[Hadrian (OP)]

    
Sand Can Be Polluted Even With Clean Water
By Associated Press 24 May 2006

LOS ANGELES (AP) -- Beach sand can be teeming with bacteria even when the ocean water is clean, according to a study released on Tuesday.
 
Health officials have long known that urban runoff pollutes ocean water with microbes including E. coli and enterococci bacteria found in fecal material. The study by University of California, Los Angeles researchers found microbes can grow in the sand as well, and remain there long after the ocean has flushed itself clean.

What you do speaks so loudly that I cannot hear what you say.