Investor Presentation November 2023

What Does Montrose Environmental Group Do? We Provide Integrated Environmental • Solutions Focusing on: • • Water treatment, access and quality Energy transition (e.g., waste to renewable biogas) ⚫ Greenhouse gas measurement and mitigation/removal • Response and risk management related to environmental risks and emergencies (e.g. floods or forest fires) • Compliance with environmental regulations (e.g. air quality) We Believe Our Solutions are Differentiated Because: • We integrate disparate and fragmented services into a targeted, cohesive solution We provide unique, patent-protected technology and custom- developed software solutions MONTROSE © 2023 Montrose Environmental Group, Inc. Proprietary. | 6

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