Your System Is Only as Strong as the Water Behind It.
The sprinkler heads on your roof are the visible part. The water supply behind them determines whether the system runs for 20 minutes or 8 hours. FireRoofs engineers every installation around your specific water conditions.
Municipal supply, pool backup, dedicated tanks, booster pumps — each property gets a water strategy matched to its system tier, property layout, and risk level.
The Question Nobody Asks Until It Is Too Late
How much water does a wildfire sprinkler system actually use? A typical residential system runs 15 to 40 gallons per minute depending on how many zones are active. That means a single hour of operation uses 900 to 2,400 gallons. A 4-hour runtime — which is realistic for a wildfire passing through a neighborhood — needs 3,600 to 9,600 gallons.
Municipal water works fine under normal conditions. But during a wildfire, every home on the street is drawing simultaneously. Fire hydrants are open. Pressure drops. The homes that keep their sprinklers running are the ones with backup supply or booster capacity already in place. This is one of the key factors in why some homes survive wildfires and others do not.
FireRoofs measures your water pressure at the meter during the site evaluation. We calculate flow rate requirements for your specific system design. And we recommend the right combination of supply and pressure equipment before installation begins.
Four Ways To Power Your System
Most installations use municipal water as the primary source with one backup option. Properties in high-risk areas or with known pressure issues often combine two or more. Not sure about your area's fire risk? Check your wildfire risk on our interactive map.
Municipal Water
Your home's existing water supply. Works well for many properties but pressure can drop during community-wide emergencies when multiple homes draw simultaneously.
- No additional equipment for basic systems
- Unlimited supply under normal conditions
- Lowest upfront cost
- Pressure may drop during wildfire events
- Dependent on utility infrastructure
- May need booster pump for adequate flow
Swimming Pool Backup
Your existing pool becomes an independent water reserve. A dedicated pump and filtration system draws from the pool when municipal pressure drops below a set threshold.
- Uses existing water you already maintain
- 15,000 to 25,000 gallons typical
- Automatic switchover on pressure loss
- Requires dedicated pump installation
- Seasonal water level variation
- Filtration needed to protect sprinkler heads
Dedicated Water Tank
A standalone water storage tank sized specifically for your system. This is the most reliable option for properties without a pool or where municipal supply is questionable.
- Completely independent of utilities
- Sized exactly to your system needs
- Works on well water or trucked-in supply
- Requires space on property
- Higher upfront investment
- Periodic refill maintenance
Booster Pump
Increases water pressure for properties where the existing supply falls below optimal levels. Essential for steep lots, long pipe runs, or homes with low municipal pressure.
- Ensures consistent spray coverage
- Compensates for elevation changes
- Works with any water source
- Requires electrical power (battery backup available)
- Additional equipment to maintain
- May need generator for extended outage
Every Tank, Pump, and Connection Is Sized to Your System
There is no standard size. A Keystone roof-only system on a 2,000 square foot home needs far less water than a Fortress full-perimeter system on a 5,000 square foot home with a steep hillside. See our wildfire mitigation cost guide for pricing on tanks, pumps, and pool connections. These are the factors that drive sizing:
Property Size
Larger properties need more zones and longer pipe runs, increasing total flow requirements.
Target Runtime
How many hours should the system run without resupply? 2 hours minimum. 4 to 8 hours recommended for high-risk areas.
Flow Rate
Typical residential systems use 15 to 40 GPM. Guardian and Fortress tiers with eave sprinklers use the higher end.
Number of Zones
Each active zone adds to simultaneous water demand. Three-zone systems need roughly 3x single-zone flow.
Quick Reference: Water Volume by System Tier
| System Tier | Flow Rate | 4-Hour Runtime | Tank Recommendation |
|---|---|---|---|
| Keystone (Roof) | 15–20 GPM | 3,600–4,800 gal | 2,500–5,000 gal |
| Guardian (Roof + Eave) | 25–35 GPM | 6,000–8,400 gal | 5,000–8,000 gal |
| Fortress (Full + Foam) | 30–40 GPM | 7,200–9,600 gal | 8,000–10,000 gal |
Common Questions
How much water does a wildfire sprinkler system use?
A typical residential system uses 15 to 40 gallons per minute depending on zones activated. Runtime targets range from 2 to 8 hours. A Guardian-tier system running all zones for 4 hours would use approximately 6,000 to 8,400 gallons.
Can I use my swimming pool as a backup water source?
Yes. FireRoofs installs pool backup connections with automatic switchover when municipal pressure drops. A standard 15,000-gallon pool provides 4 to 8 hours of supplemental runtime. A dedicated pump and filtration system protects sprinkler heads from debris.
What size water tank do I need?
Tank sizing depends on your system tier, number of zones, and target runtime. Common starting points: 2,500 gallons for roof-only, 5,000 to 8,000 gallons for roof-plus-eave, and 8,000 to 10,000 gallons for full perimeter. FireRoofs sizes every tank during the site evaluation.
Do I need a booster pump?
If your municipal pressure falls below 40 PSI at the meter, or your property has long pipe runs, elevation changes, or many sprinkler heads per zone, a booster pump ensures consistent coverage. We measure your pressure during the evaluation and include a pump recommendation if needed.
What happens if the power goes out during a fire?
Battery backup options are available for booster pumps and pool connection pumps. Municipal water pressure operates independently of your home's electrical supply. Tank-fed gravity systems can operate entirely without power depending on tank elevation relative to the sprinkler heads.
Not Sure About Your Water Supply?
During every free evaluation, we measure your water pressure at the meter, assess flow rate potential, and identify the best backup strategy for your property. No charge, no commitment.
- Water pressure measurement at the meter
- Flow rate calculation for your system design
- Tank, pool, or pump recommendation if needed
Takes about a minute. No account needed.