97% of decommissioned Gulf pipeline mileage stays on the seafloor
Summary
Two GAO reports, read together, trace how the federal government oversees offshore oil and gas infrastructure once it stops producing. In 2021, GAO found BSEE had let industry leave more than 97% of decommissioned pipeline mileage on the Gulf seafloor since the 1960s, with no inspection or monitoring once it's down there. In 2024, GAO found the same enforcement pattern applies to wells and platforms -- more than 75% of the Gulf's end-of-lease and idle infrastructure was overdue for decommissioning as of June 2023 -- and that the $3.5 billion in bonds BOEM holds covers as little as 5% of the $40 billion to $70 billion the government itself estimates decommissioning could cost.
Pipelines: leaving it in place became the norm, not the exception
doesn't conduct or require subsea inspections of the roughly 8,600 miles of active pipeline currently on the Gulf floor -- it relies on monthly surface observations and pressure sensors, which officials told aren't always reliable for catching ruptures. Once a pipeline is decommissioned, the gaps compound: doesn't thoroughly weigh the risks of leaving it in place when reviewing an operator's decommissioning application, doesn't observe the decommissioning work or inspect the pipeline afterward, and doesn't verify most of the evidence operators submit that they met cleaning standards. It also doesn't monitor a decommissioned-in-place pipeline's condition or location afterward -- and if one is later found to pose a risk, there's no funding source to remove it.
View data as table
| Left on the seafloor | 97 |
|---|---|
| Removed | 3 |
has known its pipeline rules were outdated since at least 2007, when it proposed an update addressing inspection and subsea leak-detection technology. That effort stalled. has said since 2013 that it plans to update the regulations, but found only limited progress in the years since. made one recommendation -- finish the update -- and Interior agreed.
Wells and platforms: the same pattern, quantified differently
's 2024 review found 's enforcement tools for well and platform deadlines don't function as real deterrents. Citations and compliance orders are essentially warnings; civil penalty fines are rare and can take years to impose; disqualifying a noncompliant operator has no clear trigger criteria. For Gulf leases that ended between 2010 and 2022, operators missed 's 1-year deadline for more than 40% of wells and 50% of platforms -- many still not decommissioned years later. As of June 2023, over 75% of end-of-lease and idle infrastructure in the Gulf was overdue: more than 2,700 wells and 500 platforms, together representing roughly 5% of every well and 7% of every platform the industry has ever installed offshore.
View data as table
| Wells | 40 |
|---|---|
| Platforms | 50 |
The financial backstop hasn't kept pace either. BOEM is supposed to require enough supplemental bonding to cover decommissioning if an operator defaults or goes bankrupt. As of June 2023, it held about $3.5 billion in such bonds against an estimated $40 billion to $70 billion in total decommissioning costs -- leaving the federal government exposed to the difference if operators walk away. BOEM has worked on proposals to fix this for more than a decade without finalizing changes, and its operator-qualification standards still don't screen for decommissioning capacity or a history of missed obligations.
View data as table
| Supplemental bonds BOEM held | 3.5 |
|---|---|
| Estimated total costs (low end) | 40 |
| Estimated total costs (high end) | 70 |
made four recommendations to Interior in 2024: strengthen 's proactive enforcement of deadlines, finish updating decommissioning regulations, finish updating financial-assurance rules including higher bonding requirements, and revise operator-qualification standards to weigh decommissioning capacity and compliance history. Interior concurred with all four. also suggested Congress consider requiring annual reporting on decommissioning enforcement and liabilities, given how long the problems have persisted.
The takeaway
- Leaving offshore infrastructure in place, not removing it, is the default outcome. 97% of decommissioned pipeline mileage stays on the Gulf floor; more than 75% of the Gulf's end-of-lease and idle wells and platforms were overdue for decommissioning as of June 2023.
- The enforcement tools that exist barely function as deterrents. doesn't inspect decommissioned pipelines or verify most cleanup evidence; its citations and orders for wells and platforms are essentially warnings, and disqualifying a repeat offender has no clear trigger.
- If operators default, the bonds on file don't come close to covering the bill. $3.5 billion in bonds against a $40-70 billion estimated total cost means the federal government -- not industry -- would absorb most of the difference.
The pipeline findings are from -21-293, 'Offshore Oil and Gas: Updated Regulations Needed to Improve Pipeline Oversight and Decommissioning' (March 19, 2021), read directly and in full via an archived copy. The wells-and-platforms findings are from -24-106229, 'Offshore Oil and Gas: Interior Needs to Improve Decommissioning Enforcement and Mitigate Related Risks' (January 25, 2024), also read directly and in full. Both reports were directed by the same official (Frank Rusco) and examine distinct facets of the same offshore decommissioning oversight system -- pipelines in 2021, wells/platforms and financial assurance in 2024 -- about 2.85 years apart.
Sources(2) ▾
- U.S. Government Accountability Office, Offshore Oil and Gas: Updated Regulations Needed to Improve Pipeline Oversight and Decommissioning (2021-03-19) — -21-293, a report to congressional requesters examining 's oversight of active offshore pipelines and pipeline decommissioning specifically -- the pipelines facet. Distinct from doc-gao24-106229 (the wells-and-platforms decommissioning-enforcement facet), issued about 2.85 years later; both were directed by the same director. Direct gao.gov fetch returned HTTP 403; fetched via an existing Wayback capture. gao.gov · original document
- U.S. Government Accountability Office, Offshore Oil and Gas: Interior Needs to Improve Decommissioning Enforcement and Mitigate Related Risks (2024-01-25) — -24-106229, a report to congressional requesters examining Interior's enforcement of decommissioning deadlines for offshore wells and platforms and financial-assurance adequacy -- the wells-and-platforms facet. Distinct from doc-gao21-293 (the pipelines-specific facet), issued about 2.85 years later; both were directed by the same director. Direct gao.gov fetch returned HTTP 403; fetched via an existing Wayback capture. gao.gov · original document
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Since the 1940s, the offshore oil and gas industry has installed roughly 40,000 miles of pipeline, more than 55,000 wells, and over 7,000 platforms in federal waters, mostly in the Gulf of Mexico. When a well, platform, or pipeline reaches the end of its life, federal rules generally require the operator to decommission it -- plug the well, remove the structure, clear the pipeline -- within a year. In March 2021⧉, examined how the Bureau of Safety and Environmental Enforcement () handles pipelines specifically and found it had authorized industry to leave more than 97% of all decommissioned pipeline mileage on the seafloor since the 1960s. In January 2024⧉, turned to wells and platforms and found a parallel enforcement gap, plus a financial one: BOEM's $3.5 billion in bonds against an estimated $40 billion to $70 billion decommissioning bill.