Welcome to the NPMS Public Map Viewer

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 Public Viewer.

Terms of Use
  • 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 the following:
    • 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 system.
    • Any communications or data transiting or stored on this information system may be disclosed or used for any lawful government purpose.
    • 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.