This shows the specialized terms used in EarthWise Academy. This section contains all the definitions used in the various course glossaries used by each course.
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Entries starting with: D
Design Basis Threat
Design Basis Threat (DBT)
Description of a specific adversary and mode of attack that has a degree of likelihood of occurring.
A condition in which the electrical charge of particles has been neutralized.
Any contaminant detected at or above its detection limit.
The 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.
The theoretical time that a parcel of water or other liquid spends in a particular treatment unit or reservoir.
A 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.
The total volume in gallons that a digester(s) can hold, or the volume used during the monitoring period, if not operating at full capacity.
Discharge Monitoring Report
Discharge Monitoring Report (DMR)
Substances that are added for the purpose of killing or inactivating the pathogenic (disease-causing) bacteria found in water.
Disinfection Byproducts Precursors
Organic substances that combine with disinfectants to form potentially carcinogenic compounds such as HAA5’s and TTHM’s.