Vendors Doing Business

Contra Costa County Purchasing Services

Thank you for your interest in doing business with Contra Costa County. Each year, the County procures over 165 million dollars in equipment, products and supplies through the Purchasing Division. Purchasing works closely with County departments to procure the goods and services they need. Please contact us if additional information or assistance is needed. We can be contacted at or by calling (925) 313-2120.

Getting Started

Purchasing Services is the place to start to identify business opportunities available to your business. We are open to responsible vendors who supply goods and services that are competitive, reliable and meet the County's needs.

Rules governing purchasing and contract procedures were established under the concept of open competitive bidding. Under the system, awards are made to the lowest responsible bidder who meets the published specifications, possess the capability to deliver the requested product or service, and offers the best value to the County.


Vendors should register with Purchasing Services using the Purchasing Portal website (click on logo below). Completing registration provides us with your contact information and identifies the nature of the products or services you provide. It also indicates your eligibility for business opportunity programs. Instructions for completing registration can be found in the links below.

Purchasing Services uses to notify vendors of formal solicitations. Vendor registration is free and the County does not require vendors to pay any fees.

Purchasing Portal logo

Purchasing Services Resources

  • Click on the Vendor Registration Instructions link below for step-by-step registration instructions.

Vendor Registration Instructions

  • Click on the NIGP Codes link below to search the list of codes.

NIGP Codes

  • Click on the Maintaining Vendor Information link below for instructions for changing and adding information.

Maintaining Vendor Information