United States High-risk taskVersion 1Updated September 25, 2026

Fire sprinkler inspection checklist

Free fire sprinkler inspection checklist based on OSHA 29 CFR 1910.159: control valves, 18-inch clearance, piping, waterflow alarm and test records.

How often: A main drain flow test every year and the inspector's test valve opened at least every two years. How often to walk the system with this checklist is set by your organization, together with your contractor, insurer and local fire code.

Sections
6
Checks
33
Critical
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Sources
32

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1

Building or site *

2

System, riser or zone inspected *

3

Date of this inspection *

4

Name of the person inspecting *

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Type of system *

6

Was this system installed to meet an OSHA standard? *

7

Number of sprinklers on this system

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Frequently asked questions

How often does a fire sprinkler system need to be inspected?

For a system installed to meet an OSHA standard, the federal rule sets two intervals: a main drain flow test every year [13] and opening the inspector's test valve at least every two years [14]. Inspection intervals beyond that come from your contractor's program, your insurer and your local fire code.

Does OSHA 1910.159 apply to every sprinkler system?

No. It applies to systems installed to meet a particular OSHA standard [6]; systems installed in workplaces but not required by OSHA are exempt from that section [8]. Older systems installed to the NFPA or NBFU standard in effect at the time are accepted [7]. Whatever the reason a system was installed, the exit route rule still expects safeguards such as sprinkler systems to be in proper working order [32].

How much clearance is needed below sprinkler heads?

At least 18 inches (45.7 cm) of vertical clearance between the sprinklers and material below [9]. Building members and contents should also cause a minimum of interference to the discharge pattern [10], so check new racks, partitions and ducts as well as stack height. Your local fire code may set a larger clearance for some storage.

What do we do when the sprinkler system is shut off?

Provide an auxiliary water supply or equivalent protection while the automatic water supply is out of service [22]; systems of 20 or fewer sprinklers are excepted [23]. OSHA's guidance says equivalent protection may include a staffed fire watch with extinguishers or hose lines, or a secondary water supply [1]. Tell your fire alarm company, insurer and local fire department as your procedures and local code direct.

Built from 32 official sources

Every check traces to the text it is based on. Read the purpose, how to use it, the rules behind it, what it does not cover and every source.

Guidance, not legal advice. It does not replace the law, the manufacturer's instructions or your organization's competent people, and completing it does not certify that work is safe.