555 South Flower Street

Suite 4300
Los Angeles, CA 90071

Who We Are

Psomas is an engineering, surveying, environmental, and construction management firm that provides consulting services to public and private sector clients in California, Arizona and Utah. We provide services in the transportation, site development, water, and energy markets.

A recognized leader and longtime proponent of environmental, social, and economic sustainability, Psomas brings a holistic approach to our practice and our clients’ projects. In fact, our motto is “Balancing the Natural and Built Environment.” 

Our former President and Chairman of the Board Tim Psomas was the first Chairman of the Institute for Sustainable Infrastructure (ISI) and helped pioneer the Envision rating system. Envision is a state-of-the art resource that helps professionals plan and execute more sustainable civil infrastructure projects.


How We Are Green

Psomas is active in the sustainable design movement by presenting at conferences, writing articles, participating in organizations such as the USGBC and ISI, designing projects that follow sustainable guidelines, and following “green” practices in our everyday running of the business.

Psomas has more than 20 LEED Accredited Professionals and 100 EnvisionTM Sustainability Professionals. Our design teams have experience working on over 40 LEED projects for public and private entities, including 4 LEED Platinum and 25 LEED Gold-level projects. Furthermore, Psomas has worked on 2 of the 10 EnvisionTM Platinum-level projects.



"Tim Psomas has led the fledgling Institute for Sustainable Infrastructure from a start-up organization to a mature and growing presence in municipal, county, state, and federal infrastructure circles, both in North America and internationally," says William Bertera, President and CEO of the Institute for Sustainable Infrastructure.

© Copyright 2019 City of Los Angeles. All rights reserved.