This, and the raw sewage from Mexico, and the butchered animal parts from the seaside slaughterhouses, the pathogens: intensifying right next to the ingredients of your salad. The area which drains into the Salton Sea is where Americans grow their winter fruits and vegetables.
Cleaning up rivers and lakes isn't that hard. One idea out there - pipe in clean salt water from the Sea of Cortez to keep the salt levels low and the water clean.
The strangest thing is that all those people in the Imperial Valley, wouldn't they want to do anything to clean up their backyard? Are they just sitting in their lawn chairs, looking at the sun, building monuments to their own salvation?