Irrigation & Utility Marking Flags

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Marking Flag Colors

Sprinkler Warehouse offers several different variations of marking flags, but did you know that each color has significance? Based on the color of the flag you see, you can get an idea of what’s being marked underneath.

Red - Electric power lines, cables, conduit, and lighting cables
Yellow - Gas, oil, steam, petroleum, or other gaseous materials
Orange - Communication, alarm, or signal lines
Blue - Potable water lines
Green - Sewer and drain lines
Purple - Reclaimed water, irrigation, and slurry lines
Pink - Temporary survey markings
White - Proposed excavation sites

Marking Flag FAQs

Are irrigation marking flags reusable?

Yes. Most marking flags can be used multiple times before disposing of them. Just remember to remove them gently after you’re finished with them. Over time, metal sprinkler flags may rust or bend, making reinsertion difficult. Just try to keep them dry and avoid excessive bending when inserting or removing them.

What color utility flags should mark sprinkler heads?

Blue utility flags should be used to mark sprinkler heads because blue represents potable (drinking) water lines, which include irrigation systems. This will help prevent accidental damage to your sprinklers during any landscaping or construction projects.

How far apart should I place marking flags when mapping an irrigation system?

You’ll generally want to place one lawn marking flag at each sprinkler head to clearly mark its location. Aside from that, the frequency of marking flags will depend on the system's complexity and terrain. You can usually get away with placing lawn marking flags every 10–20 feet along the main water line.

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