Oneok Inc
15 facilities · 5 states · 32.8M lbs total releases
According to the EPA Toxics Release Inventory, Oneok Inc is the reported parent of 15 Form R facilities across 5 states, disclosing 32.8M lbs of toxic releases. 6 of 63 reported chemicals carry a carcinogen classification in the TRI extract. The heaviest-reporting state by release volume is North Dakota (27.1M lbs). Those TRI figures remain self-reported disclosure pounds for Oneok Inc, including carcinogen-flagged substances, not a measured public-health risk score.
Release-over-release change
What changed for Oneok Inc: EPA TRI 2023 reporting year
Same facilities, both years
-11.0%
14 facilities that filed in 2022 and 2023
Whole inventory
-11.0%
17.3 million lb → 15.4 million lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Oneok Inc's total reported releases fell from 17.3 million lb in 2022 to 15.4 million lb in 2023, based on EPA TRI filings.
- Oneok Inc's off-site transfers rose from 112.2 thousand lb in 2022 to 208.8 thousand lb in 2023, based on EPA TRI filings.
- Oneok Inc's air releases rose from 164.9 thousand lb in 2022 to 208.0 thousand lb in 2023, based on EPA TRI filings.
- Oneok Inc's land releases fell from 17.0 million lb in 2022 to 15.0 million lb in 2023, based on EPA TRI filings.
TRI parent disclosure trail
Read Oneok Inc from filing to facility
Largest Form R sites under this parent: Oneok Rockies Midstream LLC - Grasslands Gas Plant; Oneok Hydrocarbon LP - Bushton Complex; Canadian Valley Gas Plant; Magellan Processing L.P.. Neighbor parents on the disclosure ladder: Basin Electric; Minnkota Power Cooperative Inc; Remc Assets LP. Largest disclosed chemicals by pounds: Hydrogen sulfide; Methanol; n-Hexane; Benzene; Formaldehyde. Heaviest-reporting states in this extract: North Dakota; Kansas; Oklahoma. Industry labels on the parent rollup: Natural Gas Processing; Petroleum; Chemicals. 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: Oneok Rockies Midstream LLC - Grasslands Gas Plant; Oneok Hydrocarbon LP - Bushton Complex; Canadian Valley Gas Plant; Magellan Processing L.P.. Neighbor parents on the disclosure ladder: Basin Electric; Minnkota Power Cooperative Inc; Remc Assets LP. Largest disclosed chemicals by pounds: Hydrogen sulfide; Methanol; n-Hexane; Benzene; Formaldehyde. Heaviest-reporting states in this extract: North Dakota; Kansas; Oklahoma. Industry labels on the parent rollup: Natural Gas Processing; Petroleum; Chemicals.
Oneok Inc ranks #61 of 4,988 slug-merged TRI parents by disclosed release pounds, mid-to-upper among parents, not a top-25 volume name. Oneok Inc files across 5 states, a regional parent portfolio rather than a single-state discloser. Releases are facility-concentrated: Oneok Rockies Midstream LLC - Grasslands Gas Plant accounts for most of Oneok Inc's disclosed pounds, so peer comparisons should weight that site, not an even portfolio average.
Parent aggregation for Oneok Inc follows facility-reported names. Compare the named neighbors (Basin Electric; Minnkota Power Cooperative Inc; Remc Assets LP) before treating rank as a hazard score; TRI stays self-reported and unweighted by toxicity.
Where Oneok Inc sits among TRI parents
Oneok Inc sits on a disclosure ladder beside Basin Electric and Minnkota Power Cooperative Inc and Remc Assets LP. Open those parents for a different facility count, state span, and chemical mix.
Higher disclosed volume
- Basin Electric · rank #59 · 167.8M lbs
Lower disclosed volume
- Minnkota Power Cooperative Inc · rank #62 · 27.5M lbs
- Remc Assets LP · rank #63 · 14.5M lbs
Largest chemicals disclosed by Oneok Inc
Hydrogen sulfide; Methanol; n-Hexane; Benzene; Formaldehyde lead the Form R pound rollup for this parent, including filings such as Oneok Rockies Midstream LLC - Grasslands Gas Plant. Pound totals, not toxicity-weighted risk.
| Chemical | Disclosed lbs |
|---|---|
| Hydrogen sulfide | 26.8M lbs |
| Methanol | 5.2M lbs |
| n-Hexane | 470.8K lbs |
| Benzene | 81.3K lbs |
| Formaldehyde | 52.5K lbs |
Where does this company operate?
| State | Facilities | Total Releases |
|---|---|---|
| North Dakota | 6 | 27.1M lbs |
| Kansas | 3 | 5.2M lbs |
| Oklahoma | 2 | 275.2K lbs |
| Texas | 3 | 173.8K lbs |
| Wyoming | 1 | 11.7K lbs |
Facilities (15)
| Facility | Releases |
|---|---|
| Oneok Rockies Midstream LLC - Grasslands Gas Plant Alexander, ND | 26.9M lbs |
| Oneok Hydrocarbon LP - Bushton Complex Bushton, KS | 5.2M lbs |
| Canadian Valley Gas Plant Calumet, OK | 173.8K lbs |
| Magellan Processing L.P. Corpus Christi, TX | 124.8K lbs |
| Oneok Field Svc/maysville Gas Plt Maysville, OK | 101.4K lbs |
| Garden Creek Gas Plant Watford City, ND | 56.0K lbs |
| Demicks Lake Gas Plant Watford City, ND | 49.3K lbs |
| Oneok Hydrocarbon L.P. - Mont Belvieu Ngl Fractionation (mb Baytown, TX | 45.8K lbs |
| Bear Creek Gas Plant Killdeer, ND | 32.4K lbs |
| Lonesome Creek Gas Plant Alexander, ND | 28.1K lbs |
| Stateline Complex Williston, ND | 24.9K lbs |
| Sage Creek Gas Plant Glenrock, WY | 11.7K lbs |
| Oneok Hydrocarbon L.P. - Hutchinson Fractionation Facility Hutchinson, KS | 11.2K lbs |
| Mont Belvieu Fractionator Mont Belvieu, TX | 3.3K lbs |
| Oneok Hydrocarbon LP McPherson Butane Isomerization Plant Mcpherson, KS | 0 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 Oneok Inc on total disclosed release pounds (32.8M lbs) and reporting facility count (15). Release-volume peers include Sabic US Holdings LP, Perdue Farms Inc, Energy Transfer Partners LP. Facility-count peers include Bae Systems Inc, Bridgestone Americas Inc, Clarios LLC. 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 North Dakota, Kansas, Oklahoma; facility-reported names can vary across subsidiaries.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files
What to do with Oneok Inc's TRI parent record
From Oneok Inc, open Oneok Rockies Midstream LLC - Grasslands Gas Plant or compare against Basin Electric rather than reading rank alone.
- Open the largest Form R site for Oneok Inc (Oneok Rockies Midstream LLC - Grasslands Gas Plant in ND). Largest facility
- Compare against Basin Electric, the next-higher disclosed-volume parent. Higher-volume parent
- Browse the full parent release ranking to see where Oneok Inc sits among all slug-merged TRI parents. All parent companies
Rank and peers (Basin Electric, Minnkota Power Cooperative Inc) are disclosure volume only, not toxicity-weighted risk or enforcement status.
Use and verify this record
Oneok Inc'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.