More cities are exploring the use of groundwater across the Rio Grande Valley, including Raymondville, Mercedes, and Brownsville.McAllen just announced their newest groundwater project.McAllen Utilities Director Mark Vega said the city uses about 28 million gallons per day from the Rio Grande.The city broke ground on new groundwater test wells that they hope will produce an additional 8 million gallons of water.

Source: McAllen breaks ground on new groundwater project | KRGV