What Can I View?
The National Pipeline Mapping System (NPMS) Public Map Viewer enables
the user to view NPMS data one county at a time. NPMS data consists of
gas transmission pipelines and hazardous liquid trunklines.
It does not contain gathering or distribution pipelines, such as lines
which deliver gas to a customer's home. Therefore, not all pipelines in
an area will be visible in the Public Map Viewer. NPMS data is for
reference purposes only. It should never be used as a substitute for
contacting a one-call center prior to excavation activities.
Please call 811 before any digging occurs.
How Can I View It?
To view the data, select a state and then a county from the
drop-down lists below. To view another county, click the Log Out
button or close the Public Viewer window, return to the home page of
the NPMS website and click the NPMS Public Map Viewer button again.
Please note that the Public Viewer
limits the scale of pipeline maps, in accordance with PHMSA's
security policy. When you are zoomed in closer than a 1:24,000
scale (approximately 0.2 miles on the scale bar), you will notice
that the pipelines have disappeared from the map. In order to see
the pipelines, you must either zoom out or set the scale to
1:24,000 or a greater number. Data cannot be downloaded from the
You are accessing a U.S. Government information system, which
includes (1) this computer, (2) this computer network, (3) all
computers connected to this network, and (4) all devices and
storage media attached to this network or to a computer on this
network. This information system is provided for U.S.
Government-authorized use only.
Unauthorized or improper use of this system may result in
disciplinary action, as well as civil and criminal penalties.
By using this information system, you understand and consent to
You have no reasonable expectation of privacy regarding any
communications or data transiting or stored on this information
system. At any time, and for any lawful government purpose, the
government may monitor, intercept, and search and seize any
communication or data transiting or stored on this information
Any communications or data transiting or stored on this
information system may be disclosed or used for any lawful
Pipeline mileage shown in the mapping application may vary up to 10%, or in rare cases
, more than 10%, from pipeline mileage measured by other sources.