07/10/2026
Exterior Wildfire Sprinkler Systems
What Are They?
Exterior wildfire sprinkler systems are designed to wet your home's roof, exterior walls, decks, and the area immediately surrounding the structure. Their primary purpose is to reduce the potential for ignition from wind-driven embers and to increase localized humidity around the home.
Exterior sprinkler systems are intended to supplement FireSmart practices-they are not a substitute for them.
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Before Installing a System
Before investing in an exterior sprinkler system:
• FireSmart your property first.
• Maintain a 0-1.5 m (0-5 ft) non-combustible zone around your home.
• Remove combustible debris from roofs, gutters, decks, patios, and around the foundation.
• Ensure the sprinkler system provides adequate coverage of the roof, eaves, exterior walls, decks, and other vulnerable areas.
• Test and maintain the system annually before wildfire season.
• Familiarize yourself with the operation of the system before an emergency occurs.
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When Should It Be Used?
Exterior sprinkler systems should generally be activated only when you are evacuating under an Evacuation Order or when directed by emergency officials.
Once the system is activated:
• Leave the property immediately.
• Do not remain behind to defend your home.
• Do not return until emergency officials advise it is safe to do so.
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Municipal Water Supply
Homeowner sprinkler systems draw water from the same municipal water system used by firefighters.
Please keep the following in mind:
• Do not operate sprinklers unnecessarily before your property is at risk.
• Running sprinklers for extended periods can reduce water pressure throughout the municipal distribution system.
• During a wildfire, maintaining adequate water supply for fire suppression is critical to protecting the community.
• Use your sprinkler system responsibly and only when there is a genuine threat to your property.
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Limitations
Exterior sprinkler systems have limitations and may be less effective when:
• Strong winds prevent water from reaching the structure.
• Electrical power is interrupted.
• Water pressure is reduced due to high system demand.
• The system has not been properly maintained or tested.
• Combustible vegetation or materials remain close to the home.
• Wildfire intensity exceeds the system's ability to keep surfaces wet.
No exterior sprinkler system can guarantee that a home will survive a wildfire.
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Fire Department Considerations
The Merritt Fire Rescue Department:
• Cannot activate private sprinkler systems.
• Cannot monitor, maintain, or repair homeowner-installed systems.
• Cannot guarantee municipal water pressure or water availability during a wildfire.
• Will prioritize life safety, firefighter safety, and community protection based on incident conditions.
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Remember
The best protection against wildfire starts long before smoke is in the air.
✔ FireSmart your property.
✔ Maintain a non-combustible zone around your home.
✔ Remove combustible materials from roofs, gutters, decks, and around the foundation.
✔ Prepare your emergency plan and be ready to evacuate.
✔ Activate your sprinkler system only when evacuating or as directed by emergency officials.
A FireSmart home, combined with a properly installed and appropriately operated exterior sprinkler system, has a greater likelihood of surviving a wildfire than a home relying on sprinklers alone.
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Disclaimer
This information is provided as general guidance by the Merritt Fire Rescue Department to assist homeowners in preparing for wildfire. Homeowners are responsible for ensuring any exterior sprinkler system is properly designed, installed, maintained, and operated in accordance with the manufacturer's recommendations and all applicable codes and regulations.
The Merritt Fire Rescue Department does not endorse or certify any specific sprinkler system, product, or installer, and cannot guarantee the performance or effectiveness of any exterior sprinkler system during a wildfire. The decision to activate a sprinkler system rests solely with the homeowner, and occupants should never delay evacuation or remain on the property to operate or monitor the system. Firefighter actions during a wildfire will be based on incident conditions, available resources, and operational priorities.