Irrigation Backflow, Backflow Preventers & Deduct Meters in Southern NH
A.J. LeBlanc Heating installs and replaces irrigation backflow preventers, completes irrigation plumbing tie-ins, and installs deduct meters where local programs allow them. The work is performed by licensed New Hampshire master and journeyman plumbers.
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 keeps water from siphoning back into your drinking water or the municipal main. The required device and testing schedule depend on the connection, hazard level, and water supplier, so we confirm the local requirements before installing the correct assembly.
Some local water or sewer utilities offer a deduct-meter program for irrigation or pool water. The second meter tracks qualifying outdoor use so those gallons can be excluded from the sewer charge because that water does not enter the sewer.
A.J. LeBlanc Heating handles backflow-preventer installation and replacement, irrigation plumbing tie-ins, and deduct-meter installation. We confirm the installation and inspection requirements with the local utility before work begins.
Family-Owned in Southern NH Since 1928
Local Requirements Confirmed
We confirm the approved backflow device and installation requirements with the local water supplier before the work begins.
Licensed NH Plumbers
All irrigation tie-ins, backflow installs, and deduct meter work are performed by licensed New Hampshire master and journeyman plumbers. We coordinate permits and inspections when the work requires them.
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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Voted Best HVAC, Best Plumber, and Best Electrician in the Union Leader Readers' Choice Awards by Southern NH homeowners year after year.
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 & Backflow Installation
From the supply tap inside the house to the backflow preventer and irrigation contractor's manifold, A.J. LeBlanc Heating handles the plumbing connections within our scope and coordinates the handoff with the irrigation company.
- Indoor supply tap, shut-off valve, and drain-down for winterization
- Backflow preventer install on the irrigation supply line
- Coordination with your irrigation contractor on commissioning
- Replacement of accessible backflow assemblies
- Required permit and inspection coordination
Deduct Meters for Lower Sewer Bills
A deduct meter (also called a sub-meter or irrigation meter) tracks approved outdoor water (lawn, pool, hose bibs) separately from household water that reaches the sewer. Where the local utility offers the program, those gallons can be excluded from the sewer-use charge.
- Sub-meter installation on irrigation or outdoor supply line
- Pool fill and hose bib meter setups
- Can lower sewer charges and offset the installation cost over time
- 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 keeps water from your irrigation system, boiler, or other auxiliary equipment from flowing backward into your home's drinking water supply or the municipal main. The required device depends on the connection, hazard level, plumbing code, and water supplier. A.J. LeBlanc Heating installs and replaces common residential backflow preventers and confirms the local installation requirements before work begins.
What is a deduct meter and will it save me money?
A deduct meter is a separate meter on an approved irrigation, pool, or other outdoor-water line. Where the local utility offers a deduct-meter program, water measured by that meter can be excluded from the sewer-use calculation because it does not enter the sewer. For households with regular approved outdoor use, that can create meaningful sewer-bill savings and help offset the installation cost over time. We confirm the local requirements and coordinate with your water district.
How often does my irrigation backflow have to be tested?
Testing frequency depends on the assembly and the water supplier's cross-connection program, and required testing must be completed by a certified backflow tester. Follow the notice from your water supplier or ask the supplier which testing and reporting schedule applies to your assembly.
What type of backflow preventer do I need?
It depends on the connection, hazard level, plumbing code, and water supplier. Common residential devices include pressure vacuum breakers, double-check valve assemblies, and reduced pressure zone assemblies. We confirm the approved device with the water supplier and size the installation for the system.
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 New Hampshire plumber sizes the backflow device, ties in the irrigation supply, or installs a deduct meter. We coordinate the permits and inspections required for our work.
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