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How to fix a fire sprinkler leak

We'll help you shut off the water and know when to call a professional—fire sprinklers require licensed repair.

How-to · Home plumbing
10–20 min (to shut off and call)
What you'll need
  • Access to the sprinkler system shutoff valve
  • Phone to call a licensed contractor

At a glance

  • Do not remove or tamper with a fire sprinkler head—it is life-safety equipment.
  • Shut off the water supply to the sprinkler system if a head is leaking.
  • Call a licensed fire sprinkler contractor or plumber immediately if a head leaks.
  • A leaking head may have been damaged or may indicate a system problem.
  • Keep the area clear and document the leak for the professional.
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Steps

Goal: Shut off the water, call a professional, and document the leak.

Shut off water

Goal: Stop the leak by shutting off the sprinkler system supply.

  • Locate the main valve for the fire sprinkler system—often in a locked cabinet or near the water meter. Turn it off.
  • Good: Water stops flowing from the head.
  • Bad: Cannot find the valve—call a fire sprinkler contractor or plumber immediately.

When to get help

Call a plumber or fire sprinkler contractor immediately if:

  • A fire sprinkler head is leaking.
  • You cannot shut off the water.
  • You are unsure what to do.

Do not attempt DIY repair—fire sprinklers are regulated life-safety equipment.

Verification

  • Water is shut off at the main valve.
  • A licensed professional has been contacted.
  • The area is clear and accessible for repair.

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a fire sprinkler leak?
Common causes: physical damage to the head, corrosion, a defective head, or a system pressure issue. Fire sprinklers are sealed—any leak means the head or system needs professional inspection.
Can I fix a fire sprinkler leak myself?
No. Fire sprinklers are life-safety equipment. Do not remove, repair, or replace a head yourself. Shut off the water and call a licensed fire sprinkler contractor or plumber.
When should I call a plumber for a fire sprinkler leak?
Call immediately. A leaking fire sprinkler head must be inspected and replaced by a licensed professional. Do not attempt DIY repair—it can affect system performance and may violate codes.

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