A de minimis settlement, in general, is a settlement between EPA and those parties who are responsible for a minimal contribution, in amount and toxicity, of the hazardous substances at a Superfund site , or who bought the site without knowledge of the contamination and did not cause or contribute to the contamination.
Superfund site
The United States federal Superfund law, officially the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), established the federal Superfund program, administered by the Environmental Protection Agency (EPA).
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