Our office – UC Cooperative Extension (UCCE) and the County Dept. of Agriculture does not provide any residential soil testing services.
There’s a variety of DIY tests available at home improvement and hardware stores.
A variety of soil tests are available for a fee from commercial analytical laboratories. The names of some companies that do soil analysis are available online at https://ucanr.edu/sites/sdmastergardeners/files/401775.pdf
Before spending the money on testing, you may want to consider why you’re getting the soil tested. For soil tests to be informative about a property, generally you’ll need multiple samples for accuracy, and that can add up financially. While soil testing is often useful for commercial growers who are cultivating larger areas of land with larger quantities of fertilizers, minerals, and water, the home grower looking to start a garden may find a simple Mason jar test and handling their soil themselves is enough to determine what kind of soil they have and what kinds of plants would do best there. Additionally, San Diego has a searchable soil survey website available where folks can enter their address and see a generalized report on the type of soil in their area.
If your existing plants are not doing well and you're considering a soil test, first refer to the UC IPM's Common Nutrient Deficiencies page or the UC IPM's Plant Problem Diagnostic Tool. Different nutrient deficiencies show up as different discolorations in plants, so identifying the pattern in the plant may be more informative (and less expensive) than a soil test. Individual nutrients like iron and nitrogen are available at nurseries and other places. You can also send a photo of the plant to us at the Hotline and we'll help you identify the issue.