Hi Virginia, 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:

Clackamas County Extension
200 Warner Milne Road
Oregon City, OR 97045
Hours of operation: Mon - Fri: 8:00 am-4:30 pm
Phone:<personal data hidden>

Website: https://extension.oregonstate.edu/clackamas

Thank you for reaching out to Ask Extension!