OCFA Securing Utilities Practice Test

Which statement about gas line color coding is true?

Blue is used for newer gas line identification Orange/Beige/Salmon are used for newer gas line identification Yellow is used for newer gas line identification Green is used for newer gas line identification

Correct Answer:

Yellow is used for newer gas line identification

Explanation:

Color coding of underground utilities uses distinct colors to signal what’s buried, so workers can identify lines at a glance and stay safe. For gas lines, yellow is the standard marker because it is highly visible and widely adopted across codes to indicate flammable gas. When newer gas line installations are identified, yellow helps differentiate them from older markings and from other utilities. That’s why this statement is the best one: yellow specifically flags gas lines, aligning with common safety color conventions. Other colors map to different utilities—blue for water, green for sewer, and orange-related markings for other services—so they don’t indicate newer gas lines. Always verify markings with utility maps and call before digging.

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