Fire watch requirements for Washington buildings — when NFPA 25 and NFPA 101 require a fire watch and what it entails

When a sprinkler or fire alarm system goes offline — for repair, inspection, or testing — Washington building owners may be required to post a fire watch. A plain-English guide to when a fire watch is required, who can do it, what the patrol must cover, and what the log must record.

What triggers a fire watch requirement

Two code sources independently trigger fire watch requirements in Washington buildings. Either one is sufficient — meeting one does not satisfy the other.

NFPA 25 (sprinkler system impairments)

NFPA 25 Chapter 15 governs impairments to water-based fire protection systems. An impairment is any condition that takes a system or a zone offline — shut for repair, drained for a head relocation, tripped for an annual dry-pipe test, or broken by a freeze event. When an impairment exists, the building's impairment coordinator must:

• Notify the AHJ, the monitoring company, and the fire department
• Implement compensatory measures — which typically means a fire watch
• Document the impairment start, end, and corrective action

NFPA 25 Section 15.3.2 specifies that a fire watch is required when a system impairment extends beyond 10 hours in a 24-hour period. Many Washington AHJs require a fire watch immediately for any impairment affecting an occupied area — treat the 10-hour window as a minimum floor, not the governing rule. Call the AHJ at the start of the impairment and confirm their specific threshold.

NFPA 101 / NFPA 1 (fire alarm system impairments)

NFPA 101 Section 9.7.6 and NFPA 1 require a fire watch when a fire detection or alarm system is impaired. The commonly applied threshold is impairment exceeding 4 hours during occupied hours or 8 hours during unoccupied hours — but AHJ practice in Pierce County and South King County varies. When in doubt, start the watch immediately and notify the AHJ.

Common triggers in commercial and multifamily buildings

Sprinkler repair or head relocation: Shutting a zone valve to replace a head, repair a leaking fitting, or relocate a head during a TI creates an impairment for that zone. Most repairs complete in under 4 hours; any job that runs longer requires fire watch while the zone is down.

Annual dry-pipe full trip test: The zone is offline from valve trip through water drain-down and air repressurization. A large dry-pipe zone — parking garage, loading dock, cold-storage annex — can take 4 to 8 hours. Fire watch is required during the impairment.

Fire alarm panel replacement or circuit work: Any time the panel or a circuit of initiating devices is impaired, the building loses supervised detection in that area. NFPA 101/NFPA 1 apply. Panel replacements that require a full programming import can run longer than a single business day — coordinate fire watch coverage with building management before the job starts.

TI construction requiring a zone shutdown in an occupied building: Zone-by-zone shutdowns limit the impaired area and may confine the fire watch requirement to one floor or wing. The sprinkler contractor will identify the minimum zone shutdown needed. Confirm with the AHJ whether daytime occupied-building shutdowns are permitted or whether off-hours work is required.

Sprinkler pipe freeze or burst (emergency): A burst pipe in an unheated parking garage or a frozen antifreeze loop requires an immediate valve shutdown and emergency repair. Emergency impairments also require immediate AHJ notification and fire watch — the scheduled-vs-emergency distinction does not exempt the building from the watch requirement.

Post-smoke detector false alarm: Some AHJs require a visual inspection of the alarm zone and a short fire watch until the cause of activation is confirmed as non-fire. The monitoring company usually advises on AHJ practice for the specific jurisdiction.

Who can be a fire watch

NFPA 25 and most AHJ interpretations require the fire watch person to be:

• Trained in fire watch duties. The person must know what to look for, how to recognize a fire condition, where the extinguishers are located, and how to call 911. Training can be a brief verbal orientation from the sprinkler contractor or building owner on the day of the impairment — it does not require a certification class.
• Dedicated to the fire watch. The fire watch person cannot simultaneously manage a construction crew, handle tenant calls, or operate a front desk. The watch is the only job during the patrol.
• Equipped with a phone. Must be able to call 911 immediately.
• Stationed near or carrying a fire extinguisher. The extinguisher does not replace the sprinkler system — it is a first-response tool while evacuation and emergency services are summoned.

The fire watch person does not need to be a licensed contractor. A building employee, a security guard, or a contractor's laborer can perform the watch with proper instruction. The building owner is responsible for ensuring the person is actually trained, equipped, and dedicated — not just checked off on a form.

Patrol scope and interval

Patrol area: The patrol must cover the full area protected by the impaired system zone. For a zone covering multiple floors or a large floor plate, the patrol route must visit the entire impaired zone — not just the corridor or lobby.

Patrol interval: NFPA 25 Section 15.3.2 and most AHJ interpretations require patrol of the impaired area at a maximum interval of 30 minutes. For buildings with sleeping areas — hotels, multifamily residential — AHJ practice may shorten this to 15 minutes. Confirm the required interval with the AHJ at notification.

Fire watch log requirements

NFPA 25 Section 15.3.2.4 requires a written fire watch log. The log must record:

• Time each patrol round started and ended
• Full name of the fire watch person
• Any conditions observed (normal, or a specific condition to report)
• Time the impairment started and was restored

The log is a document the AHJ can request during or after the impairment. Keep it for the duration of the impairment plus at least one year. The simplest format is a printed one-page form with columns for time in, time out, observer name, and observations — the sprinkler contractor can provide one if the building does not have a standard template.

AHJ notification steps

NFPA 25 Section 15.3.1 requires notification before or immediately upon start of the impairment. In practice, the notification chain for a typical Washington commercial building works like this:

1. Notify the monitoring company. The monitoring company will usually notify the AHJ and fire department automatically, or will instruct you to call the fire prevention bureau directly. Confirm which approach your specific monitoring provider uses before the next impairment — this is a question worth asking now, before you need the answer.
2. Call the local fire marshal's office or fire prevention bureau directly. Report: the address, the impairment type (sprinkler zone, full system, fire alarm), the area affected, the reason, and the estimated duration.
3. Update the AHJ if the timeline extends. If a job scheduled for 2 hours runs to 5 hours, call the AHJ again.
4. Restore and confirm. When the system is returned to service, notify the monitoring company. Some AHJs also want a direct restoration call; others track through the monitoring company. Document the restoration time in the fire watch log.

The AHJ may impose additional conditions — more frequent patrol, partial building evacuation for high-risk occupancies, or a specific restoration deadline. Record any conditions in the fire watch log.

Impairment coordinator and sprinkler contractor roles

NFPA 25 Chapter 15 assigns the impairment program to an "impairment coordinator" — a person designated by the building owner to manage the notification, fire watch, and documentation responsibilities. In practice, the impairment coordinator is usually the building owner, property manager, or facilities director. On TI projects, the sprinkler contractor typically handles AHJ notification as part of the job, but the building owner remains responsible for the fire watch and log.

Before any scheduled impairment, confirm who is responsible for each step:

Pierce County AHJ context

In Pierce County, sprinkler impairment notification routes through the same multi-AHJ structure as any fire protection work: Pierce County Fire Prevention, East Pierce Fire and Rescue, City of Tacoma Fire Prevention, or City of Puyallup Fire Department depending on project address. Confirm the correct notification number for your jurisdiction before scheduling a planned impairment.

For commercial occupancies with a monitoring company, the monitoring company typically handles notification of the correct fire department automatically. Verify this with your monitoring provider — do not assume automatic notification applies to your account configuration without confirming it.

For construction TI projects: the GC and the building owner should agree in the pre-construction meeting on who is responsible for each step in the impairment program. Ambiguity here has caused permit-delay findings at Pierce County plan review.

Last reviewed by Michael Berger, Owner · 1st Choice Fire · WA L&I #1STCHCF770OF