Natural Resources | Permitting and Compliance
California Conditional Letter of Map Revision
Trihydro provided hydraulic modeling and floodplain permitting services for a remediation project to increase wetland area…
Permitting and Compliance
Supporting environmental permitting and compliance across federal, state, and local regulations through coordinated strategy, agency engagement, and ongoing compliance management.
Projects
Industrial and Chemical | Permitting and Compliance
Class VI Permitting, CARB Certification, and Monitoring Program
As part of a multi-organization team, Trihydro supported permitting efforts and led baseline environmental monitoring for a…
Natural Resources | Permitting and Compliance
Cal-Wood Wildfire Rehabilitation
When the Cal-Wood Fire left more than 10,000 acres of burned land in its wake, Trihydro supported Boulder County Parks and…
Industrial and Chemical | Assessment and Remediation
Remedy Evaluation and Implementation for Brownfield Funding
The Town of Dubois contracted Trihydro to provide technical assistance for remedy evaluation and implementation for…
Oil and Gas | Permitting and Compliance
Environmental Due Diligence
Trihydro partnered with a Fortune 500 waste management firm and local environmental health & safety managers to rapidly…
Delve Articles
Oil and Gas | Air Quality Compliance
EPA Proposed Changes to NESHAP Subparts HH & HHH Part 3: LDAR Technologies, MACT Updates, and Compliance Timelines
On April 22, 2026, the U.S. Environmental Protection Agency (EPA) proposed updates to the National Emission Standards for…
Oil and Gas | Air Quality Compliance
EPA Proposed Changes to NESHAP Subparts HH & HHH Part 2: Source Classification, Permitting, and Compliance
On April 22, 2026, the U.S. Environmental Protection Agency (EPA) proposed updates to the National Emission Standards for…
Industrial and Chemical | Permitting and Compliance
EPA Releases List of Expiring TSCA Confidential Business Information Claims
Companies with Toxic Substances Control Act (TSCA) Confidential Business Information (CBI) claims may soon face approaching…
Oil and Gas | Air Quality Compliance
EPA Proposed Changes to NESHAP Subparts HH & HHH Part 1: Key Changes, Compliance, and Comment Deadlines
On April 22, 2026, the US Environmental Protection Agency (EPA) proposed updates to the National Emission Standards for…
Oil and Gas | Air Quality Compliance
Colorado Regulation 7 Update April 2026: EG OOOOc Alignment and GHG Intensity Timeline Changes
Key Updates Colorado adopted an April 2026 revision to Regulation Number 7, Control of Emissions from Oil and Gas…
Oil and Gas | Air Quality Compliance
EPA Proposal Would Keep Utah’s Uintah Basin Ozone Area in Marginal Nonattainment (2015 Ozone NAAQS)
On April 23rd, 2026, The US Environmental Protection Agency (EPA) proposed to reconsider and repeal its December 2024…
Industrial and Chemical | Permitting and Compliance
New Mexico’s AFFF Rule Extends Beyond Foam Inventory
New Mexico has adopted rules for intentionally added per- and polyfluoroalkyl substances (PFAS) in aqueous film-forming foam…
Industrial and Chemical | Permitting and Compliance
ISO 14001:2026 Environmental Management System (EMS) Update — Revisions from ISO 14001:2015
ISO 14001: 2026 is the upcoming update to the global environmental management system (EMS) standard. This update…
Oil and Gas | Permitting and Compliance
What EPA’s “Compliance First” Approach Means for Regulated Communities
EPA has adopted a new enforcement strategy that directs enforcement staff to take a “compliance first” approach to all…
Industrial and Chemical | Permitting and Compliance
EPA Takes Action to Tighten Perchlorate Regulations for Drinking Water
Following a court order, EPA is taking action to tighten regulations for perchlorate in drinking water. We explain what the…
Industrial and Chemical | Permitting and Compliance
Oklahoma DEQ Proposes Water Rule Updates to Align with New EPA Regulations
The Oklahoma Department of Environmental Quality (DEQ) is revising Title 252 of the Oklahoma Administrative Code (OAC),…
Industrial and Chemical | Permitting and Compliance
Navigating New State and SEC Environmental Disclosure Regulations
Historically, some companies have disclosed their environmental footprint voluntarily, choosing to highlight their…
Trainings
Industrial and Chemical | Assessment and Remediation
Training: Corporate Sustainability Planning and Assessment
Trihydro’s Corporate Sustainability Planning and Assessment training is designed for companies interested in how…