The type of backflow preventer you need depends on what's on your side of the meter. High-hazard uses like medical offices or chemical irrigation need an RP. Lower-hazard lines can use a double check. Irrigation often uses a PVB or SVB. Your district has the final say, and we confirm it before we quote.
- PriceFree quote
- TimeUsually 1 day
- TestIncluded
- FilingIncluded
Ready to book? Same-week appointments.
What decides the type
- Pipe size and water demand
- Where it can be installed and tested
- What the water is used for
- Your district's requirements
Matching the device to the risk
The type of backflow preventer you need depends on what could get into the water if it flowed backward. Districts group connections into hazard levels, and each level allows certain devices.
High-hazard uses, like medical and dental offices, car washes, chemical feeds and many commercial kitchens, generally need an RP assembly or an air gap. Lower-hazard connections, such as many fire sprinkler systems, can often use a double check. Irrigation systems that only face backsiphonage may use a pressure vacuum breaker or spill-resistant vacuum breaker.
Your water district has the final word. Before we quote, we confirm what the district requires for your connection so you don't pay for the wrong device.
Picking the right size
A backflow preventer has to be big enough to pass the water your property uses without dropping pressure too much. Every device causes some pressure loss, and an undersized one can leave upstairs fixtures weak or sprinklers sputtering.
We look at the pipe size, the peak water demand and the pressure available at the meter. For most homes in Redlands, that points to a 3/4-inch or 1-inch device. Commercial buildings and fire lines often need 2 inches and up.
Bigger isn't always better either. An oversized device costs more, takes more space and can be harder to keep passing. We size it for what you actually use.
District approval and permits
Many water districts want to know about a new backflow device before it goes in. Some require plans for commercial installs, some only need the first test report afterward. Cities may require a plumbing permit, especially on commercial jobs or when the device is going on a fire line.
We'll tell you what's likely needed for your project and include it in the plan. If a permit is required, the timeline accounts for it.
After installation, the device is tested and the first report is filed. That puts it on the district's list and starts its annual testing schedule.
Common reasons for a new preventer
New buildings are the most common reason. Commercial projects and homes with new irrigation usually need protection before the water service is signed off.
Adding equipment is another. Installing sprinklers, a pool, a boiler or a fire sprinkler line often brings a new requirement. Changing how a space is used, like store to restaurant, can too.
Other times a district review finds an unprotected connection. In every case, we confirm the right type, size it, install it and file the first test report.
Preventers for sprinkler systems
Irrigation is one of the top reasons for a new preventer. The right type depends on the district and the system: PVB, SVB, double check, or RP if fertilizer or chemicals will be injected.
We consider the slope of the property, valve locations and any planned chemical feed before recommending a device and spot.
Commercial and fire line installs
Commercial installs often involve larger devices, plans, permits and coordination with general contractors or fire sprinkler contractors. Fire lines typically use detector assemblies sized 4 inches and up.
We work with your contractor and schedule so the preventer goes in at the right point in the project, and the startup test is done before final inspection.
Understanding your installation quote
Every installation quote lists the device type and size, the labor, any fittings or piping changes, and protection like a cage or cover if you want one. It also includes the startup test and filing the first report with your water district.
If permits are needed, we'll say so and include them or explain how they're handled. There's no charge for the quote, and you'll know the total before we schedule the work.
Already have a device that seems like the wrong type? We can review it against your district's requirements and tell you whether it needs to be replaced or can stay.
Need help deciding?
See our RP vs. double check vs. PVB guide, or call and we'll look at it with you.
Questions
Do you pull permits?
When a permit is required, we let you know and include it in the plan.
Can the wrong size cause problems?
Yes. Too small can drop pressure, and too big can cost more and be harder to keep passing.
Can I install a PVB instead of an RP to save money?
Only if your district allows it for your hazard. For high-hazard uses, an RP is usually required.
Will the district add the new device to its records?
Yes. Filing the first test report puts it on their list and sets the first annual due date.
Will my district need to approve it?
Many do. We check the requirements and handle the paperwork with you.
Is installation priced up front?
Yes. You get a free quote after we look at the site.
Working with a local backflow company
When you call us about backflow preventer installation, you're talking to a company that focuses on backflow prevention. That focus means we know the devices, the test procedures and what your water district expects to see on the report.
Here's what you can count on: certified testers, calibrated gauges, a price before any work, and filing with your district included. Testing is $105 flat per device under 4 inches and $175 for 4 inches and up. We pick up seven days a week from 6am to 12pm, book most visits within the week and take emergency calls 24/7. Every customer gets a copy of the report for their records.
Backflow Preventer Installation in Redlands and nearby
Need backflow Preventer Installation outside Redlands? We also cover Loma Linda, Mentone, Calimesa, Highland and Yucaipa. Same-week visits are normal, and booking takes a couple of minutes.