Tesoro Corp
2 facilities · 2 states · 5.5M lbs total releases
According to the EPA Toxics Release Inventory, Tesoro Corp is the reported parent of 2 Form R facilities across 2 states, disclosing 5.5M lbs of toxic releases. 14 of 77 reported chemicals carry a carcinogen classification in the TRI extract. The heaviest-reporting state by release volume is California (4.8M lbs). Those TRI figures remain self-reported disclosure pounds for Tesoro Corp, including carcinogen-flagged substances, not a measured public-health risk score.
Release-over-release change
What changed for Tesoro Corp: EPA TRI 2023 reporting year
Same facilities, both years
-19.9%
2 facilities that filed in 2022 and 2023
Whole inventory
-19.9%
1.4 million lb → 1.1 million lb, every facility that filed
- Tesoro Corp's total reported releases fell from 1.4 million lb in 2022 to 1.1 million lb in 2023, based on EPA TRI filings.
- Tesoro Corp's water releases rose from 179 lb in 2022 to 602 lb in 2023, based on EPA TRI filings.
- Tesoro Corp's land releases fell from 599 lb in 2022 to 401 lb in 2023, based on EPA TRI filings.
- Tesoro Corp's air releases fell from 1.2 million lb in 2022 to 943.4 thousand lb in 2023, based on EPA TRI filings.
TRI parent disclosure trail
Read Tesoro Corp from filing to facility
Largest Form R sites under this parent: Tesoro Los Angeles Refinery-Carson Operations; Tesoro Refining & Marketing Company LLC - Slc. Neighbor parents on the disclosure ladder: Clean Harbors Inc; Waste Management Inc; Quikrete Holdings; Valero Energy Corp. Largest disclosed chemicals by pounds: Ammonia; Methanol; Toluene; Zinc compounds; n-Hexane. Heaviest-reporting states in this extract: California; Utah. Industry labels on the parent rollup: Petroleum. 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: Tesoro Los Angeles Refinery-Carson Operations; Tesoro Refining & Marketing Company LLC - Slc. Neighbor parents on the disclosure ladder: Clean Harbors Inc; Waste Management Inc; Quikrete Holdings; Valero Energy Corp. Largest disclosed chemicals by pounds: Ammonia; Methanol; Toluene; Zinc compounds; n-Hexane. Heaviest-reporting states in this extract: California; Utah. Industry labels on the parent rollup: Petroleum.
Tesoro Corp ranks #248 of 4,988 slug-merged TRI parents by disclosed release pounds, mid-to-upper among parents, not a top-25 volume name. Tesoro Corp files across 2 states, a regional parent portfolio rather than a single-state discloser. Releases are facility-concentrated: Tesoro Los Angeles Refinery-Carson Operations accounts for most of Tesoro Corp's disclosed pounds, so peer comparisons should weight that site, not an even portfolio average.
Parent aggregation for Tesoro Corp follows facility-reported names. Compare the named neighbors (Clean Harbors Inc; Waste Management Inc; Quikrete Holdings) before treating rank as a hazard score; TRI stays self-reported and unweighted by toxicity.
Where Tesoro Corp sits among TRI parents
Tesoro Corp sits on a disclosure ladder beside Clean Harbors Inc and Waste Management Inc and Quikrete Holdings and Valero Energy Corp. Open those parents for a different facility count, state span, and chemical mix.
Higher disclosed volume
- Clean Harbors Inc · rank #246 · 52.2M lbs
- Waste Management Inc · rank #247 · 19.2M lbs
Lower disclosed volume
- Quikrete Holdings · rank #249 · 3.9M lbs
- Valero Energy Corp · rank #250 · 3.7M lbs
Largest chemicals disclosed by Tesoro Corp
Ammonia; Methanol; Toluene; Zinc compounds; n-Hexane lead the Form R pound rollup for this parent, including filings such as Tesoro Los Angeles Refinery-Carson Operations. Pound totals, not toxicity-weighted risk.
| Chemical | Disclosed lbs |
|---|---|
| Ammonia | 3.6M lbs |
| Methanol | 246.1K lbs |
| Toluene | 184.0K lbs |
| Zinc compounds | 150.1K lbs |
| n-Hexane | 141.7K lbs |
Where does this company operate?
| State | Facilities | Total Releases |
|---|---|---|
| California | 1 | 4.8M lbs |
| Utah | 1 | 668.7K lbs |
Facilities (2)
| Facility | Releases |
|---|---|
| Tesoro Los Angeles Refinery-Carson Operations Carson, CA | 4.8M lbs |
| Tesoro Refining & Marketing Company LLC - Slc Salt Lake City, UT | 668.7K lbs |
Frequently Asked Questions
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Compare beyond the release ladder
Nationwide peers by disclosed pounds & facility count
Cross-portfolio TRI parents nearest Tesoro Corp on total disclosed release pounds (5.5M lbs) and reporting facility count (2). Release-volume peers include Energizer Holdings Inc, Green Bay Packaging Inc, American Cast Iron Pipe Co. 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.
About This Data
EPA TRI parent totals cover all media. This extract's heaviest states for the parent are California, Utah; facility-reported names can vary across subsidiaries.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files
What to do with Tesoro Corp's TRI parent record
From Tesoro Corp, open Tesoro Los Angeles Refinery-Carson Operations or compare against Clean Harbors Inc rather than reading rank alone.
- Open the largest Form R site for Tesoro Corp (Tesoro Los Angeles Refinery-Carson Operations in CA). Largest facility
- Compare against Waste Management Inc, the next-higher disclosed-volume parent. Higher-volume parent
- Browse the full parent release ranking to see where Tesoro Corp sits among all slug-merged TRI parents. All parent companies
Rank and peers (Clean Harbors Inc, Waste Management Inc) are disclosure volume only, not toxicity-weighted risk or enforcement status.
Use and verify this record
Tesoro 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.