Alysen Weiland PE, ENV SP, DBIA™, Principal/Vice President
555 South Flower St.
Suite 4300
Los Angeles, CA 90071

(213) 223-1400 office
(213) 223-1444 fax


Karen B. Carr, CPSM, LEED AP, Assoc. DBIA, Regional Marketing Manager
1075 Creekside Ridge Drive
Suite 200Los Angeles, CA 90071

(916) 788-4985 office
(916) 788-0600 fax


Dedicated to balancing the natural and built environment, Psomas provides sustainably engineered solutions to public and private sector clients. As a full-service consulting firm, we help our clients create value and deliver complex projects. Markets served include transportation, water, site development, and energy with the following services offered:

  • Civil engineering
  • Land surveying including use of 3D laser scanning and drones
  • Site development engineering
  • Transportation and traffic engineering
  • Structural engineering
  • Water and wastewater engineering
  • Environmental planning and resource management
  • Land planning and urban design
  • Land use entitlements
  • Construction management
  • GIS consulting

Sustainable practices are incorporated into all of our services. From designing Institute for Sustainable Infrastructure (ISI) certified projects such as removing pollutants from urban stormwater runoff to site design for LEEDTM-certified projects, Psomas is in the forefront of the sustainable design movement. We currently have over 125 staff who are ENV SPs (Envision Sustainability Professionals through ISI) and/or LEED APs.

The cornerstone of our business approach is to focus on our clients’ long-term needs and then guide our strategic growth to meet those needs. Our core strength is our multi-disciplined teams of experts--- -top-notch staff who produce award-winning projects for our clients through innovation, creativity, and cutting-edge technical expertise.

Founded in 1946, Psomas provides services from offices throughout California, Arizona, and Utah.

  • CA Air Resources Board, Southern California Consolidation, Design-Build Programming and Criteria (civil engineering services)
  • CalSTRS Headquarters Phase I, 409,000 SF, 13-story, LEED Gold
  • Natomas Gateway Corporate Center, 345,000 SF, 12-Story, LEED Gold (civil engineering)
  • I-405 Sepulveda Pass Widening (land surveying and mapping services)
  • Solano County Government Center, six-story, 300,000 GSF, (civil engineering/survey services)
  • U.S. Federal Courthouse, Los Angeles, 633,000 SF, 10-story, 24- courtrooms, LEED Platinum (civil engineering services)
  • DGS, Capitol East End Office Complex, 1.1M SF, LEED Gold (civil engineering/surveying services)
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