How Much Does Sewer Backflow Preventer Installation Cost? [2024 Data]
Normal range: $150 - $450
The average cost of sewer backflow preventer installation is $150 to $450, with a national average of $350. Budget for annual backflow testing and maintenance.
Backflow preventer installation costs between $135 and $1,100 (or more if extensive labor is required). On average, you’ll pay $350 to install a backflow preventer. The complexity of your home’s layout and the exact device your plumbing system needs could drive up the costs.
- Average
- $350
- Low end
- $135
- high end
- $1,100
What Factors Influence the Cost of Sewer Backflow Preventer Installation?
Backflow repair costs can vary quite a bit, especially if you need to dig into your foundation to access your plumbing. When considering sewer backflow preventer installation costs, you should think about the following factors.
Type of Preventer
When it comes to safeguarding your water supply from potential contamination, choosing the right backflow preventer is crucial. These devices come in various sizes and types, each tailored to specific applications. Here's a cost breakdown to help you make an informed decision.
| Type of Preventer | Average Cost* |
|---|---|
| Hose | $3–$35 |
| Appliance | $10–$100 |
| Sprinkler/sewer | $100–$600 |
| Basement drain | $150–$1,000 |
*not including labor
Garden Hose Backflow Preventers
For basic backflow prevention on your garden hose, you have affordable options. These small devices ensure water flows in one direction while keeping contaminants at bay. Prices for these models typically range from a budget-friendly $3 to $35 as a more moderate option.
Appliance Backflow Preventers
When it comes to appliances like power washers, slightly larger backflow preventers are required. These units must be installed downstream of your residential water meter to be effective. The cost for these larger models falls within the range of $10 to $100.
Sprinkler or Sewer System Backflow Preventers
For more extensive systems like sprinklers or sewer lines, you'll need more robust backflow preventers. These systems are larger, more complex, and designed to be installed on main sewer pipes. They incorporate multiple valves and chambers, allowing air to enter the pipe to prevent backflow in atmospheric models. They may also use valves to block backflow during pressure drops in reduced-pressure models.
As a result, the price tag for these systems falls between $100 and $600.
Basement and Floor Drain Backflow Preventers
Ensuring backflow prevention in challenging areas of your home, such as the basement, can be a bit more costly due to the complexity of installation. Expenses for accessing buried pipes can drive up the overall cost, with backflow preventers for basement floor drains ranging from $150 to $1,000.
Valve Size
The cost of a backflow prevention device varies widely, often ranging from $35 to $600. Factors like system size and desired efficiency greatly affect the price. If you're installing multiple units, you might see some cost savings, including reduced labor expenses.
| Valve Diameter in Inches | Average Cost* |
|---|---|
| 1/2 | $35–$55 |
| 1 | $50–$100 |
| 2 | $75–$200 |
| 6 | $100–$300 |
*not including labor
Condition of Pipes
However, when dealing with older pipes made from non-plastic materials, the installation process can become more complex and expensive. Retrofitting such pipes for backflow prevention requires specialized techniques and materials, raising the overall project cost. Careful consideration of these factors is essential for informed decision-making.
Job Complexity
The cost of your backflow prevention system depends on factors like system size and type. Pipe system age is a significant factor, as older systems require more complex installation, increasing costs. Larger houses also necessitate more robust preventers, further impacting the overall price.
How Much Does It Cost to Install a Sewer Backflow Preventer Near You?
The national average cost for installing a sewer backflow preventer is about $350 for parts and labor. However, larger device installations and high cost of living areas could bring the price to as much as $1,100 for parts and labor.
Local Permitting Fees
Whether you go it alone or hire a pro, you need to pay a permit fee to your local sewer service, which starts at $50. This fee can go even higher if you’re installing a backflow preventer in a commercial property or as part of a larger sprinkler system.
What Sewer Backflow Preventer Can I Get on My Budget?
Most sewer backflow preventers are made out of PVC pipe. But additional features can drive your costs up.
Here are some backflow preventer cost guidelines for your installation:
| Preventer Pipe | Average Cost |
|---|---|
| Basic PVC pipe | $35+ |
| Extendable top | $75–$150 |
| Clear plastic lid | $150–$200 |
You may also be able to save a few dollars by getting a basic PVC pipe model. Clear backflow preventers or ones with removable tops tend to be a little more expensive.
How Much Does It Cost to Install a Sewer Backflow Preventer by Type?
The cost of installation won’t change much based on the type of sewer backflow preventer you choose (i.e., PVC pipe versus clear or removable tops). Most of your expenses will come from the labor hours of installing the device, which will range between $150 and $450.
