Marathon Petroleum Corp
124 facilities · 27 states · 36.9M lbs total releases
According to the EPA Toxics Release Inventory, Marathon Petroleum Corp is the reported parent of 124 Form R facilities across 27 states, disclosing 36.9M lbs of toxic releases. 16 of 1,402 reported chemicals carry a carcinogen classification in the TRI extract. The heaviest-reporting state by release volume is Texas (23.8M lbs). Those TRI figures remain self-reported disclosure pounds for Marathon Petroleum Corp, including carcinogen-flagged substances, not a measured public-health risk score.
Release-over-release change
What changed for Marathon Petroleum Corp: EPA TRI 2023 reporting year
Same facilities, both years
+28.6%
92 facilities that filed in 2022 and 2023
Whole inventory
+28.7%
8.0 million lb → 10.3 million lb, every facility that filed
Between the two reporting years, 7 facilities filed for the first time and 8 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Marathon Petroleum Corp's total reported releases rose from 8.0 million lb in 2022 to 10.2 million lb in 2023, based on EPA TRI filings.
- Marathon Petroleum Corp's off-site transfers rose from 611.8 thousand lb in 2022 to 1.2 million lb in 2023, based on EPA TRI filings.
- Marathon Petroleum Corp's land releases rose from 3.3 million lb in 2022 to 5.5 million lb in 2023, based on EPA TRI filings.
- Marathon Petroleum Corp's air releases fell from 3.4 million lb in 2022 to 2.9 million lb in 2023, based on EPA TRI filings.
TRI parent disclosure trail
Read Marathon Petroleum Corp from filing to facility
Largest Form R sites under this parent: Blanchard Refining Co LLC; Marathon Petroleum Co LP; Marathon Mandan Refinery; Catlettsburg Refining LLC. Neighbor parents on the disclosure ladder: Targa Resources Corp; Ineos US I Inc; Valero Energy Corp; Republic Services Inc. Largest disclosed chemicals by pounds: Hydrogen sulfide; Ammonia; Nitrate compounds (water dissociable; reportable only when in aqueous solution); Hydrogen cyanide; Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size). Heaviest-reporting states in this extract: Texas; Louisiana; North Dakota. Industry labels on the parent rollup: Petroleum; Natural Gas Processing; Petroleum Bulk Terminals; Food. Start from those named sites and neighbors rather than a generic parent blurb; pounds stay disclosure, not risk.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files Toxics Release Inventory (TRI) · August 2026
Largest Form R sites under this parent: Blanchard Refining Co LLC; Marathon Petroleum Co LP; Marathon Mandan Refinery; Catlettsburg Refining LLC. Neighbor parents on the disclosure ladder: Targa Resources Corp; Ineos US I Inc; Valero Energy Corp; Republic Services Inc. Largest disclosed chemicals by pounds: Hydrogen sulfide; Ammonia; Nitrate compounds (water dissociable; reportable only when in aqueous solution); Hydrogen cyanide; Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size). Heaviest-reporting states in this extract: Texas; Louisiana; North Dakota. Industry labels on the parent rollup: Petroleum; Natural Gas Processing; Petroleum Bulk Terminals; Food.
Marathon Petroleum Corp ranks #55 of 4,988 slug-merged TRI parents by disclosed release pounds, mid-to-upper among parents, not a top-25 volume name. Marathon Petroleum Corp spans 27 states in this extract, placing it among the broader national TRI parent footprints. Marathon Petroleum Corp's disclosed pounds are spread across 124 facilities, no single site dominates the parent total in this extract.
Parent aggregation for Marathon Petroleum Corp follows facility-reported names. Compare the named neighbors (Targa Resources Corp; Ineos US I Inc; Valero Energy Corp) before treating rank as a hazard score; TRI stays self-reported and unweighted by toxicity.
Where Marathon Petroleum Corp sits among TRI parents
Marathon Petroleum Corp sits on a disclosure ladder beside Targa Resources Corp and Ineos US I Inc and Valero Energy Corp and Republic Services Inc. Open those parents for a different facility count, state span, and chemical mix.
