What you need to do before you start

Turn off the water to your sprinkler system at the main valve or controller before you touch any head. If you don't know where the main shutoff is, check your system's control box — it's usually in a garage, basement, or outdoor cabinet — or trace the supply line from your meter. Turning off the water prevents spray and flooding while you work.

Once the water is off, locate the sprinkler head that needs replacing. Look for cracks in the plastic body, a head that doesn't pop up, water spraying in the wrong direction, or a nozzle that's clogged and won't clear. Mark it with a flag or stake so you don't lose it in the grass.

Gather your tools before you dig: a flat-head screwdriver, a wrench or pliers, a bucket for debris, and the replacement head. If you don't know what type of head you have, dig it up first and bring it to a hardware store or irrigation supplier — they can match it exactly. Buying the wrong replacement wastes time and money.

Key Takeaways

  • Turn off the water at the main valve before you start digging or removing any sprinkler head.
  • Dig around the head to expose the riser (the pipe it sits on), then unscrew it by hand or with a wrench depending on the connection type.
  • Clean the threads on the riser with a cloth before screwing on the new head to prevent leaks.
  • Test the new head by turning the water back on and checking that it sprays in the right direction and distance before you cover it.

Digging out the old head and exposing the riser

Use a shovel or trowel to dig a small hole around the sprinkler head, going down about 4 to 6 inches. You need to expose the riser — the short pipe or threaded stem that the head screws onto. Don't dig too wide; you just need enough room to grip the riser with your hand or a wrench.

Once the riser is visible, brush away loose soil and debris. If the head is stuck or corroded, spray it with penetrating oil (like WD-40) and wait 10 to 15 minutes before trying to remove it. This makes the job much easier and reduces the risk of breaking the riser.

Removing the old sprinkler head

Most sprinkler heads screw onto the riser by hand. Grip the head firmly and turn it counterclockwise. If it won't budge, use a wrench or pliers to hold the riser steady while you turn the head. Do not force it — if you feel resistance, apply more penetrating oil and wait longer.

Once the head comes off, inspect the riser. If the threads are damaged, cracked, or corroded, you may need to replace the entire riser, not just the head. A hardware store or irrigation supplier can tell you whether a new riser is necessary or if you can simply screw on a new head.

Some older systems use a barbed connection instead of threads — the head pushes onto a plastic barb rather than screwing on. If this is your system, pull the head straight up and off. You may need to wiggle it gently or use pliers to grip and pull.

Cleaning the riser and preparing for the new head

Wipe the riser threads with a clean cloth to remove dirt, sand, and old tape or sealant. If you see white or yellow buildup (mineral deposits), scrub it gently with a soft brush or cloth. Clean threads prevent leaks and make the new head sit flush.

If the old head had plumber's tape (also called Teflon tape) wrapped around the threads, remove it completely. Wrap 2 to 3 layers of new plumber's tape clockwise around the riser threads. This creates a watertight seal and makes the head easier to remove next time.

Installing the new sprinkler head

Screw the new head onto the riser by hand, turning clockwise. Tighten it firmly but do not over-tighten — you want it snug enough that water won't leak, but not so tight that you crack the plastic or strip the threads. A quarter-turn past hand-tight is usually enough.

If the head has an adjustable nozzle or arc, set it now before you cover the hole. Most heads let you rotate the nozzle to change the spray pattern (full circle, half circle, quarter circle) and adjust the distance the water travels. Check the package or the head itself for adjustment instructions — they vary by brand.

Testing and covering the hole

Turn the water back on at the main valve and let the system run for 30 seconds to a minute. Watch the new head spray. It should pop up (if it's a pop-up head), spray in the direction you set, and not leak at the connection point. If water drips from where the head meets the riser, turn off the water, tighten the head a bit more, and test again.

Once you confirm the head works and doesn't leak, turn off the water and cover the hole with soil. Pack the soil gently so the head sits level with the ground — a head that sits too high or too low will spray unevenly or clog with debris.

When to replace the riser instead of just the head

If the riser is cracked, the threads are stripped, or the connection is corroded and won't hold a new head, you need to replace the riser itself. This is more involved: you have to dig deeper to access the supply line, unscrew or unclip the old riser, and screw or push on a new one.

Most risers are 4 to 12 inches long and connect to the main supply line underground. If you're not comfortable doing this work, a local irrigation contractor can replace it for $50 to $150 per head, depending on depth and soil type. For a single head, that may be worth the cost and time saved.

Frequently Asked Questions

Can I replace a sprinkler head without turning off the water?

You can, but you'll get soaked and water will spray everywhere. Turning off the water takes two minutes and makes the job cleaner and safer. If you can't find the main shutoff, turn off the zone that head is on at the controller instead.

What if the new head leaks at the connection?

Turn off the water, unscrew the head, and check that the threads are clean and the plumber's tape is wrapped correctly. Rewrap the tape if needed, then screw the head back on and tighten it a bit more. Test again before covering the hole.

Do I need to buy the exact same brand as the old head?

No. Any sprinkler head that fits your riser type (threaded or barbed) and matches the spray pattern you need will work. Bring the old head to a hardware store and they can match it by size and connection type, or suggest a compatible replacement.

How often do sprinkler heads need replacing?

Most heads last 5 to 10 years depending on water quality, soil, and how often the system runs. Replace a head when it cracks, won't pop up, clogs repeatedly, or sprays in the wrong direction. Preventive replacement is not necessary unless you're upgrading the whole system.