Marathon refinery incident released more than 15 tons of pollutants: Reports
EL PASO, Texas (KVIA) — The Texas Commission on Environmental Quality released the final reports on two incidents at the Marathon Petroleum Refinery on Aug. 4-5. The reports said the refinery released more than 15 tons of pollutants.
In preliminary reports, the TCEQ said the refinery released three air contaminants: 1,3-butadiene, propylene and sulfur dioxide.
According to Tuesday’s reports, an electrical issue led to a shutdown and restart of the conversion process used in petroleum refineries (Fluid Catalytic Cracker, or FCC).
The first incident started Aug. 4 at 7:47 p.m. and ended Aug. 7 at 3:55 p.m. The report said intermittent flaring took place due to the FCC restart. It said flaring maintained safe operation.
During this time, the refinery released 20 air contaminant compounds, including more than 3,800 pounds of carbon monoxide and 1094.65 pounds of sulfur dioxide. The carbon monoxide was released at 58.88 lbs. per hour, the report said.
The report said sulfur scavenger material was injected into the flare header to decrease sulfur dioxide emissions. The flares ensured maximum destruction and removal by maintaining proper combustion, TCEQ said.
TCEQ Search Air Emission Event Reports Incident Details 1DownloadThe second incident started Aug. 4 at 8 p.m. and ended Aug. 5 at 3:30 a.m. Thirteen air contaminant compounds were released into the air, including 10,066.2 pounds of propylene.
The electrical issue led to hydrocarbons escaping through a floating roof rim seal, the report said.
To minimize emissions, diesel was added to “sponge” the hydrocarbons and redirect the flow to a different tank.
TCEQ Search Air Emission Event Reports Incident Details 2DownloadIn both reports, TCEQ said the report doesn’t reflect ground-level concentrations at or beyond the refinery’s fence line.
Additionally, Marathon’s air monitoring team monitored air quality through Aug. 10 and found that air quality levels were below established community exposure guidelines, the report said.
The reports said the investigation into the incidents are ongoing.
Texas State Senator Cesar Blanco said TCEQ will take the following steps now that it released the reports:
Marathon will submit a final emissions event report to TCEQ within two weeks of the incident after finishing its evaluation of the incident. TCEQ will review the final report and conduct an investigation, which could take at least 90 days. TCEQ will determine whether corrective, compliance or enforcement action is warranted, which could include penalties. Marathon’s compliance history and prior enforcement actions may factor into that determination. The separate air permit proceeding moves forward at the State Office of Administrative Hearings. It will start with a preliminary hearing and the contested case process.
“The latest findings released by the Texas Commission on Environmental Quality (TCEQ) following this month’s emissions event at Marathon are of major concern. Our community deserves answers, accountability, and a clear understanding of what happened,” Sen. Blanco said in a statement. “I will continue working with TCEQ to get answers, ensure appropriate accountability, and keep our community informed as additional information and findings become available.”
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(Courtesy: EPPD)



Instagram photo of Ruiz with what appears to be the same AR-15 style piston recovered from Mendoza on September 6, 2025(Courtesy: U.S. Attorney for the District of New Mexico)
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