Onterris, formerly known as Montrose Environmental Group

Executive Overview

Onterris, formerly known as Montrose Environmental Group, is a leading provider of environmental solutions, delivering specialized expertise for complex environmental challenges through advanced science, engineering and consulting. The company supports a range of industries, municipalities, and government agencies in addressing issues like contamination, remediation, and environmental testing, while driving climate resilience and environmental equity.

Among its most transformative solutions is SORBIX™ RePURE, the world’s first regenerable ion exchange system designed to remove PFAS from water systems. By combining scientific innovation with scalable infrastructure, Onterris is helping communities and industries meet evolving regulations while safeguarding the air, water and soil that sustain life.

Awards Insider Feature

Challenge

Often called “forever chemicals,” PFAS – found in drinking water, wastewater, industrial systems, and contaminated sites – represent one of the world’s most complex environmental and public health challenges worldwide. Traditional PFAS treatment relies on single-use media, such as carbon or ion exchange resins, and requires ongoing replacement every 9-12 months. It also generates tons of hazardous PFAS waste that must be landfilled or incinerated. This outdated model creates long-term liability, high operational costs, and significant environmental burden. Impacted communities and industries need solutions that can remove PFAS effectively while reducing waste, operational complexity and lifecycle costs.

Innovation

Onterris's flagship SORBIX™ RePURE technology solves this problem by enabling closed-loop, reusable PFAS treatment with >99% waste reduction. Deployed rapidly for municipalities, utilities, industry, and remediation projects, RePURE is now operating at some of the largest PFAS treatment installations worldwide – exceeding 30,000 gallons per minute across Onterris’s three largest systems.

The technology is supported by a patented hub-and-spoke model that centralizes resin regeneration. This allows multiple municipalities and industrial users to share infrastructure – a breakthrough in environmental engineering that dramatically reduces cost, waste and complexity.

RePURE technology can also be deployed through full-scale fixed installations or mobile systems for urgent contamination events, enabling clients to deploy rapid-response mobile systems for immediate needs, with a seamless path to transition into permanent, full-scale installations for long-term protection.

Impact

Onterris’s technology delivers quantifiable environmental benefits by dramatically reducing waste, emissions and lifecycle impacts associated with PFAS remediation. The SORBIX™ RePURE system reduces PFAS-laden waste by more than 99% compared with single-use carbon and resin systems, eliminating the need for recurring disposal through landfilling or high-temperature incineration, both of which produce harmful byproducts. The closed-loop regeneration cycle cuts operational waste while lowering the carbon footprint tied to material replacement, waste transport and facility downtime.

Onterris’s hub-and-spoke regeneration model further enables shared regional infrastructure, reducing customers’ environmental footprint and operational costs by more than 50%. Today, Onterris systems treat billions of gallons of water annually across municipal, industrial and remediation applications.