Contact Us

201 East Street
Woodland, CA 95776

Tel: (530) 662-5442
Fax: (530) 662-1209

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About The Tremont Group, Inc.

We understand our industry and farming, we know our growers, their crops and their needs. Ultimately, our success is measured by how well we help growers succeed and prosper.


Growing safe, productive and profitable crops today requires:

The ability to effectively compete in a global market place.

Compliance with increasingly complex regulatory environmental and food and workers safety issues.

A growing investment in specialized knowledge, products, technology and services.

Continuous innovation and improvement at all levels of operations.

That’s why we invest wisely in the people, production facilities, products, specialized equipment and additional resources that enables our Tremont Group team to deliver the added value for farm success we promise – day after day and year after year.

Tremont Group Divisions

  • AgriformAgriform
  • Agriform PartsAgriform Parts
  • Ag UnlimitedAg Unlimited
  • Growers Ag ServiceGrowers Ag Service
  • TSI FertilizerTSI Fertilizer
  • TSI TruckingTSI Trucking


Our history is a track record of growth, focused on how we can add value to grower and agribusiness success.


Tremont Supply, Inc. was formed as a joint venture with the J.R.Simplot Company in the operation of a fertilizer plant located on Tremont Road in Dixon, CA. The rail siding at the fertilizer plant was called Tremont Station, and the founders wanted to call the company Tremont Station, Inc., but the name was taken.


Tremont Supply, Inc. changed its name to The Tremont Group, Inc.


Tremont Supply, Inc. bought out J.R. Simplot and became the full owner of the plant on Tremont Road.


Tremont Supply, Inc. acquired Agriform Farm Supply with a plant in Woodland, and retail sales offices in Woodland and Pleasant Grove. Agriform also had a sales office in Geyserville which operated under the name Agro-Tech.


The Tremont Group, Inc. acquired Growers Ag Service, Inc with retail sales offices in Dixon, Tudor, and Sonoma, CA The name of the Sonoma office was changed to Agro-Tech, and the remaining offices continue to operate under the Growers Ag name.


The Tremont Group Inc. is recognized as a national agribusiness leader in Homeland Securities Act compliance and sound environmental operations.


Agro-Tech in Geyserville and Sonoma changed to “Ag Unlimited, a division of The Tremont Group, Inc.”


The Tremont Group purchased Walnut Grove Transports, which is now TSI Trucking.


2010 – Environmental Respect State Award – Harvey Lyman Company, Walnut Grove

Harvey Lyman Company of Walnut Grove has been named the Environmental Respect Award state winner for California in 2010. Winners were selected May 6 in Willoughby, Ohio. The Environmental Respect Awards, sponsored by CropLife magazine and DuPont Crop Protection, are the agricultural industry’s highest recognition......

2011 – Ag Retailer of the Year Award – The Lyman/Tremont Groups

The Lyman/Tremont Group is two companies with the same top management team. Entrepreneurial managers are employed for each of the14 separate operations and facilities spread across northern California agricultural regions north, west and south of Sacramento. “We have been on a steady growth curve for......

2014 – Environmental Respect State Award – Growers Ag Service, Yuba City

Twenty one top farm supply retail businesses have been selected as Environmental Respect Award state winners. Willoughby, OH (PRWEB) April 28, 2014 Twenty one top farm supply retail businesses have been selected as Environmental Respect Award state winners in the United States for 2014. The......

Tremont Group Values

Good moral and ethical values are a given for our company and our people. So are common sense and good judgment.


define our way of doing business and who we are as people.


for the land, people and the environment and its habitat is a basic job requirement for any position in our company.

Work Ethic

is the backbone of farm success and our success as well.


is the Tremont way of meeting and exceeding customer expectations and needs.

Service & Stewardship

are the heart and soul of our company.


is doing what it takes to add value for farm success, when needed, as needed, and done right.


We’re all in this together. Environmental responsibility and stewardship are essential for our success as a company and the wellness of all of us on this planet.

We conduct informational exchange meetings with agribusiness leaders from all over the world who visit us to learn more about our operations and how we carry out our commitment of environmental stewardship and regulatory compliance.


The boundaries between suburban and rural and between “the city” and “the farm” continue to blur as our population grows. One can no longer farm, do business or plan without this awareness and respect for the relationships and interdependencies between agriculture, communities and the environment.

We believe it is essential to be good environmental and community stewards. We encourage and support our employees to be active members of local, regional and national organizations that promote environmental and community values, and to serve in leadership positions whenever possible.


From local volunteer fire departments and school boards to national volunteer organization leadership roles, Tremont Group people are involved and committed to a healthy environment and solid communities that nurture and support individuals and families in worthwhile living.