CAS & Associates, LLC (CAS) is an environmental engineering and consulting firm, based in Boise Idaho specializing in Phase I and II Environmental Site Assessments (ESAs). CAS has been providing professional environmental services to industrial, municipal, construction, and transactional clients for over the past thirty years.

CAS has completed ESAs by experienced staff and all are directed by environmental professionals with over 30 years of experience. Our projects are very cost-effective because we are a small employee-owned company and we do not have the large overhead and expenses of a large company. Our average turnaround on our Phase I ESAs is within 10 Business days.

We have the available staff of Engineers and Geologists and complete multi-site portfolios with very short due dates. We take pride in the fact that we can provide quality Phase I ESA reports for less cost than our competition.

Boise Environmental Engineering Firm

The main objective of CAS is to provide an objective and professional judgment of recognized environmental conditions (RECs) to the extent feasible pursuant & prescribed within ASTM Standards.


CAS not only serves our close neighbor clients in Meridian, Eagle, and Nampa but also in other cities throughout the state of Idaho and adjacent States. CASs experienced team of Engineers and Geologists are the key to our success.  

In general, the scope of services for a Phase I ESA includes an evaluation of the following:


  • Physical characteristics of the Subject Property based on a review of referenced sources such as topographic maps and available geologic, soils and hydrologic reports.


  • Information of properties, with the specified minimum search distances from the Subject Property, available in the agency databases and in local environmental records.


  • Current and past uses of on and off-site conditions and surrounding areas through an evaluation of historical sources such as aerial photographs, fire insurance maps, city directories, interviews, and prior reports.


  • Asbestos and lead-based paint containing materials screening, consisting of a review of available analytical data, the age of the improvements, dates of renovation, and other relevant information.


Marianne Payne


Meridian Holdings

CAS & Associates, LLC is my only choice for  environmental work. They are a pleasure to work with and  make sure to review any questions or issues that arise from their reports. They go "the extra mile" for their clients on every job.

Randy Hopkins


Hopkins Financial Svcs.

As the Founder of Hopkins Financial, I highly recommend them for  anyone needing  professional and timely Phase I & II Environmental Site Assessment reports. They are practical advisors in the complex world of environmental hazords.