A facility designed and managed to utilize the natural channel of a stream to store water underground through artificial and controlled releases of water other than surface water naturally present in the stream. Surface water flowing in its natural channel is not a managed underground storage facility.
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Managed underground storage facility
Maximum contaminant level
A primary maximum contaminant level (MCL) represents a drinking water standard set by the Safe Drinking Water Act and enforced by the EPA. An MCL reflects a national primary drinking water regulation in the form of an enforceable numeric drinking water standard representing the maximum permissible level of a constituent in a public water system. A secondary maximum contaminant level (SMCL) represents a non-enforceable numeric standard for the aesthetic quality of drinking water, such as taste, odor, or color. Waters with contaminants above a SMCL are not typically expected to cause health problems.
Maximum storage capacity
Total storage space in a reservoir below the maximum attainable water surface elevation, including any surcharge storage.
Metamorphic rock
A rock that is the product of heat, pressure, and chemical activity so that some or all of its minerals are re-crystallized and may show preferred orientation.
Monitor well
A well that is designed and drilled for the purpose of monitoring water quality within a specific depth interval. A.A.C. R12-15-801(1).
Municipal demand
All non-agricultural uses of water supplied by a city, town, private water company, irrigation district, domestic water improvement district, water cooperative or private domestic well.
Municipal provider
A city, town, private water company or irrigation district that supplies water for municipal use.