Soil labs by state
Washington
In Washington, the official land-grant university is Washington State University (WSU), but WSU’s own Extension materials say WSU does not test soils for homeowners. Current WSU guidance points residents to collect their own samples, send them to outside analytical laboratories, and use WSU Extension county or tribal offices for local help interpreting results and finding nearby resources.
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
Official resources in Washington
Official directory for finding your local WSU Extension county or tribal office in Washington.
Explains homeowner soil sampling, says samples must be sent to a laboratory, and notes WSU can help interpret results.
States that WSU no longer does soil samples and recommends sending samples directly to a soil-testing source.
Official WSU homeowner guide stating WSU does not test soils and that county Extension offices often have lab lists.
Current county Extension page describing soil testing workflow, sample submission to labs, and a published price range.
Key facts for Washington
- WSU says it does not test soils; homeowners must use outside laboratories. Source: https://wpcdn.web.wsu.edu/wp-extension/uploads/sites/2056/2018/10/WSUGuideToSoils.pdf
- WSU Jefferson County says, “WSU no longer does soil samples” and recommends sending samples directly to a soil-testing source. Source: https://extension.wsu.edu/jefferson/mg-home/plant-clinics/
- WSU Whatcom says once you take a sample, you must send it to a laboratory for analysis. Source: https://extension.wsu.edu/whatcom/hg/soil-testing/
- WSU Ferry County says local soil test labs generally charge $17–$90 depending on the test requested. Source: https://extension.wsu.edu/ferry/agriculture/soil-testing-fertilizer-recommendations/
- WSU’s county-and-tribal office finder lists Extension offices across Washington counties and tribes. Source: https://extension.wsu.edu/in-your-county-or-tribe/
- WSU says county Extension offices often have lists of analytical labs popular locally. Source: https://wpcdn.web.wsu.edu/wp-extension/uploads/sites/2056/2018/10/WSUGuideToSoils.pdf
What to do next
- Use the WSU county-or-tribe directory to find your local office, then ask whether they offer soil-sampling handouts, probe loans, or result interpretation.
- Collect your sample first, then mail or otherwise submit it directly to a lab from WSU’s lab-list resources; WSU pages do not show a statewide homeowner drop-off program.
- If you only need a basic garden check, compare several listed labs before ordering because WSU notes services and fees vary.
Helpful guides
- How to take a soil sample for a lab test
- University soil labs vs. private labs vs. home kits
- How to read a soil test report
- Soil pH and lime: what your test is telling you