The NPMS Public Map Viewer enables the user to view National Pipeline Mapping System (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."