Conductivity

The ability of a substance to conduct or transmit heat,
electricity, or sound. Relating to water quality, it is a
measure of dissolved minerals and/or ions in the water.
Typically measured in micromhos per centimeter (µmhos/cm).
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If baseline levels of conductivity are established for an area,
this measurement can be used to detect possible pollution
discharges that have a high ionic strength. This would include
manure directly from livestock in streams, land application, or
releases from storage basins.