News & Resources
TECHNICAL ARTICLES
EPA-extends-deadlines-emission-rules
EPA Extends Deadlines for Emissions Reduction Rules
The EPA issued an interim final action extending compliance deadlines under NSPS OOOOb, NSPS OOOOc, and the Super Emitter Program. In our latest Delve, we review the impacted rules, their new deadlines, and what it means for the oil and gas industry.
Dan Wood
John Pfeffer
Nationwide Permit Changes 2026
USACE Proposes Changes to Nationwide Permits
USACE is proposing a new Nationwide Permit (NWP) and updates to a handful of existing NWPs. We explain USACE’s proposals and how they could impact certain projects.
Travis Rounsaville, P.E., CFM
Jameson Honeycutt
WEBINARS & TRAININGS
COMPANY NEWS
Joliet, Illinois
Trihydro Opens Office in Joliet, Illinois
Trihydro opens a new Joliet, Illinois office, expanding our Midwest presence to better serve clients with engineering and environmental consulting services.
ENR 2024 Top Environmental Firms
ENR Names Trihydro a Top 200 Environmental Firm for the 19th Year in a Row
Engineering News-Record (ENR) ranks Trihydro #128 on its Top 200 Environmental Firms list for 2024.

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