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Vendor Resources & Purchasing Information

The City has developed this page to assist our vendors with frequently asked questions and requested information.  If you need additional information please do not hesitate to contact us at the information provided below.


Vendor List

The City's vendor list is perpetually open. Vendors can request to be added to the City's vendor list by submitting a completed W-9 to accountspayable@cityofprosser.com.


Link to purchase history

Current Vendor List


Small Works Roster

For more information on the Small Works Roster, please visit the City's Small Works Roster Page.


Purchase Order Terms and Conditions

Departments are required to provide purchase orders for all purchase in the amount of $2,500 or more. Please follow the link to review the City's Purchase Order Terms and Conditions.


Payment Schedule

Invoices are usually processed for payment within 30-days of receipt. City Council approves payments on the 2nd and 4th Tuesdays of each month. Checks are then mailed the following morning.


All invoices should be mailed to :

City of Prosser

PO Box 1639

Prosser, WA 99350






Questions Regarding Payment Status

If you have questions regarding payment status, please review the check register to see if a payment has been issued. If you have other questions, contact Accounts Payable at 509-786-2332 or at accountspayable@cityofprosser.com


Lost Check

The City mails it's payments via the United States Postal Service. If for some reason, a city issued check is lost or missing, a duplicate check can be issued by having an affidavit filed with the City. Please complete the Affidavit FormThis form requires that you submit certain information about the lost check (for example check date and number), you can find this information by searching the check register for the payment. It is required that an original signed copy of the completed form be return to the following address:


City of Prosser

PO Box 1639

Prosser, WA 99350


Once the original statement is received at our office, a new check will be sent to you.



All deliveries shall be submitted FOB destination, ready for regular and safe operation, unless otherwise requested. Delivery location will be specified at time of order.


City of Prosser's W-9