NFPA 25 — COMPLIANCE GUIDE

NFPA 25: Fire Watch for Sprinkler System Impairment

When a sprinkler system goes out of service for testing, repair, or renovation, the building loses its primary fire suppression. NFPA 25 sets the clock on when a fire watch becomes mandatory.

> 10 hrs / 24 hrFire watch threshold

NFPA 25Governing standard

THE THRESHOLD

A fire watch is generally required when sprinkler impairment exceeds 10 hours within a 24-hour period. Impairments expected to run longer should be flagged for fire watch coverage from the start rather than waiting for the threshold to pass.

WHO THIS AFFECTS

If this is you, you probably need coverage.

Fire protection and sprinkler contractors performing testing, repair, or inspection
Building owners and property managers notified of a pending impairment
Facilities teams coordinating scheduled system shutdowns

COMMON QUESTIONS

NFPA 25 in practice

Does a partial impairment count toward the 10-hour threshold?

Yes, if the affected area is occupied or otherwise considered high-risk, a partial system impairment can still trigger the requirement.

Who notifies the fire department about the impairment?

This is typically the responsibility of the building owner or their designated impairment coordinator, per the building's pre-established impairment program.

What if the impairment is resolved faster than expected?

Fire watch coverage can end once the system is confirmed restored and tested — we coordinate directly with your technician on this.

Need fire watch on site tonight?

Certified personnel and complete round documentation your AHJ will accept.

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