One-year ACS data products on American FactFinder, including detailed tables and data profiles, are subject to the data quality filtering applied to prevent the poorest quality estimates from being published. This can be frustrating for users if estimates are published in one year but are filtered out the next, i.e., the filtering results are inconsistent. This research aims to examine the frequency and effects of filtering over time using 1-year estimates from 2009 through 2013.