Some Extension offices offer pH testing. You can learn more about other forms of testing and testing locations by checking out this featured question: https://extension.oregonstate.edu/ask-expert/featured/how-do-i-test-my-soil

You can contact your local Extension office to inquire about soil testing. Here's the information for your county office:

Yamhill County Master Gardeners | OSU Extension Service

For mail-in testing options, here are soil testing services commonly used for garden soil testing:

• Simply Soil Testing (just for gardens & landscapes)
• A & L Western Labs (garden packages but also serves commercial farmers)
• Western Laboratories, Inc. (garden packages but also serves commercial farmers)
• Farm and garden stores in your area may sell mail-in kits (check places like Wilco, etc.)

Check the company’s website for fees and instructions on mailing samples. Make sure to send enough soil. 

Remember to list what plant you want to grow in the area (vegetables, lawn, fruit trees, blueberries, etc.) and request recommendations with the soil test. Then, you will get specific advice on adjusting the fertilizer rates and pH for optimum growth.

Thank you for reaching out to Ask Extension!