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Macroinvertebrate
Invertebrate animal (without back bones) large enough to be observed without the aid of a microscope or other magnification.
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.
Meander
A circuitous winding or bend in the river.
MRBC
Maumee River Basin Commission
