Yesterday, we were Montrose Environmental Group. Now, we're Onterris. We're an environmental solutions company working with clients to solve challenges where environmental pressures, regulations and operational risks intersect: bit.ly/4sLzFWU #ForPlanetAndProgress

PFAS contamination requires scalable, proven solutions. The Defense Innovation Unit has issued Onterris a Success Memo, validating our PFAS treatment technology and creating a streamlined pathway for eligible federal agencies to deploy it in future remediation projects. Learn more: bit.ly/3W03uIz

Onterris is now ranked No. 5 among the world’s leading pure-play environmental firms in the latest @ENRnews Top 200, climbing from No. 7 in 2025. We’re proud of how far we’ve come, and we're focused on what’s next. Learn more: bit.ly/4B1aAfL #ForPlanetAndProgress

News: #EPA Administrator Lee Zeldin visited Onterris to see how our proven #PFAS technology can make effective treatment available for communities across the country. With more than 350 treatment systems deployed, we’re working to solve this drinking water challenge. Learn more: bit.ly/4zDgrqr #ForPlanetAndProgress

Today, we launch our 2025 Sustainability Report, reflecting the progress we’ve made over the past year and the foundation we continue to build as Onterris. Read the full report: bit.ly/3TXf3zu #ForPlanetAndProgress #Sustainability

We're proud of the momentum the Onterris Brownfields & Community Revitalization team is building nationwide. Thus far in 2026, the team has secured more than $14 million in new work across 86 client engagements, while helping clients secure more than $20 million in EPA #Brownfields Grant funding. Learn more: bit.ly/4ruW4IP

Onterris has been awarded a C$9 million environmental services contract in support of a major C$3 billion natural gas infrastructure project in Canada. With integrated environmental expertise spanning planning and permitting through construction-phase reclamation, this project will help enable critical infrastructure, protect natural resources and create lasting value for planet and progress. Read the full release: bit.ly/46VtIxX #ForPlanetAndProgress

We're excited to welcome Kurt Beil as the new Executive Vice President for our global Consulting business. He brings 30 years of leadership excellence, guiding organizations to profitable growth while developing strategies that strengthen client relationships. Learn more: bit.ly/4c0vAIJ

We're proud to celebrate a new A$6 million multi-year contract supporting a major mining operation in Queensland, Australia. This project highlights the important role responsible mining and rigorous environmental assessment play in supporting energy security while advancing sustainable development. Find out more: bit.ly/4uXWPu9 #ForPlanetAndProgress

Announcement: we've joined @GreentownLabs as a Terawatt Partner, connecting our teams with a community of startups working in energy, agriculture, manufacturing, transportation and climate resilience. Learn how this partnership expands our innovation ecosystem: bit.ly/43m9snC #ForPlanetAndProgress

To celebrate Earth Day this year, we partnered with @Evertreen to gift each one of our team members a tree, supporting certified, satellite-monitored planting programs in the U.S., Canada and Australia. The result: 3,400+ trees planted as a symbol of our commitment to the environment. Learn more about this partnership on our Evertreen Onterris Forest dashboard: bit.ly/4wq6I5R #ForPlanetAndProgress

Team Onterris delivered first quarter adjusted EBITDA and margin consistent with our expectations, despite lower revenue. Our full year outlook is unchanged, with performance expected to build through the year. We also expect the recent launch of our Onterris brand to accelerate long-term growth. Full Q1 financial results: bit.ly/4tqeRVl #TeamOnterris #ForPlanetAndProgress

Environmental performance is no longer peripheral. It is shaping growth, capital access and operational performance. 𝐓𝐡𝐞 𝐎𝐧𝐭𝐞𝐫𝐫𝐢𝐬 𝐎𝐮𝐭𝐥𝐨𝐨𝐤: 𝐖𝐡𝐲 𝐞𝐧𝐯𝐢𝐫𝐨𝐧𝐦𝐞𝐧𝐭𝐚𝐥 𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐢𝐬 𝐛𝐮𝐬𝐢𝐧𝐞𝐬𝐬-𝐜𝐫𝐢𝐭𝐢𝐜𝐚𝐥, explores insights from 500 senior decision-makers across North America, Europe and Oceania: bit.ly/3R57p4h What is environmental performance doing for your business? Read the full report. #ForPlanetAndProgress

Onterris has been named a Judges’ Choice winner in the 2026 @E_E_Leader Awards: bit.ly/4ujh05W This award recognizes SORBIX™ RePURE, the first regenerable ion exchange system purpose-built to remove PFAS from water. Cutting PFAS waste by over 99%, reducing costs and environmental impact by more than 50%, this system treats billions of gallons of water annually. #ForPlanetAndProgress #SORBIX

When we started Montrose Environmental Group, our goal was to become the brand people turn to first when tackling environmental challenges and opportunities. Our CEO Vijay Manthripragada and SVP of Marketing & Communications Lauren Dowling came together to define what this rebrand truly represents: bit.ly/4czOzuF #ForPlanetAndProgress

The next era of true progress is inseparable from environmental stewardship. This is where we create value: by combining science, data and expertise to protect the air, water and soil that sustain our communities. Introducing, Onterris. Discover more: bit.ly/48aXCj4 #ForPlanetAndProgress