Mdu Resources Group Inc
20 facilities · 7 states · 1.3M lbs total releases
According to the EPA Toxics Release Inventory, Mdu Resources Group Inc is the reported parent of 20 Form R facilities across 7 states, disclosing 1.3M lbs of toxic releases. 3 of 68 reported chemicals carry a carcinogen classification in the TRI extract. The heaviest-reporting state by release volume is North Dakota (1.1M lbs). Those TRI figures remain self-reported disclosure pounds for Mdu Resources Group Inc, including carcinogen-flagged substances, not a measured public-health risk score.
Release-over-release change
What changed for Mdu Resources Group Inc: EPA TRI 2023 reporting year
Same facilities, both years
-19.8%
7 facilities that filed in 2022 and 2023
Whole inventory
-99.4%
44.8 thousand lb → 273 lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Mdu Resources Group Inc's total reported releases fell from 340 lb in 2022 to 273 lb in 2023, based on EPA TRI filings.
- Mdu Resources Group Inc's land releases fell from 218 lb in 2022 to 123 lb in 2023, based on EPA TRI filings.
- Mdu Resources Group Inc's off-site transfers rose from 120 lb in 2022 to 148 lb in 2023, based on EPA TRI filings.
- Mdu Resources Group Inc's chemicals reported fell from 6 in 2022 to 5 in 2023, based on EPA TRI filings.
TRI parent disclosure trail
Read Mdu Resources Group Inc from filing to facility
Largest Form R sites under this parent: Rm Heskett Station; Lewis & Clark Station; Knife River Cheyenne; Mdu Resources Roseburg Asphalt. Neighbor parents on the disclosure ladder: Basin Electric; Minnkota Power Cooperative Inc; American Crystal Sugar Co; Cargill Inc. Largest disclosed chemicals by pounds: Barium compounds (except for barium sulfate (CAS No. 7727-43-7)); Zinc compounds; Manganese compounds; Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size); Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size). Heaviest-reporting states in this extract: North Dakota; Montana; Oregon. Industry labels on the parent rollup: Electric Utilities; Petroleum; Nonmetallic Mineral Product. Start from those named sites and neighbors rather than a generic parent blurb; pounds stay disclosure, not risk.
Largest Form R sites under this parent: Rm Heskett Station; Lewis & Clark Station; Knife River Cheyenne; Mdu Resources Roseburg Asphalt. Neighbor parents on the disclosure ladder: Basin Electric; Minnkota Power Cooperative Inc; American Crystal Sugar Co; Cargill Inc. Largest disclosed chemicals by pounds: Barium compounds (except for barium sulfate (CAS No. 7727-43-7)); Zinc compounds; Manganese compounds; Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size); Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size). Heaviest-reporting states in this extract: North Dakota; Montana; Oregon. Industry labels on the parent rollup: Electric Utilities; Petroleum; Nonmetallic Mineral Product.
Mdu Resources Group Inc ranks #555 of 4,988 slug-merged TRI parents, a smaller disclosed-volume parent relative to the national Form R parent set. Mdu Resources Group Inc spans 7 states in this extract, placing it among the broader national TRI parent footprints. Releases are facility-concentrated: Rm Heskett Station accounts for most of Mdu Resources Group Inc's disclosed pounds, so peer comparisons should weight that site, not an even portfolio average.
Parent aggregation for Mdu Resources Group Inc follows facility-reported names. Compare the named neighbors (Basin Electric; Minnkota Power Cooperative Inc; American Crystal Sugar Co) before treating rank as a hazard score; TRI stays self-reported and unweighted by toxicity.
Where Mdu Resources Group Inc sits among TRI parents
Mdu Resources Group Inc sits on a disclosure ladder beside Basin Electric and Minnkota Power Cooperative Inc and American Crystal Sugar Co and Cargill Inc. Open those parents for a different facility count, state span, and chemical mix.
Higher disclosed volume
- Basin Electric · rank #553 · 167.8M lbs
- Minnkota Power Cooperative Inc · rank #554 · 27.5M lbs
Lower disclosed volume
- American Crystal Sugar Co · rank #556 · 1.1M lbs
- Cargill Inc · rank #557 · 1.0M lbs
Largest chemicals disclosed by Mdu Resources Group Inc
Barium compounds (except for barium sulfate (CAS No. 7727-43-7)); Zinc compounds; Manganese compounds; Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size); Hydrochloric 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 Rm Heskett Station. Pound totals, not toxicity-weighted risk.
| Chemical | Disclosed lbs |
|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 740.9K lbs |
| Zinc compounds | 300.4K lbs |
| Manganese compounds | 140.5K lbs |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 113.2K lbs |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 17.6K lbs |
Where does this company operate?
| State | Facilities | Total Releases |
|---|---|---|
| North Dakota | 2 | 1.1M lbs |
| Montana | 1 | 263.5K lbs |
| Oregon | 7 | 2.2K lbs |
| Wyoming | 2 | 1.3K lbs |
| Minnesota | 6 | 1 lbs |
| Idaho | 1 | 0 lbs |
| South Dakota | 1 | 0 lbs |
Facilities (20)
Frequently Asked Questions
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Compare beyond the release ladder
Nationwide peers by disclosed pounds & facility count
Cross-portfolio TRI parents nearest Mdu Resources Group Inc on total disclosed release pounds (1.3M lbs) and reporting facility count (20). Release-volume peers include Mohawk Industries Inc, Park Ohio Holdings Corp, Bway Holding Co. Facility-count peers include Dominion Energy Inc, Evonik Corp, Koch Foods 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 North Dakota, Montana, Oregon; facility-reported names can vary across subsidiaries.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files
What to do with Mdu Resources Group Inc's TRI parent record
From Mdu Resources Group Inc, open Rm Heskett Station or compare against Basin Electric rather than reading rank alone.
- Open the largest Form R site for Mdu Resources Group Inc (Rm Heskett Station in ND). Largest facility
- Compare against Minnkota Power Cooperative Inc, the next-higher disclosed-volume parent. Higher-volume parent
- Browse the full parent release ranking to see where Mdu Resources Group 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
Mdu Resources Group 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.