Free soil testing offered by WA Ecology - 4/26 & 5/17

Two upcoming soil testing events hosted by the Washington Department of Ecology will allow south end residents to check whether soils in their yards have traces of historic chemical contamination.

At the events, Ecology staff will test your soil for arsenic and lead left over by the Asarco Smelter. There is no cost for the testing. Event information below:

Shark Garden/New Starts Community Garden  

• Saturday, April 26, 2025, 12-3 p.m.

• 614 SW 120th St, Seattle, WA 98146

Federal Way Farmers Market  

• Saturday, May 17, 2025, 9 a.m. - 3 p.m.

• 1701 S. 320th, Federal Way 98003

• (In the south parking lot along 324th and the Pacific Highway)

The Asarco Smelter operated in Tacoma for almost 100 years and, even though the smelter is long gone, the pollution that came from its smokestack lives on in contaminated soils across the Puget Sound Region.

An Ecology expert outlines the steps to collecting a soil sample from your yard.

Emissions from the smelter spread arsenic and lead across a wide geographical area. Arsenic and lead are toxic metals that pose risks if you accidentally ingest or inhale contaminated soil. Children are especially at risk because their bodies are still developing and they often put dirty hands and toys in their mouths. Simple steps can reduce the risks of this contamination – such as removing your shoes when you come into your home.

Staff from Ecology’s Toxics Cleanup Program will attend both events, along with representatives from Public Health Seattle-King County and the Washington State Department of Health. Staff from Ecology’s Air Quality Program and the Washington Conservation Corps will also be there to talk about their work.

When collecting soil, it’s important to bring in samples from high-traffic areas and that you make sure the samples are free from debris like rocks or wood chips. To learn how to properly collect a soil sample, watch this video from Ecology's YouTube account.