For Sewer and storm drainage systems, which color tag is used?

• A. Purple
• B. Green
• C. Pink
• D. White

Answer: (D)

In marking underground utilities, colors quickly convey what type of facility is present, helping crews identify and protect the right lines before digging. For sewer and storm drainage systems, the standard color used is green. Seeing green marks indicates sewer or drainage lines and related services, guiding excavators to take appropriate precautions and coordinate with the responsible utility owner.

As helpful context, other colors serve different utilities—blue for potable water, red for electric, yellow for gas, orange for communications, purple for reclaimed or irrigation water, and pink for temporary survey markings. White is commonly used for proposed excavation areas. Always check the specific project plan or local guidelines, since markings can vary by program.