Mexico has been doing this for decades. In my native town of Coronado we had a saying about Imperial Beach — “down in IB, where the debris meets the sea” — because of this very problem.
Mexicans released an estimated 143 million gallons of raw sewage into California beaches for a period spanning at least 18 days. There was no alert that it was coming. NAFTA and other international treaties that establish fair warning and other notification measures meant nothing to them. The sewage was pumping directly into California neighborhoods for weeks before there was any notice to tourists and home owners affected.I live just north of Tijuana where this sewage was pumped.