KCD Soil Testing Program
King Conservation District provides basic soil tests for all residents and municipalities in our service area (see sidebar). KCD’s soil testing program covers commercial farms, pastures, parks, home yards and community gardens.
KCD is suspending the intake of soil samples for the time being due to public safety concerns presented by the COVID-19 virus. We will announce when soil samples may once again be brought or mailed in.
Thank you for your patience.
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 $20 each.
We will send your soil samples to A and L Western Laboratories in Portland, OR to test for Nitrogen, Phosphate, Potassium, Magnesium, Calcium, Sodium, Sulfur, 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.
Either drop off soil samples at our Renton office Monday through Friday, or mail your soil samples Monday through Thursday. 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 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 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.