Ethylene Oxide Update #71: October 2, 2026
Oct 2, 2026
This update includes:
• Quarter 2 stack monitoring and fugitive emissions results received by IEPA
• Vantage within permitted emission cap
The Illinois Environmental Protection Agency (IEPA) has updated its website to include the 2026 Q2 data related to Vantage’s permit. The results indicate Vantage has released 25.70 pounds (23.37% of permitted annual total) of EtO cumulatively year-to-date, of which 21.79 pounds (36.32% of permitted annual total) were emissions from affected components. Public Act 101-0023 and Vantage’s Construction Permit limit the facility to 110 pounds of emissions annually of which no more than 60 pounds can be fugitive emissions. The Q2 submission noted six leaking components, out of 746 total components monitored, during the three-month period. The components were repaired by tightening connections or replacing gaskets.
In addition, effective April 17, 2026, Montrose Environmental Group rebranded its company name to Onterris. This had no impact on the monitoring campaigns at the Vantage Gurnee facility.
The second quarter report is now available on the IEPA website here.
Past reports can be found here: Illinois EPA information on Ethylene Oxide