Utility Location
Color-coding
Yellow spray paint indicating below-street gas utility line. New York city, 2007.
Utility color codes are used for identifying existing underground utilities in construction areas with the intent of protecting them from damage during excavation.
Public utility systems are often run underground; some by the very nature of their function, others for convenience or aesthetics. Before digging, local governments often require that the underground systems’ locations be denoted and approved, if it is to be in the public right-of-way.
Colored lines and/or flags are used to mark the location and denote the type of underground utility. A special type of spray paint, which works when the can is upside-down, is used to mark lines, often in a fluorescent color. On flags, a logo often identifies the company or municipal utility which the lines belong to, or an advertisement for a company which has installed an irrigation system for lawns or gardens. In this case, each sprinkler head is usually marked, so that landscaping crews will not cover or bury them with soil or sod, or damage them with tractors or other construction equipment while digging holes for trees, shrubs, or other large plants or fenceposts. This is also important because a vehicle (tractor, truck, or otherwise) can break a sprinkler or the hard-PVC pipe or joint it is mounted on simply by driving over it, particularly on newly-moved soil which is uncompacted and therefore unsupportive of such weight.
The American Public Works Association (APWA) Uniform Color Codes for temporary marking of underground utilities are listed below:
Red
electric power lines, cables, conduit, and lighting cables
Orange
telecommunication, alarm or signal lines, cables, or conduit
Yellow
natural gas, oil, steam, petroleum, or other gaseous or flammable material
Green
sewers and drain lines
Blue
drinking water
Violet
reclaimed water, irrigation, and slurry lines
Pink
temporary survey markings, unknown/unidentified facilities
White
proposed excavation limits or route
References
Technology Transfer Information Center. “Statement of Need: Utility Locating Technologies”. Accessed October 31, 2007.
See also
Underground Service Alert
DigNet
External links
Common Ground Alliance
American Public Works Association
APWA Recommended Marking Guidelines For Underground Utilities (PDF)
Rhino Marking & Protection Systems
State Utility Location Service Contact Numbers
Underground Utility Locating Forum
Categories: Color codes | Public utilities | Subterranea
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