Day & Zimmermann is a family-owned company that has been in operation for over a century, providing a wide range of services including construction, engineering, staffing, and defense solutions. The company is headquartered in Philadelphia, Pennsylvania, and has a significant presence across the United States and internationally.

Day & Zimmermann is committed to sustainability and has implemented various initiatives to reduce its environmental impact. The company focuses on energy efficiency, waste reduction, and sustainable sourcing in its operations. They have also been involved in projects that promote renewable energy and environmental conservation.

While specific details on their sustainability certifications or ESG reports are not extensively available, Day & Zimmermann has shown a commitment to integrating sustainable practices into their business model. They continue to explore innovative solutions to enhance their sustainability efforts and contribute positively to the environment.