I wasn't sure if just the pipeline runs nearby the U.S. and it runs out of Mexico along the border or if it runs out of Mexico into the U.S. The article was not specific enough, but I thought I understood the same as you. Why on earth would Mexico pump 21 million gallons of raw sewage into the U.S.? Or really: why would the U.S. allow that?

>I'm a little surprised we are importing raw sewage from Mexico ...
>
>>http://www.cnn.com/2010/WORLD/americas/10/12/mexico.us.sewage.line/index.html
>>
>>I bet the people digging that tunnel were unpleasantly surprised :o)
>>
>>SNIPPET:
>>
>>Utility crews struggled early Tuesday to stem the flow from a sewage line near Arizona damaged by suspected drug smugglers who were attempting to dig a tunnel under the Mexico-U.S. border, officials said.
>>
>>The 30-inch line, located on the Mexican side of the border, runs north and carries raw sewage from Mexico, carrying about 21 million gallons of it a day, said Public Works Director Flavio Gonzales of Nogales Utility in Arizona.