Our background

is rooted in agriculture.

Stemming from the Central Valley of California, we understand the need for renewable and sustainable agriculture from a farmer-focused perspective. This understanding has influenced our company culture and everyday lives – it’s at the heart of what we do.

Our Mission:

To provide clients leadership, innovation, and technology in order to achieve environmental and business goals.

Our Expertise

Feedstock Testing

We have tested feedstock manure at more dairies than any other EPC team in the country.

In-House Engineering

All engineering is done in-house – we don’t rely on 3rd parties.

Trusted Contracting

Our network of trusted contractors emphasize safety, quality and timeliness on every project.

  • Dairy anaerobic digesters and bio-energy systems
  • Accurate LCFS and eLCFS biogas predictions
  • Company owned wastewater testing laboratory
  • Anaerobic dairy digestion research and development
  • Water board permitting and regulatory assistance
  • Photo-voltaic systems permitting and civil design
  • Hydraulic and hydrology analysis & design
  • Wastewater system design
  • Irrigation & ditch design
  • Geo-synthetic design
  • Agricultural permitting and design
  • Pistachio huller and processing design, permitting and regulatory assistance
  • Storm water pollution & prevention planning
  • SPCC
  • Report of waste discharge permitting
  • Civil site design for residential, commercial, and industrial
  • Industrial facility site design
  • Construction management
  • Procurement
  • Geo-synthetic design, CQA

Looking for EPC services?

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  • "Calgren has had the pleasure of working with Craig Hartman on numerous engineering issues. He's been prompt, knowledgeable and responsive. In areas such as anaerobic digestion of dairy manure there is no one better."

    Lyle Schlyer Calgren Renewable Fuels | CEO
  • “Craig Hartman has designed and built more successful dairy digesters than any engineer in the state. He was the first P. E. our company hired back in 2010 and we’ve never looked back. Craig’s vision, diligence, and commitment to excellence for California dairies have driven Maas Energy Works forward to build over 65% of the state’s current digester install base.”

    Daryl Maas Maas Energy Works Inc. | CEO

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