EPA TRI Facility · Natural Gas Processing
Markwest Hidalgo Plant
Orla, TX · Parent: Marathon Petroleum Corp
- Total releases
- 219.7K lbs
- Chemicals reported
- 11
- Carcinogens
- 4
- Primary pathway
- Off-site Transfers
OFFSITE Form-R mix
Markwest Hidalgo Plant: how the 219.7K lbs splits
219.7K lbs across all reported pathways
- Off-site Transfers 219.7K lbs 100.0%
Markwest Hidalgo Plant's 219.7K lbs Form-R total is OFFSITE - off-site transfers is 100.0% of the bar. Off-site transfers stay separate from air, water, and land releases. Leading chemical by pounds: Ethylene glycol.
Carcinogen-classified pounds vs other reported pounds
Same cumulative TRI total as above, split by EPA/IARC carcinogen classification on each chemical: pounds share, not chemical count. Classification is not a site health-risk score.
MID volume OFFSITE pathway CARC-MID
Markwest Hidalgo Plant is an EPA Toxics Release Inventory reporter in Orla, TX, in the natural gas processing sector. It reported 72.6K lbs of releases across 4 chemicals in 2023, and 219.7K lbs in total across its 2022-2023 reporting years. That ranks 3,084 of 25,986 TRI facilities nationwide by cumulative reported pounds, counting each facility over however many years it has filed. In Texas's 2,016 reporting TRI sites, pounds #1 is not chemical-count #1. Markwest Hidalgo Plant is pounds #325 and chemical-count #223 at 219.7K lbs. Ascend Performance Materials-Chocolate Bayou Plant leads reported pounds (94.0M lbs) at 36 chemicals (chemical-count #35). Veolia Es Technical Solutions LLC Port Arthur Facility leads chemical count at 246 chemicals (1.5M lbs, pounds #112). Reported volume fell against 2022. Pounds reported are not a measure of toxicity or health risk. Nearest other TRI reporters: Ramsey Gas Plant; Delaware Basin Gas Plant; Orla Gas Plant; Stateline Processing Plant. Similar-scale Natural Gas Processing peers outside Texas: Opal Gas Plant; Echo Springs Gas Plant; Big Escambia Creek Gas Plant; Carter Creek Gas Plant. Other Marathon Petroleum Corp sites in this extract: Blanchard Refining Co LLC; Marathon Petroleum Co LP; Marathon Mandan Refinery; Catlettsburg Refining LLC. Largest disclosed chemicals by pounds: Ethylene glycol; Naphthalene; Xylene (mixed isomers); Toluene.
Markwest Hidalgo Plant stamps MID volume with a dominant OFFSITE pathway (100.0% off-site transfers) across 11 chemicals · 4 carcinogen-classified. Cumulative Form-R extract: 219.7K lbs (2022–2023). All figures are self-reported EPCRA §313 estimates, not measured stack emissions or a health-risk score. Scale peers include Opal Gas Plant and Echo Springs Gas Plant.
Markwest Hidalgo Plant vs. every reporting TRI facility
Cumulative reported release pounds, with this facility marked in the national distribution
220K lbs Top 12% higher than 88% of 25,986 reporting TRI facilities
Each bar is a $1M-wide band; taller bars hold more reporting TRI facilities. The dashed line and filled bar mark this facility. Hover, focus, or tap a bar for its full count, share, and position.
Source U.S. Environmental Protection Agency, Toxics Release Inventory · 2023 reporting year
Markwest Hidalgo Plant inside Culberson's TRI pounds
Among the 339 Natural Gas Processing facilities in this database, Markwest Hidalgo Plant reports the 30th-largest volume, placing it in the top 8.8% of its sector. This one site accounts for 57.5% of every pound reported in Culberson. Scale peers outside Texas include Opal Gas Plant and Echo Springs Gas Plant.
County-dominant here means ≥25% of Culberson's reported pounds (382.4K lbs county total). Shares only print when the site reports ≥1,000 lbs.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- Markwest Hidalgo Plant's total reported releases fell from 147.1 thousand lb in 2022 to 72.6 thousand lb in 2023, based on EPA TRI filings.
- Markwest Hidalgo Plant's chemicals reported fell from 10 in 2022 to 4 in 2023, based on EPA TRI filings.
- Markwest Hidalgo Plant's off-site transfers fell from 147.1 thousand lb in 2022 to 72.6 thousand lb in 2023, based on EPA TRI filings.
Markwest Hidalgo Plant Form-R facts
Compare this facility
See how Markwest Hidalgo Plant stacks up against nearby facilities and the typical reporter.
2.3× more than the comparison
22% more than the comparison
Comparison reflects reported pounds and chemical counts, not toxicity or health risk. Averages cover facilities reporting any release.
How does this facility release toxic chemicals?
How Markwest Hidalgo Plant releases toxic chemicals into the environment. Total: 219.7K lbs.
Emissions Trend Summary
From 2022 to 2023, total releases decreased by 51% (147.1K lbs to 72.6K lbs).
