Company Information

Jacob & Hefner Associates, Inc. (JHA) is a civil engineering, land surveying, and environmental services firm with offices in Illinois, California, Georgia, Texas, and Washington.

JHA’s civil engineering and land surveying divisions were established in 1996 by Jeff Jacob and John Hefner. JHA expanded to California in 2006 with the opening of JHA Environmental, Inc. Expansion has continued with the addition of Environmental Services in Illinois in 2013, the opening of JHA Remediation, LLC in California in 2014, the opening of the Atlanta, Georgia and Seattle, Washington offices in 2018, and opening the Dallas Texas office in 2019.

Our firm provides civil engineering, transportation and municipal engineering, water resources engineering, land surveying, mapping, and environmental remediation implementation, operation, maintenance, monitoring, construction and Phase I and II due diligence services.
We work for a wide range of dedicated clients that include real estate developers, architects, facility managers, consultants, aerospace and industrial manufacturers, major airline companies, local municipalities, and state and federal government agencies.

JHA has successfully completed a wide range of engineering and survey projects from simple parking lot expansions to master-planning and designing critical infrastructure for 1,000 acre business parks.

Our environmental projects have ranged from simple Phase 1 environmental assessments of small commercial properties to performing large scale environmental assessment and remediation projects at aerospace facilities, major airports, and major redevelopment projects.

Codes / Numbers


541330 – Engineering Services
541370 – Surveying and Mapping Services
562910 – Remediation Services (Small Business)

DUNS Number


Cage Code



We have had a positive experience working with JHA. The JHA staff have demonstrated themselves to be hard-working, detailed, and committed to safety in the field. They also maintain a very positive attitude and work well with others on the field team. I personally appreciate JHA's ability to be flexible as project needs or site conditions change.

Consultant Project Manager

I wanted to take a moment and drop you a note to let you know that your O&M Technicians have done an excellent job on our project in North Hollywood, CA. They are knowledgeable, responsive, resourceful and professional. They have been very flexible to our changing needs.

Consultant Group Manager

Thank you for consistently providing quality services to our company for our many in-site injection programs. These field programs were successfully planned and implemented. JHA's experience and expertise allowed us to seamlessly operate these programs on private property and within critical schedules and budgets. The communication, pre-planning, attention to H&S, ability to work with multiple teams and application of previous lessons learned was excellent. Please keep up the good work!

Aerospace Remediation Manager

Our focus has been, and will always be, providing exceptional quality, value, and client service.