For more than 50 years, Dow Chemical Company and Shell Oil knowingly included a highly toxic waste chemical in their fumigant pesticide products, rather than paying to dispose of it properly. The chemical, 1,2,3-trichloropropane (TCP), is a known carcinogen.
TCP is considered a "garbage" chemical because it is a by-product of the plastics manufacturing process — it is not intentionally produced. By including TCP in their fumigants, which are widely used in California to kill nematodes, Dow and Shell Oil contaminated drinking water in communities throughout the San Joaquin Valley. Several cities are now suing both companies for cleanup costs.