Glossary & Terminology

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Leaching

The process by which chemicals from the walls of a container enter into the water in the container.

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MCL

Maximum Contaminant Level; the maximum level recommended by federal law for a particular water pollutant.

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MCLG

Maximum Contaminant Level Goal; the optimum maximum contaminate level in the future, for a particular water pollutant.

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Membrane

A thin material that is porous enough to reject pollutants while allowing water to pass through thus purifying the water

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mg/l Milligrams per liter

A measure of the amount of a substance in water. The equivalent to parts per million.

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Micron

A shortened term for one micrometer. One millionth of a meter.

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Mutagen

A substance that causes or contributes to genetic mutation.

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NDWR

National Drinking Water Regulations, as established by the Safe Drinking Water Act of 1974.

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NOC

Naturally occurring organic chemical.

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Nominal filter rating

Refers to the smallest particle size that a filter will trap most of. For example, a 5-micron nominal filter might trap 95 percent of all particles 5 microns or larger.

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