Soil labs by state
Arizona
Arizona’s official University of Arizona Cooperative Extension information currently points residents to a published list of laboratories that serve homeowners, rather than a single statewide Arizona homeowner soil-testing lab. In Yavapai County, Extension offers free pH soil testing at its offices, and for more thorough testing its official gardening page specifically suggests sending samples to the Texas A&M Soil, Water and Forage Testing Laboratory. ([extension.arizona.edu](https://extension.arizona.edu/publication/laboratories-conducting-soil-plant-feed-or-water-testing))
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
- State soil lab
- Texas A&M Soil, Water and Forage Testing Laboratory
- Lab website
- Official page →
- Basic test price
- $12 per sample
- Find your county Extension office
- Official page →
Official resources in Arizona
Arizona’s current official Extension publication listing labs that serve homeowners, including Texas A&M and several Arizona commercial labs. ([extension.arizona.edu](https://extension.arizona.edu/publication/laboratories-conducting-soil-plant-feed-or-water-testing))
Official county and tribal Extension office finder for Arizona residents. ([extension.arizona.edu](https://extension.arizona.edu/local-offices))
Official land-grant university soil-testing page with urban/homeowner soil testing links and online submission options. ([soiltesting.tamu.edu](https://soiltesting.tamu.edu/soil-testing/))
Official mailing and courier instructions for sending soil samples directly to the lab. ([soiltesting.tamu.edu](https://soiltesting.tamu.edu/sampling-and-shipping-instructions/))
Official Yavapai County page explaining free pH testing at Extension offices and recommending Texas A&M for more thorough testing. ([extension.arizona.edu](https://extension.arizona.edu/local-offices/yavapai-county/yavapai-gardening?utm_source=openai))
Key facts for Arizona
- UA Cooperative Extension’s current AZ1111 publication is dated April 2025 and revised May 2026. ([extension.arizona.edu](https://extension.arizona.edu/publication/laboratories-conducting-soil-plant-feed-or-water-testing))
- AZ1111 has a section titled “Labs that serve homeowners,” and it includes Texas A&M Soil, Water and Forage Testing Laboratory. ([extension.arizona.edu](https://extension.arizona.edu/publication/laboratories-conducting-soil-plant-feed-or-water-testing))
- Texas A&M’s urban soil form says: “Please submit this completed form and payment with samples.” ([soiltesting.tamu.edu](https://soiltesting.tamu.edu/files/urbansoil.pdf))
- Texas A&M lists direct-shipping addresses for both USPS and other couriers on its official sampling and shipping page. ([soiltesting.tamu.edu](https://soiltesting.tamu.edu/sampling-and-shipping-instructions/))
- Texas A&M’s Urban and Homeowner Routine Analysis is listed at $12 per sample on the SU26 form. ([soiltesting.tamu.edu](https://soiltesting.tamu.edu/files/urbansoil.pdf))
- Yavapai County Cooperative Extension performs free pH soil testing in both offices and says to bring samples to the nearest Cooperative Extension office. ([extension.arizona.edu](https://extension.arizona.edu/local-offices/yavapai-county/yavapai-gardening?utm_source=openai))
What to do next
- First check UA’s local office finder to identify your county Extension office and whether it offers only guidance, free pH testing, or no sample intake. ([extension.arizona.edu](https://extension.arizona.edu/local-offices))
- If you want a routine nutrient test, use Texas A&M’s urban/homeowner soil form, complete payment, and ship the sample directly using the official USPS or courier address. ([soiltesting.tamu.edu](https://soiltesting.tamu.edu/soil-testing/))
- If you live in Yavapai County and only need pH, use the county’s free Soil Test Request form and bring up to three dried, labeled samples to the Extension office. ([extension.arizona.edu](https://extension.arizona.edu/sites/default/files/2026-02/SoilTestRequest2-3-2026.pdf?utm_source=openai))
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