The colors are part of the uniform color code for underground utility marking as recommended by the american public works association (apwa). “the apwa, through its utilities and public right of way committee, has developed and published guidelines for temporary marking of underground utilities which include an apwa uniform color code in order to minimize damages during excavation and similar operations in which the earth or the earth’s surface is moved, removed, or displaced.” Utility Marking Upisde Down Aerosol Paint Apwa Survey Line Colors White Aerosol Paint Painting Marking Paint Other colors such as purple and pink are sometimes used for unknown/unidentified underground utilities. Underground utility marking colors . Whenever utilities are located they are marked with these underground utility color codes: Pink = temporary survey markings. Australian colour codes for utilities: In an attempt to better educate the public, the government funded american public works as...