The SNAP Quality Control (QC) database contains detailed information on the economic and demographic circumstances of a sample of households selected for review as part of the SNAP QC System. The data include households from the 50 states, the District of Columbia, Guam, and the U.S. Virgin Islands. Data are available from 1996 through the most recent year for which QC error rates are available. Data is hosted by Mathematica, under contract with FNS.