CARTER CREEK GAS PLANT — Emissions Trend

Evanston, WY · 2022–2023 · Parent: HILCORP ENERGY CO

This page assembles 2 consecutive years of EPA Toxics Release Inventory Form R filings for CARTER CREEK GAS PLANT, spanning 2022–2023. Each annual total aggregates on-site air emissions, surface-water discharges, land disposal, and off-site transfers reported by the facility under EPCRA Section 313, which requires disclosure whenever a listed chemical is manufactured, processed, or otherwise used above threshold quantities.

Reported releases opened at 95.0K in 2022 and closed at 83.9K in 2023 — a decreasing of -11.7% over the window. The chart below stacks the four TRI release media (air, water, land, off-site) and overlays the yearly total. The top contributor by cumulative mass is Hydrogen sulfide at 178.7K, followed by Benzene at 180.

Because TRI figures are estimated, not metered, year-over-year deltas can reflect methodology revisions, ownership changes, or shifts in what a facility classifies as reportable — not only physical emission changes. Treat the trajectory as a disclosure record, and cross-reference with the EPA Enforcement and Compliance History Online (ECHO) system for the fuller regulatory picture on this natural gas processing facility.

Overall Trend
↓ Decreasing (-11.7%)
2022 Total
95.0K lbs
2023 Total
83.9K lbs

Total Releases by Category

Air
Water
Land
Offsite Transfer
019.0K38.0K57.0K76.0K95.0K 20222023 Pounds Released

Year-over-Year Comparison

Year Total Chemicals YoY Change
2022 95.0K lbs 4
2023 83.9K lbs 4 -11.7%

Top Chemicals by Year

Chemical 20222023 Total
Hydrogen sulfide 94.9K 83.8K 178.7K
Benzene 79 101 180
Diethanolamine 0
Ethylene glycol 0

About This Data

Trend data is sourced from the EPA Toxic Release Inventory (TRI). Facilities report annually. Release quantities are self-reported estimates. Year-over-year changes may reflect changes in production, pollution control measures, reporting methodology, or chemical thresholds.

A decrease in reported releases does not necessarily indicate improved environmental performance, as it may reflect production cutbacks, facility closures, or changes in reporting requirements. Similarly, increases may reflect expanded production rather than degraded environmental practices.

Frequently Asked Questions

Is CARTER CREEK GAS PLANT getting cleaner or dirtier?
Based on EPA TRI data from 2022–2023, CARTER CREEK GAS PLANT's total toxic releases have decreased by approximately 12%.
What time period does this trend data cover?
This page shows 2 years of EPA Toxic Release Inventory data from 2022–2023. Release quantities are self-reported estimates filed annually by the facility.