Design Basis ThreatDesign Basis Threat (DBT) Description of a specific adversary and mode of attack that has a degree of likelihood of occurring.
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DestabilizedA condition in which the electrical charge of particles has been neutralized.
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Detected ContaminantAny contaminant detected at or above its detection limit.
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Detection LimitThe amount of a substance with that EPA has determined to be the minimum concentration that can be measured and reported with 99% confidence that the true value is greater than zero.
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Detention TimeThe theoretical time that a parcel of water or other liquid spends in a particular treatment unit or reservoir.
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Diatomaceous EarthA fine material made up mostly of the skeletal remains of single cell, microscopic algae with a rigid, box-like internal structure consisting mainly of silica.
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Digester CapacityThe total volume in gallons that a digester(s) can hold, or the volume used during the monitoring period, if not operating at full capacity.
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Discharge Monitoring ReportDischarge Monitoring Report (DMR) |
DisinfectantsSubstances that are added for the purpose of killing or inactivating the pathogenic (disease-causing) bacteria found in water.
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Disinfection Byproducts PrecursorsOrganic substances that combine with disinfectants to form potentially carcinogenic compounds such as HAA5’s and TTHM’s.
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