HOUSTON The COVID-19 positivity rate in the city of Houston is 24.82% as of June 28, up from 15.35% on June 1. This is a particularly powerful piece of statistical information because positivity rate takes into account the increased testing as it has become more widely available. Positivity rate is the number of reported positive COVID-19 cases divided by the reported total number of tests performed. In Harris County, the positivity rate is up to 25.17% on June 28, up from 7.15% on June 1. The states positivity rate over the month of June jumped from 5.4 percent on June 1 to 13.58 percent on June 30.