (fertilizer injection) β RPZ required. NOT approved where backpressure can occur.
FL annual testing: Required in some FL counties β check local utility rules. Hillsborough, Orange, Miami-Dade require annual testing of residential PVBs.
How it works: Single float valve opens to atmosphere when pressure drops, breaking vacuum. Simplest and cheapest backflow device. Cannot be used under continuous pressure β must be installed downstream of last shutoff valve.
Approved in FL for: Individual hose bibs, lawn hose connections, laboratory faucets, clothes washer connections β point-of-use only. Not approved for whole-system protection.
FL note: AVBs do NOT require annual testing certification in FL. However, they must be inspected periodically and replaced if damaged. FL code requires AVB on all hose bibs in new construction.
| Application | FL Required Device |
|---|---|
| Residential irrigation (no chemicals) | PVB or DCVA |
| Irrigation with fertilizer injection | RPZ (mandatory) |
| Residential pool/spa (direct fill) | RPZ or DCVA |
| Commercial irrigation | DCVA or RPZ |
| Restaurant / food service | RPZ |
| Medical / dental facility | RPZ |
| Fire sprinkler (water only) | DCVA |
| Fire sprinkler (antifreeze) | RPZ |
| Car wash | RPZ |
| Hose bib connections | AVB |
| Apartment / multi-family | DCVA per unit |
| Cooling tower | RPZ |
Florida Administrative Code Rule 62-555 requires annual testing of all testable backflow prevention assemblies (RPZ and DCVA) connected to potable water supplies. Testing must be performed by a FL-certified backflow tester (state-certified under FL DEP or equivalent). Test reports must be submitted to the local water utility within 30 days of testing. Failure to test on time results in water service discontinuation notices in most FL counties.
Florida utilities are authorized to discontinue water service to properties with overdue backflow test reports. Miami-Dade Water and Sewer, Orange County Utilities, Hillsborough County Utilities, and most major FL water utilities have active enforcement programs. First notice is typically sent 30 days before test due date. Service disconnection typically occurs 60β90 days after overdue date in most FL counties.
FL-certified backflow prevention testers must hold certification from AWWA (American Water Works Association), ABPA (American Backflow Prevention Association), or equivalent FL DEP-recognized program. CPC-licensed plumbers may perform testing if they hold a separate backflow tester certification. The test involves gauging check valve differentials and relief valve performance using calibrated test kit. Test report is submitted to the utility on official form.
| County / Utility | Testing Deadline | Enforcement Level |
|---|---|---|
| Miami-Dade (MDWASD) | Annual β anniversary of install | High β active shutoffs |
| Broward County Utilities | Annual β Jan 1 deadline | High β shutoff notices |
| Palm Beach County | Annual β varies by utility | Medium-High |
| Orange County (OUC) | Annual β due JanβMar | High β active program |
| Hillsborough County | Annual β anniversary date | High β shutoff enforced |
| Pinellas County | Annual β Aug 31 deadline | Medium-High |
| Duval / JEA | Annual β varies by connection | Medium |
| Sarasota County | Annual β April 30 deadline | Medium-High |
| Collier County | Annual β varies by zone | Medium |
| Lee County | Annual β June 30 deadline | Medium |
| Brevard County | Annual β calendar year | Medium |
| Volusia County | Annual β varies by utility | Medium |
| Pasco County | Annual β Sept 30 deadline | Medium |
| Seminole County | Annual β varies by utility | Medium-High |
| Manatee County | Annual β Dec 31 deadline | Medium |
Contact your specific utility for exact due dates. Dates vary by account and installation date. Many utilities send annual reminders 60 days before due.
Most FL utilities will issue 30-day overdue notice, then 60-day final notice, then schedule service discontinuation. Reconnection fee typically $50β$200 plus compliance documentation. Commercial properties face business interruption risk.
FL DEP may assess civil penalties for willful non-compliance with cross-connection control requirements under FL Admin Code 62-555. Commercial properties with high-hazard connections at highest risk. DEP enforcement typically follows utility referral for chronic non-compliance.
Food service establishments, medical facilities, and other licensed commercial operations risk operating permit action from FL Department of Health if backflow compliance cannot be documented during inspection. FL DOH inspectors check backflow test records as part of routine inspection.
Property and general liability insurance policies may deny claims related to water contamination events if required backflow prevention was not in place or not tested. Document all annual testing with certificate copies stored on-premises and uploaded to utility portal.
FL-certified backflow testers on staff. Test reports submitted to utility same day. Emergency service available.