Color-Coded Fire Hydrants & NFPA Standards Explained

Download Article

Plus, whether cities are obligated to paint fire hydrants certain colors

Co-authored by Elaine Heredia, BA

Last Updated: July 25, 2026 Fact Checked

Download Article

NFPA Fire Hydrant Color Code

|

Code Importance

|

Do hydrants have to be a certain color?

|

How Fire Hydrants Work

|

Video

Have you ever been curious why fire hydrants are painted different colors? Some hydrants are even painted one color on the barrel and another on the cap! If your city follows the National Fire Protection Association (NFPA) hydrant color code, then these colors were chosen on purpose. Whether you're studying to become a firefighter or are just a curious citizen, this article will guide you through the NFPA fire hydrant colors and their meanings. We'll also explain why this color code is important, whether fire hydrants must be painted specific colors by law, and more.

NFPA Hydrant Color Code Chart

Download Image

A reference chart showing the NFPA standard colors for fire hydrant bonnets and barrels, as well as what each color means.

NFPA Code 291 sets the standard for fire hydrant bonnet and barrel colors. Under these guidelines, bonnets should be painted light blue, green, orange, or red to indicate how quickly the water flows out of those hydrants. Public hydrant barrels should be chrome yellow, and private hydrant barrels should be shiny red.

Section 1 of 4:

NFPA Fire Hydrant Colors & Their Meanings

Download Article

1
The color of a fire hydrant’s bonnet indicates water flow. The NFPA fire hydrant color coding system helps firefighters tell at a glance how much water they have access to in a specific hydrant. Many, but not all, cities in the U.S. use this standard (found in NFPA 291) when painting or repainting the knob-like bonnet on top of their hydrants. Here's a breakdown of the standard bonnet colors, their classes, and how much water flow in gallons per minute (GPM) each one represents:^{[1]
X
Research source}
- Light blue (Class AA): >1500 gpm
- Green (Class A): 1000-1499 gpm
- Orange (Class B): 500-999 gpm
- Red (Class C): <500 gpm
- Note: The NFPA's color code guide for fire hydrants is a standard, not a law. Cities don't have to abide by it and can technically paint their hydrant bonnets and barrels whatever colors they want. Learn more under "Do fire hydrants have to be painted a certain color?"
2
Red, yellow, or silver barrels signal whether a hydrant is public or private. NFPA 291 also calls for fire hydrant barrels to be painted certain colors to indicate whether they're for private or public use. According to the code, private fire hydrants should be painted bright red, and public hydrants should be painted chrome yellow. Yellow was chosen specifically because it's easy to see at night. So if a firefighting crew responds to a fire after sunset, they can easily spot the hydrants, no matter how dark it is.^{[2]
X
Research source}
- Note: Many cities use silver instead of chrome yellow for their public fire hydrants. This is acceptable because silver is reflective and shows up well in the dark.^{[3]
  X
  Research source}
Advertisement
3
Purple and black fire hydrant barrels are for non-standard hydrants. The NFPA recommends painting fire hydrants that are connected to non-potable water light purple (violet). Non-potable water hasn't been treated and isn't safe to drink, but can still be used for firefighting.^{[4]
X
Research source} An all-black fire hydrant is restricted, so firefighters aren't allowed to access it. If a fire hydrant has a black bonnet and/or nozzle caps, that means it's extremely low pressure, and firefighters probably want to avoid tapping into it.^{[5]
X
Research source}
- Other fire hydrant markings: A black bag over the top of a fire hydrant means it's temporarily out of order and can't be used.^{[6]
  X
  Research source} And if a fire hydrant uses water pressure above or below 20 PSI, the pressure amount is usually marked in black on top of the hydrant.^{[7]
  X
  Research source}

Section 2 of 4:

Why is the NFPA hydrant color code important?

Download Article

1
The bonnet color helps firefighters choose the right water flow for the fire's size. When a fire is burning, firefighters must decide quickly how much water they need access to for putting out the blaze. The NFPA bonnet color code helps firefighters assess at a glance how much water they can access with that hydrant. From there, they can decide best whether to connect their hose to that hydrant or find one with more water.^{[8]
X
Trustworthy Source

National Fire Protection Association
Nonprofit organization devoted to eliminating death, injury, property and economic loss due to fire, electrical and related hazards.

Go to source}
- In general, the bigger the fire, the more gallons per minute should come out of the hoses.
- Note: Firefighters might have to tap into multiple fire hydrants at once. It depends on the fire's size and how much water each hydrant provides.
2
The barrel color makes fire hydrants easier to spot at night. If firefighters are working at night, they need to be able to spot fire hydrants quickly, even if the street is dark. The NFPA recommends chrome yellow for public fire hydrant barrels because it's bright, reflective, and shows up well in low light.^{[9]
X
Research source}
- Can firefighters use private fire hydrants? Yes, firefighters can use private fire hydrants, which the NFPA standard requires to be painted red. They're useful when the source of the fire is on private property, and the nearest public hydrant is out of the fire hoses' reach.^{[10]
  X
  Research source}
  - With that in mind, firefighters usually try to use a public hydrant first. The property owner is also responsible for regularly maintaining and testing the hydrant.
If a local fire department is overwhelmed by a large fire, it might request volunteer firefighters from out of town to come and help battle the blaze. When that happens, the volunteers need to be able to assess the local fire hydrants for water flow, even if they've never been to that town before.

Section 3 of 4:

Do fire hydrants have to be painted a certain color?

Download Article

No, cities can paint their hydrants whatever color they want. The NFPA standard is strongly recommended, but it's not a law, so cities are free to decide whether they want to follow it. If they choose, they can paint their fire hydrants whatever color they want.^{[11]
X
Research source} That said, many cities across the U.S. have adopted the NFPA standard for consistency and to help firefighters do their job correctly.
- Some municipalities paint their fire hydrants specific colors to match a local school, college, or sports team.

Section 4 of 4:

How do fire hydrants work?

Download Article

Fire hydrants give firefighters access to water so they can fight fires. When a fire is blazing somewhere in the city, the firefighters bring their own water with them on their fire truck. But if that water isn't enough, they connect their hoses to the fire hydrant nearest the fire. They do so by removing the nozzle caps from the sides of the hydrant and attaching their hoses to the outlets. Then they turn the stem nut on top of the hydrant to open the water valve, so the water can flow up from the water pipes in the ground, out of the hydrant, and through their hoses.^{[12]
X
Research source}
- Did you know? Fire hydrants typically come with 2-3 outlets: two outlets for standard firefighter hoses, and one large outlet for the pumper hose, which can spray a larger amount of water.