President Trump on Thursday cited the growing water debt that Mexico owes the United States under a treaty governing the use of the countries’ shared rivers.

Under the treaty, Mexico is to pay the United States 1.75 million acre-feet of water to the Rio Grande over a five-year cycle ...

An additional 5 million gallons of sewage a day is now flowing into the Tijuana River and across the border, something that ...

East Tijuana residents living alongside factories teamed up with U.S.-based researchers to document polluted water flowing down their streets.