What a backflow preventer does
It's a valve assembly that stops irrigation water from flowing backward into the public drinking water system. Irrigation water can carry fertilizer, pesticide and soil bacteria, so this matters.
How often it must be tested
For commercial properties in New Jersey: at least once a year, by a certified backflow tester. Your water supplier or town may send a notice with the due date. Ocean Township, for example, requires annual testing for commercial properties.
Who can test
Only a tester holding a current backflow tester certification. Results go to the water supplier and/or local authority.
Common device types
| Device | Where you'll see it |
|---|---|
| RPZ (reduced pressure zone) | Most common on commercial irrigation; above ground, often in an enclosure |
| DCVA (double check valve assembly) | Some lower-hazard systems; may be in a below-ground box |
| PVB (pressure vacuum breaker) | Smaller systems; must sit above the highest head |
If the device fails
- Don't panic — failures are common and usually fixable with a repair kit.
- Repair or replace the failed parts.
- Retest and file the passing result.
Protect it in winter
Most backflow failures we see in spring come from freeze damage. Make sure it's drained during winterization, and consider an insulated cover.
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