“Landfill leachate is liquid that moves through or drains from a dump or organized trash collection site. Some leachate exists on its own, usually a result of natural decomposition, liquids and chemicals that have been discarded also contribute. The biggest source of leachate is rainwater … when rain hits collected trash, it tends to pool up.”

– wiseGEEK, What is Landfill Leachate?

Lack of or improper management of leachate poses the risk of contaminating surface and groundwater near a landfill site. Many modern landfills are constructed with impermeable bottoms designed to contain leachate.

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What is Landfill Leachate? http://www.wisegeek.org/what-is-landfill-leachate.htm/. Retrieved December 15, 2014.