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We include active faults in this database as well as other faults that have evidence for movement within the Quaternary time period (last 2.58 million years) or suspected movement in the Quaternary (also called class B), because they all have the potential to create damaging earthquakes sometime in the future within a timeframe that matters to humans. For most faults in Washington, there is not enough evidence of past earthquake activity to forecast the timing of future events. Throughout scientific history in Washington state, different interpretations of Quaternary faults have resulted from different mapping methods and scales of investigation. Dataset users will benefit from a full investigation of sources cited, reading other past work, and developing an understanding of the breadth of study types for any particular fault of interest. For geologic mapping, tectonic studies, and other scientific investigations, this database is best used for understanding the orientation of, connectivity between, and deformation along Washington fault networks in the present. For earthquake hazards characterization, this database is best used in reconnaisance-scale investigations, to identify regions closer or farther away from active faults in a qualitative sense, or in probabilistic seismic hazard analysis studies (PSHA) that consider the hazards that faults pose for a given area in a probabilistic sense. The WGS does not advise uses of this database that aim to quantify distance of a location of interest to a particular fault or that rely on high precision fault placement with respect to specific properties. 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