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Johnson County

Free Soil Testing for Johnson County Residents

The first key to lawn and garden success is knowing soil fertility. Johnson County residents are encouraged to take advantage of a free routine soil analysis which tests the pH, phosphorus and potassium levels of the soil, offered by Johnson County K- State Research and Extension through a grant with Johnson County Stormwater Management. The basic fertility test, sufficient for most homeowner lawns and gardens, normally costs $12.

“A soil test can save you money on lawn or garden chemicals, and decrease runoff that pollutes our waterways,” Dennis Patton, county horticulture agent, stressed.

Even if you got a free test last year you're eligible for another. Johnson County homeowners are eligible to receive one free test per household per year. Johnson County agriculture producers, which includes pastures, row crops and commercial horticulture, are eligible to receive up to 10 free agriculture soil tests.

It takes 2 – 3 weeks to get the results back from K-State labs so don’t delay. Samples need to be brought or mailed to the Johnson County Extension office at 11811 S. Sunset Drive, Suite 1500, Olathe, KS 66061.

To learn the specific procedures for collecting a proper sample, or to learn of additional tests that are available for a nominal fee, click here or call (913) 715-7000.


Click Here for Instructions on How to Take A Soil Sample

Available Tests and Fee Schedule

Many different analyses are conducted at the KSU Soil Testing Lab.

The most common tests for Kansas soils are for pH, phosphorus (P), potassium (K), nitrate (NO3), and organic matter.

Package #1 - $12  (pH, P, K) This is the basic fertility test, sufficient for most homeowner lawns and gardens.

Note: Johnson County residents get one free basic soil test per household address.

Package #2 - $20  (pH, P, K, NO3, organic matter). For soils that might have too much nitrogen or organic matter due to continuous heavy applications of fertilizer, compost, or manure.

Other Individual Tests: (rarely needed for the homeowner)

Individual Trace Elements: $3 per element

  • Calcium (Ca),

  • Magnesium (Mg),

  • Sodium (Na),

  • Iron (Fe),

  • Zinc (Zn),

  • Copper (Cu),

  • Manganese (Mn),

  • Sulfate (SO4),

  • Chloride (Cl),

  • Aluminum (Al)

Nitrates: $5

Ammonium: $5

Heavy Metals Arsenic, Cadmium, Chromium, Lead:

  • First metal $15.

  • Additional metals $3 each.

  • Complete panel: $20

Organic Matter: $5

Cation Exchange Capacity: $15