<P> Leachate is a widely used term in the environmental sciences where it has the specific meaning of a liquid that has dissolved or entrained environmentally harmful substances that may then enter the environment . It is most commonly used in the context of land - filling of putrescible or industrial waste . </P> <P> In the narrow environmental context leachate is therefore any liquid material that drains from land or stockpiled material and contains significantly elevated concentrations of undesirable material derived from the material that it has passed through . </P> <P> Leachate from a landfill varies widely in composition depending on the age of the landfill and the type of waste that it contains . It usually contains both dissolved and suspended material . The generation of leachate is caused principally by precipitation percolating through waste deposited in a landfill . Once in contact with decomposing solid waste, the percolating water becomes contaminated, and if it then flows out of the waste material it is termed leachate . Additional leachate volume is produced during this decomposition of carbonaceous material producing a wide range of other materials including methane, carbon dioxide and a complex mixture of organic acids, aldehydes, alcohols and simple sugars . </P> <P> The risks of leachate generation can be mitigated by properly designed and engineered landfill sites, such as those that are constructed on geologically impermeable materials or sites that use impermeable liners made of geomembranes or engineered clay . The use of linings is now mandatory within the United States, Australia and the European Union except where the waste is deemed inert . In addition, most toxic and difficult materials are now specifically excluded from landfilling . However, despite much stricter statutory controls, leachates from modern sites are often found to contain a range of contaminants stemming from illegal activity or legally discarded household and domestic products . </P>

Liquid produced by the interaction of rainwater with solid waste