The APWA uses a uniform color code for marking underground lines in ... including markings that identify the location of subsurface utilities, lines and similar facilities, markings that identify ...

The American Public Works Association Uniform Color Codes for temporary marking of underground utilities are: Gerri Boyce, JEA spokeswoman, confirmed that the color codes as listed are correct.

Other uniform color codes by the American Public Works Association for identifying utility conduits include red for electric power lines, cables, conduit and lighting cables; yellow for gas ...

But what do those utility flags really mean? According to the American Public Works Association uniform color code guidelines, the following colors signify the types of utilities: ...