This Washington State University Cooperative Extension factsheet explains the risks of heavy metals such as lead, cadmium, and arsenic in garden soils, with a focus on the greater Seattle-Tacoma region. It identifies locations most likely to have contamination, including sites near old painted buildings, heavily traveled roads, and areas affected by the former Tacoma smelter. The factsheet offers practical gardening tips to reduce exposure, such as growing fruiting crops, adding organic matter, liming soil, and washing produce thoroughly.Open full document
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This factsheet from Washington State University Cooperative Extension, King County, explains the health risks of heavy metals (lead, cadmium, and arsenic) in garden soils, their sources, and which locations are most likely to be affected. It provides practical guidance for gardeners on how to reduce exposure, including soil testing, crop selection, soil amendment, and safe food handling practices. Lead level thresholds and recommended actions for low, medium, and high contamination levels are also discussed.