Soil labs by state
Illinois
Illinois Extension has current homeowner guidance for collecting soil samples, but its official soil-lab page points residents to certified commercial labs and several out-of-state land-grant university labs rather than a public University of Illinois soil-testing lab. For Illinois homeowners, the statewide official path is to choose a lab, follow that lab’s instructions, mail the sample, and use Illinois Extension’s county office finder for local help.
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
- Find your county Extension office
- Official page →
Official resources in Illinois
Official Illinois homeowner instructions for collecting soil, preparing a sample, and mailing it to a lab.
Official Illinois Extension page listing ALTA-certified commercial labs and several land-grant university soil labs.
Statewide county and office finder for University of Illinois Extension offices.
Official certified-labs directory that Illinois Extension tells residents to use when choosing a soil lab.
Key facts for Illinois
- Illinois Extension says it provides guidelines for collecting and submitting homeowner soil samples (Collecting Soil Samples).
- Illinois’s official homeowner instructions say to prepare samples for mailing by mixing subsamples and placing about 1–2 cups in a plastic bag or lab bag (Collecting Soil Samples).
- Illinois Extension tells residents to use labs certified by the Agricultural Laboratory Testing Association (Soil Test Labs).
- Illinois Extension’s soil-lab page lists several land-grant university soil labs, including Missouri, Wisconsin, Kansas State, Kentucky, and Minnesota (Soil Test Labs).
- Illinois Extension’s county office finder lets residents select an Extension office by county or by office from a statewide map/list (Where We Serve).
- An official Illinois Extension podcast states that the University of Illinois does not have its own soils testing lab (Good Growing podcast, Episode 204).
What to do next
- Pick a lab first from Illinois Extension’s Soil Test Labs page or ALTA’s Certified Labs page, then follow that lab’s exact submission and payment instructions.
- Plan on direct mail unless your county Extension office says otherwise; use the Illinois Extension office finder to ask whether your local office currently offers sample bags or a drop-off event.
- If your home is in an older urban or developed area, ask the lab about heavy-metal or lead testing in addition to routine fertility testing.
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