Minute 242, an addenda to the U.S.-Mexico Colorado River Treaty, (pdf) contemplated construction of a drain to safely carry high salinity U.S. drainage past municipal and agricultural intakes and dump it into a slough near the Sea of Cortez.
It was a time of tension between the two countries over the salinity issue. (Evan Ward’s Border Oasis tells the tale.) How tense? It is fascinating to imagine the back story that left Mexico to feel this language needed to be included in the 1973 agreement:
It is understood that no radioactive material or nuclear wastes shall be discharged through this drain.