North Carolina Building Contractor License Practice Exam

What color is used to mark sewer lines?

1. Yellow

2. Purple

3. Blue

4. Green

The correct answer is: Green

Sewer lines are typically marked using the color green. This color designation is consistent with the American Public Works Association (APWA) color codes, which are widely recognized in construction and utility industries for identifying different types of buried utilities. The use of green for sewer lines helps to standardize marking practices, ensuring safety and clarity on job sites. Yellow is often used for gas lines, purple is used to indicate reclaimed water or irrigation lines, and blue generally signifies potable water lines. Therefore, recognizing that green is specifically assigned to sewer lines is crucial for contractors to avoid accidental damage to infrastructure while excavating or conducting other construction activities. Understanding and applying these color codes is essential for compliance with safety regulations and effective project management.