Last edited 02 Apr 2026

Contaminant

Approved document C: Site preparation and resistance to contaminants and moisture, 2004 edition incorporating 2010 and 2013 amendments defines contaminant as: ‘Any substance which is or may become harmful to persons or buildings, including substances which are corrosive, explosive, flammable, radioactive or toxic.’

The Biodiversity: The UK Steering Group Report (1995–1999) Volume 1 and Volume 2 accessed via the Joint Nature Conservation Committee defines a contaminant as "A substance which is present in elevated concentrations, but not at levels which cause harm or exceed an environmental quality standard."

See also: Contaminated land.

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