First time the Society has provided consensus-based standard on sustainable solutions to infrastructure projects

RESTON, VA — The American Society of Civil Engineers (ASCE) today released a first-of-its-kind standard, ASCE/COS 73-23: Standard Practice for Sustainable Infrastructure, which provides guidance for infrastructure owners to develop and implement sustainable solutions through a project’s entire life cycle. It is a non-mandatory, performance-based standard designed for civil infrastructure ranging from transportation projects to water systems to the energy grid, developed over a period of five years involving a multitude of diverse stakeholders.

ASCE President Maria Lehman noted, “This is a transformational standard that for the first time will establish consensus guidance on how infrastructure owners should address sustainability in their projects. As of early September, there have been 23 confirmed weather/climate disaster events in the U.S. with losses exceeding $1 billion. That’s almost one every week and a half. Sustainability and resilience are more important than ever. Infrastructure owners and designers have a responsibility to develop and implement practices that promote sustainability and long-term reliability of infrastructure projects, while also being cost-effective and collaborative with community stakeholders.”

The standard complements existing ASCE standards and tools like the Envision rating system.

“As a leading source for minimum design loads through our most widely-adopted standard ASCE 7-22, ASCE is in an optimal position to drive the future of sustainable infrastructure through the new ASCE/COS 73-23 standard,” said Cris Liban, D.Env., P.E., Dist.M.ASCE, chief sustainability officer for the Los Angeles County Metropolitan Transportation Authority. Implementation of this framework by policymakers, infrastructure owners and practitioners will promote mitigation and adaptation towards environmental threats, provide innovative alternatives to current construction practices, and minimize long-term costs over a project’s entire life cycle.”

Sustainability as it pertains to infrastructure includes projects that are planned, designed, constructed, and maintained in a way that balances the economic, environmental, and social benefits over the entire life cycle of the project. To achieve this, ASCE/COS 73-23 calls for infrastructure owners to develop infrastructure that achieves environmental benefits and resilience measures while ensuring equity, mobility, inclusion and the preservation of cultural heritages and resources. Reuse of existing infrastructure to the extent that it is possible, reducing energy demand for a project and using renewable energy sources, and reducing waste and hazardous materials in the construction process and life cycle of the project are critical components of infrastructure sustainability.

The standard also calls for infrastructure owners to engage community involvement to ensure the community’s needs will be met, while also creating jobs and providing skills development to those in the community who wish to participate in construction of the project.

Reduction of embodied carbon — which refers to the greenhouse gas emissions stemming from the entire process of transporting materials, constructing, operating and maintaining an infrastructure project — is also a focus of the ASCE/COS 73-23 standard. There are a variety of methods for reducing embodied carbon and many trade-offs to consider when addressing these reductions, but the standard encourages infrastructure owners to contemplate all of these factors in the planning of current and future assets.

A discussion and examination of the ASCE/COS 73-23 standard will be held at the ASCE INSPIRE 2023 Conference in Arlington, Virginia from November 16–18. Print copies of the standard will also be available for purchase at the conference. Register today for the event and learn more about sustainable and resilient innovations in the civil engineering space.

Purchase ASCE/COS 73-23: Standard Practice for Sustainable Infrastructure from the ASCE bookstore.

About the American Society of Civil Engineers

Founded in 1852, the American Society of Civil Engineers represents more than 150,000 civil engineers worldwide and is America's oldest national engineering society. ASCE works to raise awareness of the need to maintain and modernize the nation's infrastructure using sustainable and resilient practices, advocates for increasing and optimizing investment in infrastructure, and improve engineering knowledge and competency. For more information, visit or and follow us on Twitter, @ASCETweets and @ASCEGovRel.