How Deep Are Sprinkler Lines Buried Underground?

You don’t have to dig too deep to find out

Automatic lawn watering system
Photo: Eugene_Photo / Adobe Stock
Automatic lawn watering system
Photo: Eugene_Photo / Adobe Stock
Highlights
  • Sprinkler lines are buried 8 to 12 inches underground.

  • At their shallowest, sprinkler lines should be 4 inches underground.

  • Consult a sprinkler installer to determine the right depth based on your yard and home.

  • Knowing the depth of sprinkler lines reduces your chances of damaging them.

Get quotes from up to 3 pros!
Enter a zip below and get matched to top-rated pros near you.
Geo Icon

Excavating your backyard? Installing an underground sprinkler system? You’ll need to know how deep sprinkler lines are buried. If your yard has existing underground lines, knowing how deep they’re buried will help avoid damaging them. And if you’re about to install a sprinkler system, burying your line at the right depth means the system will last longer without damage.

Minimum DepthAverage DepthMaximum Depth
4 inches8 inches12 inches

How Deep Are Sprinkler Lines?

Most sprinkler professionals recommend burying sprinkler lines 8 to 12 inches deep in the ground. Sprinkler lines should be buried at least the depth of the pipe, which is 4 inches. But you’ll want to dig a trench closer to 12 inches in some climates and yards to cover your sprinkler system. Consult a local sprinkler installer to determine the best depth for your system based on your lawn and its watering needs.

Factors That Influence Sprinkler Line Depth

The depth of a sprinkler line is buried depends on several factors.

Climate

If you live in an area that experiences all four seasons, you need to figure out the frost line in your area. The frost line refers to how deep underground the soil freezes during winter months. When a sprinkler line isn’t buried deep enough, it could freeze in the cold, leading to cracks or bursts in the line. If your area experiences extreme cold temperatures frequently, your sprinkler line should be deeper in the ground.

In warmer climates, where the ground has less risk of freezing, you can bury sprinkler lines less deep, around 6 to 8 inches. Just make sure lines are buried 4 inches deep at minimum to avoid damage.

Traffic

If a lawn experiences heavy foot traffic or has a sprinkler line by the driveway or other paths, burying the line deeper to prevent pressure or weight from cracking the lines below is recommended. 

Lawn Maintenance

The sprinkler line should be at least 6 inches deep if a lawn is aerated regularly. This maintenance schedule should prevent a mechanical aerator from puncturing a hole in the line. 

As for mowing the lawn, if you use a ride-on mower, the weight from the machine can put too much pressure on sprinkler lines. Use a light-weight mower on areas with sprinklers.

Mowers pose more of a risk to sprinkler heads than sprinkler lines, which is why many homeowners opt for underground sprinkler heads that automatically rise aboveground when the watering timer starts.

Soil Type

The type of soil your lawn sits on will also impact sprinkler depth. If the soil is sandier, water drains from it faster, so the sprinkler line should be buried deeper. That means it’s best to bury sprinkler lines for well-draining soils, such as sandy, loamy, and silty soils, deeper—at least 8 inches deep.

However, poorly draining soils, such as clay, peat, or any compacted soil, benefit from shallower installation (closer to that 4-inch mark if you don’t live in a colder climate).

Soil Types for Deeper LinesSoil Types for Shallower Lines
SandyClay
LoamyPeat
SiltyCompacted

Sprinkler System Type

The type of sprinkler head on your irrigation system can impact how deep a line should be buried. 

  • Spray heads: These heads sit just at surface level and don’t need to be buried more than 4 inches deep.

  • Drip irrigation systems: Drip sprinkler systems can be buried between 4 and 12 inches deep. 

  • Rotating sprinkler heads: This option has gears and a motor and needs to be buried at least 4 inches deep, but they’re often buried 6 inches deep to prevent damage to the mechanism.

  • Rotor sprinklers: These are high-powered and should be buried at least 8 inches deep.

11 sprinkler system parts illustrated, including meter, valve box, risers, and sprinkler

Frequently Asked Questions

You can find irrigation lines whether you dig or not. If you decide to dig, do so near valve boxes and around sprinkler heads. Once you find the first pipe, you can map the system from there and use spray paint or tape to mark the pipe layout throughout.  

If you don’t feel like digging, aside from getting a map from the maker of the irrigation system, you can still find irrigation lines by locating the valve box and following a line back to the head sprinklers. You can also use a water-detection device or a metal detector, which will work if the lines have metal tracer wires.

If you have a broken sprinkler pipe underground, there will be some signs you can easily spot to locate it and take action. These include leaks, water spouts, flooding, consistently damp areas on your lawn, low water pressure, and grass around the sprinkler head that’s taller and darker than anywhere else in the yard. 

If there are no obvious signs of a broken pipe, you can use tools such as water leak mics, leak noise loggers, audio devices that record leaks, and acoustic testing links. 

Broken pipes can lead to uneven watering, plant damage, and higher utility bills. The longer you wait to fix them the more the repair cost may be.

The easier way to find buried sprinkler lines is to use the plan from the professionals who installed the system. If you don’t have professional plans, listen for running water on your lawn when you turn on the system. You may also spot wet areas, giving you an idea of where the heads are. Once you find the sprinkler heads, you’ll likely be able to connect the dots between them, revealing the system below.

Need professional help with your project?
Get quotes from top-rated pros.
The homeowners guide to lawn irrigation services
From average costs to expert advice, get all the answers you need to get your job done.
Automatic garden lawn sprinkler
Mar 21, 2025
Mar 21, 2025
Looking to learn how to clean your sprinkler heads for a strong, healthy lawn? Look no further—here are five simple steps to achieve this easy DIY project.
Automatic sprinkler system
Mar 13, 2025
Mar 13, 2025
Putting your sprinkler system to bed for winter will help avoid damage from freezing temperatures. Use this guide to winterize your sprinkler system.
Close-up of a drip irrigation system
Mar 13, 2025
Mar 13, 2025
Learning how to convert your sprinkler to drip irrigation saves you money on water use and reduces weed growth. Follow this guide to learn how to do it.
 luxury  house with lush lawn
Mar 13, 2025
Mar 13, 2025
How long to water your grass depends on the type of grass, the season, where you live, and more. Learn when to stop watering grass with this guide.
Woman and child running through sprinkler in yard.
Mar 24, 2025
Mar 24, 2025
Learn how to adjust Rain Bird sprinkler heads, no matter the type. Fine-tuning your sprinklers ensures optimal water usage and reach.
Multiple stream sprinkler head
Mar 13, 2025
Mar 13, 2025
Looking for pointers on how to design a sprinkler system? Use this guide to navigate the process and create the DIY sprinkler system of your dreams.
Share project details to get started.