Higher disclosed volume
- Targa Resources Corp · rank #53 · 105.5M lbs
- Ineos US I Inc · rank #54 · 94.2M lbs
Lower disclosed volume
- Valero Energy Corp · rank #56 · 35.2M lbs
- Republic Services Inc · rank #57 · 34.6M lbs
Largest chemicals disclosed by Marathon Petroleum Corp
Hydrogen sulfide; Ammonia; Nitrate compounds (water dissociable; reportable only when in aqueous solution); Hydrogen cyanide; Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) lead the Form R pound rollup for this parent, including filings such as Blanchard Refining Co LLC. Pound totals, not toxicity-weighted risk.
| Chemical | Disclosed lbs |
|---|---|
| Hydrogen sulfide | 10.7M lbs |
| Ammonia | 7.3M lbs |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 3.7M lbs |
| Hydrogen cyanide | 2.1M lbs |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 2.0M lbs |
Where does this company operate?
| State | Facilities | Total Releases |
|---|---|---|
| Texas | 5 | 23.8M lbs |
| Louisiana | 2 | 3.7M lbs |
| North Dakota | 7 | 2.4M lbs |
| Kentucky | 10 | 1.6M lbs |
| Wyoming | 2 | 1.1M lbs |
| Minnesota | 1 | 945.3K lbs |
| Michigan | 9 | 885.6K lbs |
| Washington | 4 | 746.3K lbs |
| Ohio | 20 | 486.4K lbs |
| New Mexico | 3 | 342.3K lbs |
| Alaska | 3 | 278.3K lbs |
| Oklahoma | 3 | 129.5K lbs |
| California | 13 | 83.7K lbs |
| Indiana | 6 | 79.8K lbs |
| Florida | 3 | 73.6K lbs |
| West Virginia | 5 | 48.4K lbs |
| Pennsylvania | 6 | 42.9K lbs |
| Tennessee | 6 | 41.7K lbs |
| Illinois | 3 | 31.0K lbs |
| Georgia | 4 | 22.8K lbs |
| Idaho | 1 | 18.4K lbs |
| New York | 1 | 13.4K lbs |
| North Carolina | 2 | 11.8K lbs |
| Alabama | 2 | 11.0K lbs |
| Utah | 1 | 9.9K lbs |
| Arizona | 1 | 2.5K lbs |
| Nevada | 1 | 105 lbs |
Facilities (124)
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Compare beyond the release ladder
Nationwide peers by disclosed pounds & facility count
Cross-portfolio TRI parents nearest Marathon Petroleum Corp on total disclosed release pounds (36.9M lbs) and reporting facility count (124). Release-volume peers include McCain Foods USA Inc, Eastman Chemical Co, Pbf Energy Inc. Facility-count peers include Tyson Foods Inc, Martin Marietta Materials Inc, Clean Harbors Inc. Neighborhoods are forced disjoint so each axis surfaces a different set of parents.
Similar disclosed release pounds
Nearest parents (≥3 facilities, ≥10k lbs) by absolute TRI disclosed pounds, not rank-adjacent ladder neighbors.
Similar facility count
Nearest parents by reporting-site count (deduped against the release-pound neighborhood).
About This Data
EPA TRI parent totals cover all media. This extract's heaviest states for the parent are Texas, Louisiana, North Dakota; facility-reported names can vary across subsidiaries.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files
What to do with Marathon Petroleum Corp's TRI parent record
From Marathon Petroleum Corp, open Blanchard Refining Co LLC or compare against Targa Resources Corp rather than reading rank alone.
- Open the largest Form R site for Marathon Petroleum Corp (Blanchard Refining Co LLC in TX). Largest facility
- Compare against Ineos US I Inc, the next-higher disclosed-volume parent. Higher-volume parent
- Browse the full parent release ranking to see where Marathon Petroleum Corp sits among all slug-merged TRI parents. All parent companies
Rank and peers (Targa Resources Corp, Ineos US I Inc) are disclosure volume only, not toxicity-weighted risk or enforcement status.
Use and verify this record
Marathon Petroleum Corp's record groups disclosed TRI parent-company filings so readers can compare reporting context without treating the total as a measure of risk.
Company release figures are computed directly from EPA Toxic Release Inventory data; source names and the record-linking method are documented in the methodology.
Primary sources
- EPA Toxics Release Inventory Basic Data Files - annual facility-level chemical-release disclosures
PlainEnviro renders public EPA records directly from its data pipeline; no figure on this page is typed in by an editor. See the editorial standards and corrections policy for how source changes and reported errors are handled.