What Is Backflow Prevention, and Why Does It Matter?

Backflow prevention devices exist to stop contaminated water from flowing backward into the clean municipal water supply — a real risk anywhere an irrigation system, pool, or commercial line connects to the water main. Most municipalities across Broward, Palm Beach, and Miami-Dade Counties require an annual test of these devices, usually performed by a certified tester, with results reported to the local water authority.

If your device fails its annual test, you'll typically have a set window to get it repaired or replaced and re-tested before it's flagged as a violation — see backflow repair & replacement for that. If you're not sure whether your property even has a backflow device or when it's due for testing, that's worth confirming before a routine test turns into a compliance issue.