Markwest Hidalgo Plant: annual Form-R pounds
MID site · OFFSITE pathway · TRI years 2022–2023
- 2022 0
- 2023 0
What this shows Markwest Hidalgo Plant year-over-year reported totals (decreased by 51% from 2022 to 2023). TRI figures are self-reported estimates and can swing with production, waste handling, and reporting changes, not only with controls. Lead chemical in the extract: Ethylene glycol.
| Year | Total | Chemicals |
|---|---|---|
| 2022 | 147.1K lbs | 10 |
| 2023 | 72.6K lbs | 4 |
Chemical Releases
Aggregated across all reporting years (2022–2023). 4 of 11 chemicals are carcinogens. Sorted by total release volume.
| Chemical | Total | Flags |
|---|---|---|
| Ethylene glycol | 67.1K lbs | - |
| Naphthalene | 63.9K lbs | Carcinogen |
| Xylene (mixed isomers) | 32.0K lbs | - |
| Toluene | 16.0K lbs | - |
| 1,2,4-Trimethylbenzene | 16.0K lbs | - |
| n-Hexane | 13.6K lbs | - |
| Benzene | 8.0K lbs | Carcinogen |
| Ethylbenzene | 1.6K lbs | Carcinogen |
| Cumene | 1.6K lbs | Carcinogen |
| Cyclohexane | 0 lbs | - |
| Methanol | 0 lbs | - |
Markwest Hidalgo Plant · OFFSITE-pathway site
Nearest TRI Facilities to Markwest Hidalgo Plant
Closest other reporters in Texas - including Ramsey Gas Plant, Delaware Basin Gas Plant, Orla Gas Plant, ordered by distance.
Showing 8 of 2,015 other reporting facilities in Texas.
Similar Natural Gas Processing Facilities
Other Natural Gas Processing facilities with similar total release volumes (±80%), outside Texas - e.g. Opal Gas Plant, Echo Springs Gas Plant, Big Escambia Creek Gas Plant.
Compare beyond Texas
Nationwide peers by reported pounds & chemical count
Cross-state TRI reporters nearest Markwest Hidalgo Plant on cumulative reported pounds (219.7K lbs) and distinct chemical count (11). Release-pound peers include Plastics Engineering Co, Hon Co, Weyerhaeuser Nr Co-Philadelphia Lumber. Chemical-count peers include Puerto Rico Energy LLC - Bayamon Terminal, Lanco Manufacturing Corp, Buckeye Caribbean Terminals LLC (former Scyi). Neighborhoods are forced disjoint so each axis surfaces a different set of sites.
Similar reported release pounds
Nearest out-of-state reporters (≥1,000 lbs) by absolute TRI pounds, not same-industry or same-county neighbors.
Similar chemical count
Nearest out-of-state reporters by distinct Form-R chemicals (deduped against the release-pound neighborhood).
- Puerto Rico Energy LLC - Bayamon Terminal Bayamon, PR · Petroleum Bulk Terminals 11 chemicals
- Lanco Manufacturing Corp San Lorenzo, PR · Chemicals 11 chemicals
- Buckeye Caribbean Terminals LLC (former Scyi) Yabucoa, PR · Petroleum Bulk Terminals 11 chemicals
- Limetree Bay Terminals LLC DBA Ocean Point Terminals Christiansted, VI · Petroleum Bulk Terminals 11 chemicals
Other Marathon Petroleum Corp Facilities
Same-parent TRI sites ranked by reported releases - including Blanchard Refining Co LLC, Marathon Petroleum Co LP, Marathon Mandan Refinery.
About TRI Data
Data as of 2023 reporting year. Source: U.S. Environmental Protection Agency (EPA) Toxic Release Inventory.
On this page the largest disclosed chemicals include Ethylene glycol, Naphthalene, Xylene (mixed isomers), Toluene; nearby reporters include Ramsey Gas Plant. Markwest Hidalgo Plant stamps MID volume · OFFSITE pathway · CARC-MID carcinogen-lbs on this Form-R extract. Totals are self-reported estimates under EPCRA §313, not measured stack emissions or a health-risk score.
Use and verify this record
This Markwest Hidalgo Plant TRI extract (MID · OFFSITE · CARC-MID · lead Ethylene glycol) joins EPA Form-R filings with facility identity - reported pounds, not a health-risk rating.
Markwest Hidalgo Plant totals are self-reported EPCRA §313 estimates for Orla, TX, latest year 2023. Form-R rows span 2022–2023 (2 years). NAICS 211130 · Natural Gas Processing. 57.5% of Culberson TRI pounds in this extract. Nearest ABS peer: Plastics Engineering Co (Δ 23 lbs). Pounds ≠ exposure.
Markwest Hidalgo Plant stamps MID volume · OFFSITE pathway · CARC-MID · lead Ethylene glycol. PlainEnviro renders this EPA Form-R extract from its pipeline; no figure is typed in by an editor. Corrections: editorial policy.
All federal data sources used on this page
- EPA Toxics Release Inventory (TRI) Basic Data Files - annual self-reported chemical-release filings. epa.gov
- EPA TRI Program reference - how chemicals and reported releases are counted. epa.gov
- EPA Facility Registry Service - facility location and identity. epa.gov
- EPA ECHO - regulatory and compliance context. epa.gov
- EPA Envirofacts - the EPA data warehouse exposing these datasets. epa.gov