In 2018, more than 119 million gallons of sewage overflowed onto the streets and lakes of Dallas-Fort Worth. That's 119,090,756 gallons, to be exact, over more than 1,700 overflow incidents. Let's break down those numbers a little bit further: That's the number of gallons of sewage that overflowed in the largest single incident last year, which happened in Garland on Oct.