How to register as a vendor with Maricopa County
Maricopa County's Office of Procurement Services moved from Periscope S2G to BidNet Direct on May 1, 2025, and free BidNet registration is the only thing required to do business with the County. Small local firms can self-certify in BidNet for a program that steers department quotes under $100,000 to them.
Facts checked
Where Maricopa County posts bids
Maricopa County posts its solicitations on BidNet Direct (Maricopa County Procurement Services).[1] County solicitations are on BidNet Direct; some older county FAQ pages still point to BidSync/Periscope, which is no longer used.
Changed recently: Maricopa County switched its e-procurement platform from Periscope S2G to BidNet effective May 1, 2025.[3]
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How to register, step by step
- 01
Register on BidNet Direct free vendor registration
Start registration. Cost: Free. Choose commodity codes and notification preferences when you register; paid BidNet add-ons are not required. First-time payees must also complete payee registration in the County's Vendor Self Service system using their TIN and BidNet supplier number.[1]
- 02
Have your Contract Services qualification (construction and design firms)
Construction, architectural, engineering and related firms must complete Contract Services qualification for each discipline they want to be considered for.[1]
- 03
Choose your commodity codes
Notifications are sent by the codes in your vendor profile. Pick every code that describes your work, and revisit them when you add a service.
- 04
Get certified if you qualify
Maricopa County Small & Local Business Advocacy Program (MCSLBAP), through the Maricopa County Office of Procurement Services. No cost; self-certify in BidNet Direct. Fewer than 100 employees, no more than $4 million in gross receipts, located in Maricopa County.[2]
- 05
Watch the other buyers
State agencies in Arizona buy through the state portal, and school districts, transit agencies and utilities in the area usually post on their own sites. Registering with Maricopa County does not register you with them.
What you will typically need
Exact requirements vary by portal; the registration page linked above is the authority. Most ask for:
- Your legal business name and address exactly as registered with the state, and your federal tax ID (EIN, or SSN for some sole proprietors).
- A signed IRS Form W-9, which most buyers collect before they can pay you.
- Commodity codes (NIGP, UNSPSC or NAICS, depending on the portal) for every product and service you sell.
- A contact who will receive bid notices, plus any business license or registration the jurisdiction requires.
- Certificates of insurance and, for construction, bonding capacity: these are usually requested per bid rather than at registration.
Certification programs
| Program | Certifying office | Notes |
|---|---|---|
| Maricopa County Small & Local Business Advocacy Program (MCSLBAP) | Maricopa County Office of Procurement Services | No cost; self-certify in BidNet Direct. Fewer than 100 employees, no more than $4 million in gross receipts, located in Maricopa County. |
Tips
- Self-certify for the small and local program inside your BidNet profile so you are eligible for quotes under $100,000.
- Department-issued quotes under $100,000 not covered by an existing county contract are awarded to MCSLBAP-certified businesses whenever practicable.
Related guides
Questions
Where does Maricopa County post government bids?
Maricopa County posts its bids on BidNet Direct (Maricopa County Procurement Services) (https://www.bidnetdirect.com/arizona/maricopacounty). Other local buyers nearby, such as school districts, transit agencies and utilities, usually post separately.
How do I register as a vendor with Maricopa County?
Register through BidNet Direct free vendor registration (https://www.bidnetdirect.com/arizona/maricopacounty). Cost: Free. Choose commodity codes and notification preferences when you register; paid BidNet add-ons are not required. First-time payees must also complete payee registration in the County's Vendor Self Service system using their TIN and BidNet supplier number.
What do I need before registering with Maricopa County?
Contract Services qualification (construction and design firms): Construction, architectural, engineering and related firms must complete Contract Services qualification for each discipline they want to be considered for.
Does Maricopa County certify small or diverse businesses?
Maricopa County Small & Local Business Advocacy Program (MCSLBAP) (Maricopa County Office of Procurement Services): No cost; self-certify in BidNet Direct. Fewer than 100 employees, no more than $4 million in gross receipts, located in Maricopa County.