Top: Science: Earth Sciences: Hydrology: Terminology: M



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maximum contaminant level

(MCL)--the designation given by the U.S. Environmental Protection Agency (EPA) to water-quality standards promulgated under the Safe Drinking Water Act. The MCL is the greatest amount of a contaminant that can be present in drinking water without causing a risk to human health.


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milligram

(mg)--One-thousandth of a gram.


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milligrams per liter

(mg/l)--a unit of the concentration of a constituent in water or wastewater. It represents 0.001 gram of a constituent in 1 liter of water. It is approximately equal to one part per million (PPM).


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million gallons per day

(Mgd)--a rate of flow of water equal to 133,680.56 cubic feet per day, or 1.5472 cubic feet per second, or 3.0689 acre-feet per day. A flow of one million gallons per day for one year equals 1,120 acre-feet (365 million gallons).


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mining water use

--water use during quarrying rocks and extracting minerals from the land.


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municipal water system

--a water system that has at least five service connections or which regularly serves 25 individuals for 60 days; also called a public water system 



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