Gas Pipeline MarkersDig Safely Home< BackNext >


Markers indicate the general location of our high-pressure natural gas transmission pipelines.
These markers are usually found at roadways, railroad crossings and other points along the pipeline route. They are placed near pipelines but not necessarily on top of them, and pipelines may not follow a straight course between markers.

Pipeline markers and maps do not show gas distribution main lines or service lines.
Never use them as a substitute for notifying 811 to have all utility lines in your dig area located and marked.

Working within 15 feet of a high-pressure natural gas transmission pipeline or other critical facility requires special arrangements.
Prior to digging, you are required to attend an onsite meeting and/or have contact with qualified National Grid representatives to help reduce the risk of excavation-related damage. National Grid MUST be onsite during the excavation.


Yellow and black markers show the general location of our high-pressure gas pipelines.