Backflow Preventer Testing in South Jersey
Annual certified backflow preventer testing required by New Jersey municipalities and water utilities. We test, repair, and replace backflow devices on irrigation systems across 7 South Jersey counties. Results filed directly with your water authority.
Certified Backflow Testing for NJ Irrigation Systems
Backflow preventer testing in South Jersey costs $75 to $150 per device for a standard residential irrigation system. The test takes 15 to 30 minutes and includes a certified report filed with your local water authority. If the device fails the test, repair costs typically range from $50 to $200 for internal rebuild kits, or $250 to $600 for complete replacement depending on the device type and size.
A backflow preventer is a mechanical device installed between your potable water supply and your irrigation system. Its purpose is to prevent irrigation water — which may contain fertilizer, pesticide, or soil bacteria — from flowing backwards into your drinking water supply. This reverse flow, called backflow or backsiphonage, can occur when water pressure drops due to a water main break, firefighting activity, or utility maintenance.
New Jersey requires backflow preventers on all irrigation systems connected to public water supplies. Most municipalities and water utilities in Gloucester, Camden, Burlington, Atlantic, Salem, Cumberland, and Cape May counties require annual testing by a certified tester to verify the device is functioning properly. Failure to test can result in fines, water shutoff notices, or both.
What Happens During a Backflow Test
A certified backflow test verifies that the internal check valves and relief valve in your backflow preventer are sealing properly and preventing contaminated water from entering the potable supply. Here is what our certified tester does:
- Visual inspection — Check the device for physical damage, corrosion, leaks, and proper installation. Verify test cocks are accessible and functioning.
- First check valve test — Attach a differential pressure gauge to the test cocks and verify the first check valve holds at least 1.0 PSI of differential pressure (for RPZ assemblies) or seals tight (for double-check assemblies).
- Second check valve test — Verify the second check valve holds the required differential pressure as a backup to the first check.
- Relief valve test (RPZ only) — Verify the relief valve opens when differential pressure drops below the minimum threshold, confirming it will dump water rather than allow backflow.
- Report filing — We complete the certified test report and file it directly with your local water authority. You receive a copy for your records.
Backflow Preventer Repair and Replacement
If your backflow preventer fails the annual test, we can repair or replace it during the same visit in most cases. Common failure modes include worn rubber check valve seats, stuck relief valves, and corroded internal springs. Most of these issues are resolved with a rebuild kit that costs $50 to $200 in parts plus labor.
Backflow preventers that have been damaged by freezing (from improper winterization), have cracked bronze housings, or are obsolete models that no longer pass code may need complete replacement. We install Watts and Wilkins backflow preventers — the industry standard brands that every NJ water authority accepts. Replacement costs range from $250 to $600 depending on pipe size and device type.
For systems that currently lack a backflow preventer (common on older installations), we install new devices and handle the initial registration with your water authority. This brings your system into compliance and protects your family's drinking water.
Backflow Testing FAQs
Yes. New Jersey's Safe Drinking Water Act requires backflow prevention on all cross-connections, including irrigation systems connected to public water supplies. Most NJ water utilities and municipalities require annual testing by a certified backflow tester. The specific requirements and filing deadlines vary by water authority, but failure to comply can result in fines, mandatory shutoff notices, or water service termination. We know the requirements for every water authority across our 7-county service area.
Most NJ water utilities require annual testing, typically due by a specific month each year (varies by utility). The best time to test is during your spring start-up so you know the device is working before the irrigation season begins. We can also test during winterization in the fall. We track your test due dates and send reminders so you never miss a deadline.
If the device fails, we diagnose the specific failure, provide a repair or replacement estimate on the spot, and can usually complete the repair during the same visit. After repair, we re-test the device and file the passing report with your water authority. Most failures are caused by worn internal parts that cost $50 to $200 to replace. If the entire device needs replacement, we install a new one the same day in most cases.
If your irrigation system is connected only to a private well (not to public water), a backflow preventer is generally not required by the water utility because there is no cross-connection to the public supply. However, if your system has any connection to municipal water — even a backup connection — a backflow preventer is required. Some municipalities also require them on well-fed systems as a local ordinance. We can assess your specific setup and advise whether testing is required.
Keep Your System Compliant and Protected
Spring Start-Up
Combine backflow testing with your spring start-up for efficient one-visit service.
Irrigation Repair
Fast repair service for all irrigation system components including backflow devices.
Maintenance Plans
Annual maintenance that includes backflow testing, seasonal start-up, and winterization.