Have you ever been curious about what surveying markouts, including flags and spray paint, actually mean?
These color codes follow a guideline suggested by the American Public Works Association (APWA). Markouts have 6 main colors, and can be referred to as color systems, survey flag colors, or survey color codes. Even though there are multiple names for utility markouts, the meanings behind the color codes and what they are used for always remain the same.
The 6 main survey color codes are as follows:
- Red is used for electric power lines;
- Orange is used for telecommunications;
- Green is used for sewer and drain lines;
- Yellow is used for natural gas, oil, steam, and petroleum;
- Purple is used for unknown utilities; and
- Blue is used for potable water.
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