Which color marks water systems according to standard utility markings?

Which color marks water systems according to standard utility markings?

• A. Red
• B. Yellow
• C. Blue
• D. Purple

Answer: (C)

Blue marks indicate potable water supply lines. This color-coding system is used on job sites to quickly identify what type of underground utility is present, helping workers avoid damaging water mains. Other colors map to different utilities: red for electric, yellow for gas/oil/steam, purple for reclaimed water or irrigation, green for sewer, orange for communications, and pink for temporary survey. The key idea is that blue is specifically designated for water systems, which is why it’s the best choice here.

Blue marks indicate potable water supply lines. This color-coding system is used on job sites to quickly identify what type of underground utility is present, helping workers avoid damaging water mains. Other colors map to different utilities: red for electric, yellow for gas/oil/steam, purple for reclaimed water or irrigation, green for sewer, orange for communications, and pink for temporary survey. The key idea is that blue is specifically designated for water systems, which is why it’s the best choice here.