PHMSA Finalizes Integrity-Management Alternative for Gas Pipeline Class Location Changes

What This Rule Does

The Pipeline and Hazardous Materials Safety Administration (PHMSA), part of the U.S. Department of Transportation, has finalized a rule updating how natural gas pipeline operators must respond when population growth around a pipeline triggers a "class location change" — a regulatory designation that reflects increased public safety risk due to more people living near the pipeline.

Under the old system, dating back to 1950s-era standards, operators facing a class location change had three options: reduce the pipeline's maximum allowable operating pressure (MAOP), conduct a new pressure test, or replace the pipeline with stronger materials. All three options are expensive, disruptive, and can result in natural gas emissions and service interruptions.

This final rule adds a fourth option: an integrity-management (IM) alternative that allows operators to use modern risk-assessment tools and ongoing monitoring programs to confirm or restore a pipeline's MAOP without resorting to pressure tests or replacements.

Background: What Is a Class Location Change?

Class locations (1 through 4) are ratings assigned to pipeline segments based on how many buildings for human occupancy exist nearby. As neighborhoods grow and more homes or businesses are built near a pipeline, the class location can increase — for example, from Class 2 to Class 3. A higher class location means stricter safety requirements, including lower allowable operating pressures, because more people could be harmed in an incident.

PHMSA has been granting individual "special permits" allowing operators to use the IM-based approach since the early 2000s. More than 45 operators have used these special permits, and no pipeline segment operating under a class location special permit has ever experienced a failure. This rule simply codifies that proven approach into the permanent regulations.

Who Is Eligible to Use the IM Alternative?

Not all pipelines qualify. To use the IM alternative, a gas transmission line segment must meet strict eligibility criteria. Segments are excluded from using this option if they:

• Contain bare pipe (pipe without protective coating)
• Contain wrinkle bends (a type of structural defect)
• Have a longitudinal seam formed by lap welding or another method with a joint factor below 1.0
• Have experienced an in-service leak or rupture due to cracking on the segment, or on a pipe with similar characteristics within 5 miles

Only segments that change to Class 3 locations are eligible under this rule.

What Operators Must Do

Operators choosing the IM alternative must comply with a comprehensive set of initial and recurring requirements:

Initial requirements (within 24 months):

• Conduct integrity assessments and remediate any identified issues
• Complete pressure testing
• Verify material records
• Install rupture mitigation valves
• Ensure adequate cathodic protection, pipe coating, and depth of cover
• Notify PHMSA that they are using the program

Ongoing (recurring) requirements:

• Monitor gas quality
• Conduct close interval surveys and leak surveys
• Patrol the line and maintain line markers
• Conduct class location studies
• Inspect shorted casings and exposed pipe/weld surfaces

Additionally, the MAOP of any segment using the IM alternative may not exceed a hoop stress corresponding to 72% of the pipe's specified minimum yield strength (SMYS) — the standard measure of how much internal pressure a pipe can safely handle.

Costs and Benefits

PHMSA projects the rule will generate substantial net savings. On an annualized basis, the agency estimates:

• $461 million in annual cost savings, after accounting for approximately $61.5 million in costs for operators to implement the IM alternative (both figures discounted at 7%)
• Avoidance of an estimated 1.3 billion cubic feet of natural gas losses per year that would otherwise result from pipeline replacements
• Additional non-quantified benefits including reduced service disruptions and greater regulatory certainty

Effective Date

This rule takes effect March 16, 2026. Comments related to the information collection provisions may be submitted through that same date.

Note for Visa Pulse Readers

This rule governs natural gas pipeline safety regulations and does not affect immigration policy, visa categories, or related processes. It is included here for readers who work in the energy sector or track federal regulatory activity broadly.