Poor old Wichita Falls.
The city of about 105,000 people has become the butt of late-night jokes and the subject of shocked headlines since officials decided to turn to treated sewer water to fill residents' drinking glasses.
Turns out, though, the joke is on just about everybody else. Because for the large chunk of population that lives downstream from a big city and whose water supply flows through a river, more than a few drops of the water in their glasses was probably once in someone else's toilet.
Let’s start with Houston, which, as Texas State University ...