§24C-1-6. Standard color code for temporary markings.
Temporary marking provided by operators and excavators to indicate the approximate location of underground facilities and work site boundaries shall utilize the following color code:

Facility Type Identifying Color or Equivalent

(a) Electrical powerSafety Red

distribution and

transmission

(b) Municipal electricSafety Red

systems

(c) Gas distribution andHigh Visibility Safety Yellow

transmission

(d) Oil and petroleumHigh Visibility Safety Yellow

transmission

(e) Dangerous materials,High Visibility Safety Yellow

product lines, steam

lines

(f) Telephone and telegraphSafety Alert Orange

systems

(g) Police and fireSafety Alert Orange

communications

(h) Cable televisionSafety Alert Orange

(i) Water systemsSafety Precaution Blue

(j) Slurry systems Safety Precaution Blue

(k) Sewer systemsSafety Green

(l) Proposed excavationsWhite