Soil Nutrient Testing Program

All soil samples must be THREE POUNDS.

King Conservation District provides basic soil nutrient tests for all residents and municipalities in our service area (see sidebar). KCD’s soil nutrient testing program covers commercial farms, pastures, parks, home yards and community gardens.

Soil samples can be mailed to KCD’s office Monday through Thursday or put in our drop box outside KCD’s office door located inside the building at 800 SW 39th St, Suite 150, Renton, WA 98057 during the hours of 8:30am to 5:00pm, Monday through Friday.

Each resident in our service area is eligible for a total of five free basic soil nutrient tests for properties they either own or rent. Additional soil tests can be ordered for $30 each.

Download KCD’s Soil Testing Fact Sheet PDF

KCD Soil Sample Submittal Form

Translated Soil Documents

Soil Nutrient Testing Fact Sheet Understanding Your Soil
Soil Testing – ADA English Understanding Your Soil – ADA English
माटोको जाँचसम्बन्धी कार्यक्रमका निर्देशनहरू – Nepali माटोको जाँचसम्बन्धी व्याख्या गर्ने गाइड – Nepali
Инструкции по программе тестирования почвы – Russian Руководство по интерпретации результатов анализа почвы – Russian
Tilmaamaha Barnaamijka Tijaabada Ciida – Somali Tusmada Turjumaada Tijaabada Ciida – Somali
Instrucciones del programa de pruebas de tierra – Spanish Guía de interpretación de pruebas de tierra – Spanish
土壤檢測計劃說明 – Traditional Chinese 土壤檢測解讀指南 – Traditional Chinese
Інструкція до програми тестування ґрунту – Ukranian Посібник з інтерпретації результатів аналізу ґрунту – Ukranian
Hướng Dẫn về Chương Trình Xét Nghiệm Đất – Vietnamese Hướng Dẫn Đọc Kết Quả Xét Nghiệm Đất – Vietnamese

We will send your soil samples to A and L Western Laboratories to test for Nitrogen, Phosphate, Potassium, Magnesium, Calcium, Sodium, Organic Matter, pH, and Cation Exchange Capacity. The laboratory will analyze your soils and provide recommendations specific to your plant needs.

KCD pays only for basic nutrient tests. Additional tests for heavy metals or other soil properties are charged separately. See the Analytical Services section of the A and L Laboratories website for prices.

It’s easy to collect soil samples. See our Soil Sampling Instructions and Submittal Form for details. Read the instructions carefully and fill out the submittal form so we get complete information about your soil sample. Be sure that:

  • Each sample has at least THREE POUNDS of material
  • The forms are properly filled out
  • The sample bags are filled out on the outside of the bag

It’s important that soil samples are fresh, so please don’t mail them on Friday or Saturday so they don’t sit at the Post Office for a few days. Soil nutrient test results are generally available within two to three weeks from when we send them to the lab.

KCD recommends testing soils regularly. Whether you are growing forage for livestock, gardening, maintaining an orchard or managing a woodlot for wood production, proper soil sampling will allow you to:

  • Apply the correct amount of fertilizer for the plants you are growing.
  • Prevent surface and ground water from being contaminated by excess fertilizers.
  • Ensure that soil nutrients and other conditions (such as soil acidity) affecting plant growth are present in the right amounts.

Results of proper soil nutrient management can include:

  • Increased plant growth, yields and quality.
  • Less purchased livestock feed and fertilizer.
  • Better utilization of manure on your pastures, lawns and gardens.

For more information contact

Additional Helpful Information

KCD Soil Contaminant Testing Fact Sheet

How to Have a Dynamite Lawn by Ciscoe Morris (PDF)

Soil Testing Information from Grow Organic/Peaceful Valley Farm Supply

Understanding Your Soil Test Report by Peaceful Valley Farm Supply (PDF)

Technical Advice Fact Sheet 12 – Soil Testing from A Greener World (PDF)

Interpreting Your Soil Sample Report from Penn State University Extension (PDF)

Soil Amendments and Fertilizers from University of Maryland Extension

Soil Amendments and Fertilizers from Grow Smart, Grow Safe®

Soil Testing: A Guide for Farms with Diverse Vegetable Crops from Washington State University Extension



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