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
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…
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…
Remedy Evaluation and Implementation for Brownfield Funding
The Town of Dubois contracted Trihydro to provide technical assistance for remedy evaluation and implementation for…
Environmental Due Diligence
Trihydro partnered with a Fortune 500 waste management firm and local environmental health & safety managers to rapidly…
Delve Articles
EPA’s UCMR 6 Expands Monitoring for 30 Emerging Drinking Water Contaminants
The U.S. Environmental Protection Agency (EPA) has released its proposed Sixth Unregulated Contaminant Monitoring Rule (UCMR…
EPA Acts to Protect Workers from 1,2-Dichloroethane (1,2-DCA)
The U.S. Environmental Protection Agency (EPA) recently announced plans to regulate 15 industrial and commercial uses of…
Colorado Regulation 30 PTAC Formaldehyde Considerations
Colorado Department of Public Health & Environment (CDPHE) Regulation 30 (5 CCR 1001-35) is the Colorado Air Quality…
Colorado General Permit 12 (GP12) for Oil & Gas Permitting Explained
Colorado’s oil and gas general permits for well production facilities have changed significantly with the release of…
The New EPA Alters PFAS Drinking Water Compliance Rules
The U.S. Environmental Protection Agency (EPA) recently announced two proposed rules that would preserve federal drinking…
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…
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…
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…
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…
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…
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…
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…
Trainings
Training: Corporate Sustainability Planning and Assessment
Trihydro’s Corporate Sustainability Planning and Assessment training is designed for companies interested in how…