A sign at a sewage pond at an unpermitted trailer park in Mecca, Calif., attests to the hazard there. Squalid housing for migrant farmworkers has for decades been a reality in many places where crops are grown. But the situation in the Coachella Valley, 150 miles southeast of Los Angeles, is unique for both its severity and for the hundreds of hidden and largely unplanned trailer parks that house workers. (Associated Press)
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