Pipeline Integrity Management Program

As your local natural gas provider, we want you to know everything we do to ensure the safety of our pipeline system.

NW Natural has one of the most modern pipeline systems in the nation. With the support of regulators and customer advocates, we were one of the first utilities in the nation to replace all of the known cast iron and bare steel in our system.

At NW Natural, the integrity of our pipeline system is a top priority. Watch the following video to learn how system integrity is a part of our jobs every day.


NW Natural has a “Pipeline Integrity Management Program” in place, which identifies: pipeline segments to be assessed; methods selected to assess each pipeline segment; the basis for selecting each assessment method; and a priority based schedule for completing the assessment.

NW Natural will select the method(s) best suited to address the issues identified in each segment. They include: internal inspection tools; pressure tests; direct assessments (a process that includes data gathering, indirect examination, direct examination, and post-assessment evaluation; and other proven technologies.

Pipelines are the most efficient and safe method by which to transport and deliver natural gas, and they are inherently safer than other modes of transportation, such as rail, barge and truck.

While the amount of natural gas being used in the U.S. continues to increase, the industry’s safety performance in recent years has improved significantly and serious accidents are rare.

Pipelines help ensure a plentiful supply of natural gas to heat homes and businesses, and to generate electricity.

NW Natural delivers gas to homes and businesses with safety as our number one priority. As part of our advanced safety and pipeline integrity programs, and as required by federal law, our employees and authorized contractors conduct about 250,000 routine walking surveys a year.