Irrigation Backflow, Backflow Preventers & Deduct Meters in Southern NH
Irrigation backflow installation, annual backflow testing, RPZ and double-check valve assemblies, and deduct meters to lower your sewer bill. Installed by licensed NH master plumbers across Southern NH.
Protecting Your Drinking Water & Lowering Your Sewer Bill
Any time a home connects an irrigation system, pool, boiler, or hose bib to the potable water supply, a backflow preventer is required to keep dirty water from siphoning back into your drinking water (or the municipal main). Most Southern NH water districts also require annual testing by a state-certified tester. Separately, a deduct meter is a second water meter on your irrigation or pool line that subtracts those gallons from your sewer bill, since that water never enters the sewer. A.J. LeBlanc Heating handles installation, annual testing, and paperwork with your local water district end to end.
Trusted Southern NH Plumbers Since 1928
State-Certified Backflow Testing
Annual backflow testing performed by NH state-certified testers, with paperwork filed directly with your water district.
Licensed NH Master Plumbers
All irrigation tie-ins, backflow installs, and deduct meter work performed by licensed NH master plumbers. Permits and inspections handled.
All Backflow Types
RPZ, double-check valve assembly, and pressure vacuum breaker installs sized to your system, your water district, and current NH code.
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Backflow, Irrigation Tie-Ins & Deduct Meters
Backflow Preventer Installation
A.J. LeBlanc Heating installs and replaces all common backflow preventer types throughout Southern NH, sized for your system and your water district's requirements.
- RPZ (reduced pressure zone) assemblies
- Double-Check Valve Assemblies (DCVA)
- Pressure Vacuum Breakers (PVB)
- Boiler-feed and high-hazard cross-connection devices
- Permits and inspection coordination handled
- Code-required for irrigation, pool fill, fire sprinkler tie-ins
Irrigation Tie-Ins & Annual Testing
From the supply tap inside the house out to the backflow and the irrigation contractor's manifold, A.J. LeBlanc Heating handles every plumbing connection your lawn irrigation system needs, plus the annual NH-required backflow test.
- Indoor supply tap, shut-off valve, and drain-down for winterization
- Backflow preventer install on the irrigation supply line
- State-certified annual backflow testing
- Test paperwork filed with your local NH water district
- Coordination with your irrigation contractor on commissioning
- Repair or replacement when a test fails
Deduct Meters for Lower Sewer Bills
A deduct meter (also called a sub-meter or irrigation meter) tracks water that goes outside (lawn, pool, hose bibs) and never reaches the sewer. Most Southern NH water districts credit those gallons back against your sewer charge.
- Sub-meter installation on irrigation or outdoor supply line
- Pool fill and hose bib meter setups
- Often pays for itself in one or two summers of irrigation
- Inspection coordinated with your local NH water district
- Paperwork handled so credits start showing on your sewer bill
- Sized to fit existing plumbing layout
Recent Backflow & Deduct Meter Installations
Backflow, Irrigation & Deduct Meter FAQ
What is a backflow preventer and why do I need one?
A backflow preventer is a code-required device that keeps water from your irrigation system, boiler, or other auxiliary equipment from being siphoned back into your home's drinking water supply (or the municipal supply). Most Southern NH towns and water districts require a tested backflow preventer on any lawn irrigation system, pool fill line, or fire sprinkler tie-in. A.J. LeBlanc Heating installs, replaces, and tests all common types.
What is a deduct meter and will it save me money?
A deduct meter is a second water meter installed on the line that feeds your irrigation system, pool, or other outdoor use. Because water from that line never enters the sewer, the gallons measured by the deduct meter are deducted from your sewer bill. For homes that water lawns regularly or have a pool, a deduct meter often pays for itself in one or two seasons. We coordinate the install with your local NH water district.
How often does my irrigation backflow have to be tested?
Most Southern NH water districts require annual backflow testing by a state-certified tester, typically before the irrigation season starts in spring. A.J. LeBlanc Heating tests, recertifies, and submits the paperwork to your water district. If a device fails, we repair or replace it on the same call where possible.
What type of backflow preventer do I need?
It depends on the application and the level of hazard. The three most common residential types are: Pressure Vacuum Breaker (PVB) for low-hazard outdoor irrigation; Double-Check Valve Assembly (DCVA) for moderate hazard; and Reduced Pressure Zone (RPZ) assembly for high-hazard applications and most newer codes. We size and select the right device based on your system and your water district's requirements.
Can you install the backflow preventer when I install a new irrigation system?
Yes. A.J. LeBlanc Heating handles the plumbing tie-in for new irrigation systems, including the backflow preventer, the supply line from the home, and shut-off valves for winterization. We coordinate with your irrigation contractor so the system is ready to commission when they finish heads and zones.
Do you handle the deduct meter paperwork with the town?
Yes. A.J. LeBlanc Heating coordinates the deduct meter installation and inspection with your local Southern NH water and sewer department, and walks you through the paperwork they require to start crediting the sub-meter against your sewer bill.
Get a Free Backflow or Deduct Meter Estimate
A licensed NH master plumber sizes the right backflow device, ties in the irrigation supply, or installs a deduct meter, with all permits, testing, and paperwork handled for your Southern NH water district.
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