Basic PVC Pipe
Basic PVC pipe backflow preventers are for simple residential scenarios, and they require minimal labor—costing closer to the low end of $150—for installation. Typically, these devices are used to prevent backflow in garden hoses or household appliances. Installation usually involves connecting them directly to the hose or appliance inlet, making it a DIY-friendly option.
The affordable cost—as low as $35—and minimal labor requirement make basic PVC pipe preventers an excellent choice for those seeking a cost-effective, hassle-free solution.
Extendable Top
Extendable top backflow preventers cost between $75 and $150 and are versatile and adaptable, making them suitable for a range of applications. They are often used in commercial and industrial settings with complex plumbing systems but are also a great option for complex residential systems.
While installation may require more labor due to their adjustability, this feature allows them to accommodate various pipe sizes and heights. Despite the labor cost involved—between $300 and $400—the flexibility they offer justifies their use in situations where adaptability is essential.
Clear Plastic Lid
Backflow preventers with clear plastic lids cost $150 to $200 and are employed in scenarios where visibility and inspection are critical. Installation may require high labor costs—likely toward the higher end of $450—as these devices are important for irrigation systems, swimming pool plumbing, and industrial processes.
Proper alignment and connection to existing plumbing are essential during installation. The benefits of easy visual monitoring make these a valuable choice for environments prioritizing water quality and safety.
Cost to Install a Sewer Backflow Preventer Yourself
You can install a sewer backflow preventer by yourself for as little as $35 if you have the tools necessary to get the job done. However, the layout of your home could drive the price up.
For example, you may need to rent or buy a drill to access the area underneath your basement floor. In older houses, you may need to remove objects that block the spot where you will have your backflow preventer installed.
Cost of Common Add-Ons
When planning a backflow preventer installation, it's essential to consider additional components that can enhance functionality and security. Here are some common add-ons and their estimated prices:
Thermostatic Freeze Relief
To protect your backflow preventer from freezing during cold weather, buy a thermostatic freeze relief valve. Prices vary depending on the type and size of the valve but often cost around $100.
Anti-Theft Device
Prevent theft and tampering of your backflow preventer by adding an anti-theft device. These can cost anywhere from $200 to $300, depending on the model and security features.
Ongoing Costs
Beyond the initial installation, understanding the ongoing costs associated with maintaining and ensuring the effectiveness of your backflow prevention system is crucial for long-term reliability.
Backflow Testing
Regular backflow testing is crucial to ensure the preventer functions correctly. Testing costs vary depending on location and service providers but typically range from $70 to $90 per test. Annual testing is often recommended to maintain compliance with local regulations.
Repairs to an Existing System
If your existing backflow preventer requires repairs, the cost can vary widely based on the extent of the damage and the specific parts needing replacement. Repairs can cost anywhere from $50 to $100, depending on whether the fixes are minor or are complete overhauls or component replacements. It's essential to address issues promptly to maintain the system's integrity and compliance.
How to Save Money on Backflow Preventer Installation Costs
Saving on backflow preventer installation costs can be achieved through several strategies:
Compare quotes from multiple reputable contractors to ensure you're getting a competitive price.
Consider installing a basic PVC pipe backflow preventer for simpler applications, as they are cost-effective and have minimal installation requirements.
Bundle multiple plumbing jobs if you have other projects you need to complete, which may lead to discounted labor costs.
Regular septic tank maintenance and testing can also reduce long-term expenses by preventing costly repairs or replacements.
Check for local rebates or incentives for backflow prevention installation to further reduce your upfront costs.
Ben Kissam contributed to this piece.
Frequently Asked Questions
Be sure to consider how often you may need access to your pipes in the future. This can help you decide if you want to install a basic PVC backflow preventer or spring for a clear or removable one.
If you think you’ll need access to your plumbing often, or if your pipes have a history of problems, it’s probably worth spending a little more for something you can look into without removing the backwater preventer.
If you’ll be digging up your floor to get access to your pipes when putting in a sewer backflow preventer, this would also be a good time to take care of any other plumbing issues or renovations. For example, you could install additional pipes for a basement bathroom. Since the floor will be sealed over with concrete when you’re done, now’s a good time to take care of those bigger tasks.
For complex projects that involve drilling, hiring a professional plumber makes a lot of sense.
You’ll pay a couple hundred dollars extra, but you’ll also have peace of mind that a pro will handle the job. If you can easily access your pipes in your front or backyard, DIY installation is definitely a great way to save money.
Either way, installing a backflow sewer preventer is great for your plumbing and your family’s health, as it’ll keep smelly water from backing up in your pipes and infiltrating your home.