County Of Sonoma › Development Services › Sonoma Public Infrastructure › Divisions › Purchasing: Working with the County

Purchasing: Working with the County

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The Sonoma Public Infrastructure Purchasing Division handles all purchasing and contracting for County departments, including goods, services, construction, and surplus property. Guided by the Purchasing Agent, the team ensures materials and services are obtained ethically, cost-effectively, and on time to support County operations and infrastructure projects. Suppliers are welcome to connect with Purchasing Division Buyers about the County’s needs.


Supplier Portal	Supplier Registration Support	Supplier Required Insurance Certificates
Your gateway to doing business with Sonoma County – register, view opportunities, and submit bids online	Questions about registration or bidding? Our team can guide you.	Upload your required insurance certificates here to keep your Supplier Portal account complete and compliant.

Below are helpful links, resources, guidance, and agreements to assist suppliers ready to connect with the County on infrastructure projects.

Use these quick links to log into the supplier portal, connect with our support team, or download important reference documents.

How will I know about the County’s bid opportunities?

You will receive emailed notifications of bid opportunities based on the commodity category codes you select during the registration process.

Registration in the Supplier Portal does not guarantee the receipt of electronic notification for all applicable solicitations.
Suppliers should routinely check our Supplier Portal for a list of current business opportunities. County of Sonoma Suppliers are responsible for self-managing and updating their accounts online.

Accounts should be checked regularly to assure your company’s contact information and category code selection is up to date.

I’m a prospective Supplier and haven’t done business with the County before. How do I register?

Have your Taxpayer ID number or SSN on hand.

Navigate to the Supplier Portal. We recommend you open the Bidder Registration Instructions in a new window, or print them to use during registration.

Please be sure to review and select appropriate commodity category codes.

I’m currently a County Vendor. Do I have to register again in the new system?

If you registered with the County before July 1, 2014, you are not registered in our new system. Please register in the new Supplier Portal in order to receive emailed bid notifications.

Have your Taxpayer ID or Social Security Number on hand, along with your current Vendor ID number. If you no longer have your Vendor ID number available, please email our Supplier Desk.
Navigate to the Supplier Portal. We recommend you open the Supplier Registration Instructions in a new window, or print them to use during registration.
Click on Register as a Supplier and follow the registration instructions. Please be sure to review and select appropriate commodity category codes.

If you registered in the new system after July 1, 2014, you do not need to re-register. However, you do need to log in to the Supplier Portal and update your account.

Navigate to the Supplier Portal. We recommend you open the Supplier Account Management link in a new window, or print out to use during registration.
Login with your User ID and password. If you have misplaced them, send an email to our Supplier Desk. When you receive your User ID, reset your password using the link on the Supplier Portal and login.
In order to receive emailed bid notifications, you must edit existing contacts, designate a contact to receive emailed bid notifications, and select category codes for the goods and/or services you offer.

What can I do with my online Supplier account?

Review bidding opportunities and place bids
View invoices, payments, account balances, and purchase orders
Update your company contact information, including email addresses
Set up additional user accounts for employees based on the type of access your business requests

Whom should I contact if I cannot get into the system or have other technical issues?

Please send an email to our Supplier Desk at supplier-desk@sonomacounty.gov.

Single/Sole Source Purchases

The Single/Sole Source Purchases Report reflects total purchases from December 1, 2025 to January 31, 2026. The total number and spend reflects the total number of payments made for this time period in comparison to Single/Sole Source Purchases for the period.