Apparently some sand at beaches is contaminated by benign E.Coli and other fecal matter bacteria. Although the source of it is disputed and largely unknown, it might be from the seagulls snacking on left over food and then defecating or from the ocean itself. Beach sand has in some rare cases been linked to gastrointestinal disorders.
A large source of beach sand pollution stems from storm water runoff. This runoff accrues from rain washing chemicals, trash, and fecal/decomposing matter from streets and paved areas into the storm water systems, which then empty at the beach and can become trapped in sand layers. Another point source of sand pollution would be agricultural run off that would be deposited into coastal areas and then washed up on the shore.
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