Federal regulators say the Rio Grande Valley is dealing with a lack of water pouring into the river from Mexico and less water from United States sources.

The International Boundary and Water Commission shared that information at a meeting on Tuesday in Mercedes.

Six rivers flow into the Rio Grande from the U.S. and the IBWC Commissioner, Dr. Maria Elena Giner, says that flow is about two-thirds of what it was back in the 80s.

READ MORE: Efforts underway to boost water supply across the Rio Grande Valley

"We've determined that there's almost 500,000 acre-feet of water less in the river that belong to the United States from tributaries and unmeasured flows," Giner said. "We want them to ensure that they're using this information in being able to understand what the water supply availability from the Rio Grande is."

The commissioner also says the state department is reaching out to Mexican officials to ask for increases in delivery of water.

READ ALSO: Data shows Rio Grande water shortage is not just due to Mexico’s lack of water deliveries