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FL Irrigation Backflow Guide

Backflow type finder, county rules, annual test scheduling & FDEP cross-connection

FDEP / FPC 2023 / FAC 62-555
🔍Find Your Required Backflow Preventer
Answer 4 questions — the tool will identify the correct backflow preventer type required by Florida law and your county's cross-connection control program.
📘FL Backflow Device Types — Quick Reference
AVB — Atmospheric Vacuum Breaker
Cheapest and simplest. Permitted only where the downstream system cannot be pressurized for more than 12 consecutive hours. Cannot be installed downstream of any shutoff valve. NOT acceptable for reclaimed water in FL.
LOW hazard only Simple residential
PVB — Pressure Vacuum Breaker
Most common for FL residential irrigation on potable water. Must be installed at least 12" above the highest downstream outlet. Requires annual testing. Acceptable where shutoff valves are downstream. Not allowed for reclaimed water.
Moderate hazard Standard FL residential
DC — Double Check Valve Assembly
Two independently operating check valves with test cocks and shutoffs. Good for below-grade installation. Acceptable for low-to-moderate hazard commercial irrigation. Not acceptable for reclaimed water or high hazard applications. Requires annual testing.
Low-moderate hazard Commercial irrigation
RP — Reduced Pressure Zone Backflow Preventer
Highest protection level. Required for all reclaimed water irrigation in FL (FAC 62-610). Also required for commercial potable irrigation in many FL counties and for any high-hazard connection. Must be installed above grade. Requires annual testing.
High hazard / reclaimed Reclaimed water required
🏛️County-by-County Irrigation Backflow Requirements
🌊FL Reclaimed Water — Statewide Rules (FAC 62-610)
RequirementRule
Backflow device requiredRP (Reduced Pressure) — statewide minimum per FAC 62-610.470
Cross-connection to potableStrictly prohibited — $10,000/day fine; must have physical separation
Meter colorPurple pipe, purple meter, purple valve tags — all reclaimed components must be purple-coded
Setback from wells75 ft from any potable well; 200 ft from Class I wells
Annual testRequired — certified backflow tester only (FL licensed CFC or CBC with backflow cert)
Signage"RECLAIMED WATER — DO NOT DRINK" signs required at point of use
FDEP permitReclaimed water use permits issued by FDEP for new connections to reclaimed mains
Responsible utilityLocal utility (SFWMD, SWFWMD, or other WMD) enforces cross-connection control
📋FDEP Cross-Connection Control — Key Rules
✅ FAC 62-555.360: All public water supply connections must have backflow protection as a condition of service. Utilities must maintain cross-connection control programs.

✅ FPC §608.16.5: Irrigation systems connected to potable water require backflow prevention at the connection point — either a PVB, DC, or RP depending on hazard level.

✅ FAC 62-610.470: All reclaimed water irrigation systems connected to potable water supply must have an RP-type backflow preventer.

⚠️ FDEP inspection authority: FDEP can inspect any potable water system at any time for cross-connection compliance. Non-compliant connections can result in service termination by the utility.

⚠️ Retrofit requirements: When a property connects to a new reclaimed water main, the existing backflow protection may need to be upgraded from PVB to RP — check with your local utility.
📅Annual Test Due Date Calculator
Florida cross-connection control programs typically require annual testing of PVB, DC, and RP backflow preventers. Enter your last test date to see your next due date and test urgency.
👷Certified Backflow Tester Requirements in FL
RequirementDetails
License typeFL-licensed CFC (Certified Florida Contractor) — Plumbing Division, or CBC (Certified Building Contractor) with backflow certification endorsement
Backflow certAWWA (American Water Works Assoc.) Level I or II backflow certification, or utility-approved equivalent
Test equipmentMust use calibrated differential pressure gauge kit; kit must be calibrated annually
Test reportWritten report required after each test — submitted to property owner AND to local utility's cross-connection control program
Failure actionIf device fails test — system must be shut off until device is repaired and re-tested; tester must document failure and corrective action
Repair restrictionsOnly the licensed plumber or certified backflow specialist may perform device repairs — homeowners cannot self-repair and self-certify
FL tip: Test reports must typically be submitted within 30 days of test completion to the local utility. Miami-Dade WASD, Broward County WD, and Palm Beach Water Utilities all have online portals where testers upload results directly. Keep copies of test reports for 3 years as proof of compliance.
❌Most Common Backflow Test Failures in FL
❌ PVB check valve fails to hold: FL's climate accelerates rubber seat degradation. PVBs in direct sun fail more often — cover with approved PVC housing. Replace seat and poppet annually if near saltwater.

❌ RP relief valve drips continuously: Means there's back-pressure higher than Zone 1 differential — often caused by irrigation head with stuck open zone valve or downstream check valve.

❌ PVB installed below top of highest sprinkler head: Most common installation error in FL — PVB must be 12" ABOVE the highest downstream outlet. Failed inspection instantly.

❌ AVB used where shutoff valve is downstream: Illegal in all scenarios where a zone valve or shutoff is downstream of the AVB. AVBs can only be used as the last device before the sprinkler.

❌ Device not accessible for testing: Backflow preventers must have 12" clearance above and 6" on each side. Devices buried in landscaping or enclosed in planters commonly fail inspection for access.
📞Free Backflow Inspection & Quote
Our FL-licensed CFC plumbers are certified backflow testers. We handle the test, the report, and the utility submission — plus installation or replacement if your device needs upgrading.
✅Our Backflow Services Include
✅ FL-licensed CFC plumbers — AWWA-certified backflow testers
✅ Annual test, written report, and utility submission
✅ PVB, DC, and RP installation & replacement
✅ Reclaimed water RP upgrades — permit + inspection
✅ Commercial multi-device backflow programs
✅ FDEP cross-connection compliance documentation
✅ Test failure repair — parts and re-test same day where possible
✅ 12-month service reminders for next annual test
We'll call you within 2 hours! 💧