National Environmental Consulting firm building lifetime relationships with our clients and employees

Using many of our core services, including air quality, biogas and recycling and processing facility engineering, we serve multiple markets from alternative energy to solid waste

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National environmental consulting firm Cornerstone banner

BioCNG Vehicle Fuel Project – Organic Waste Recycling Facility at the Sacramento South Area Transfer Station

Our patent-pending BioCNG system will use about 100 scfm of gas from a food waste digester, which will yield 450 gallons of gasoline equivalent each day. The fuel will be used in waste hauling trucks. Learn More


Our extensive solid waste experience helps clients transition to alternative organics management methods

Incorporating aerated static piles or anaerobic digesters, we can help you through the feasibility, permitting and design process to get the most out of these resources.

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Our Services

From concept to completion, Cornerstone provides a range of specialized services to meet the needs of our clients.
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Air Quality

Achieving compliance cost-effectively, while supporting business operations

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Biogas & Landfill Gas

Experts in collection, control, and beneficial re-use

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Environmental Planning & Compliance

Skilled planning and compliance services over a wide range of industrial and commercial sectors

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Setting the stage for effective site investigation, remediation, expansion, or reuse

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Landfill Engineering & Design

Time tested solutions and innovative techniques to enhance environmental performance while improving the bottom line

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Operations & Maintenance

Focusing on efficient, safe, and compliant operations

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Practical experience helps clients define exit strategies

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Site and Civil Design

Solutions that are integrated with overall facility design and maximize our clients’ assets

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Transactional Services

Understanding and quantifying project value, risks, and upside potential

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Transfer, Recycling, & Processing Facilities

Maximizing operational and asset efficiency, profitability, safety, and durability

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National Presence

Serving large and small clients across the U.S. from a network of regional offices, we offer perspective and knowledge of local business and regulatory issues, and incorporate successful regional, national, and international solutions.

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Cornerstone Environmental has joined the engineering-consulting firm Tetra Tech

Find out how the acquisition will allow Cornerstone to provide even broader technical capabilities.

View Press Release