31 127 | El Paso to become first major U.S. city to use treated sewage water for drinking water, November 30, 2018 news

This news about El Paso comes November 30, the day leaving 31-days left in the year.

 Adding to the riddle is the fact that 'sewage water' sums to 127, the 31st prime number.

https://www.cnn.com/2018/11/30/health/water-climate-change-el-paso/index.html