Mexico has made a unique offer to repay a portion of the water it owes the United States, but at least one South Texas leader is balking at the plan. Mexico is offering to pay 125,000 acre-feet of water to the United States from flood overflows in Rio San Juan basin in the state of Tamaulipas, which is not part of a 1944 international water treaty between the two countries. The treaty specifies from which tributaries Mexico can deliver water so it can be stored by the United States in its two South Texas reservoirs — Amistad and Falcon. But the Rio San Juan empties into the Rio Grande south of these international reservoirs and the water cannot be captured and saved.