That article forces you to immeadiatley speculate about the source of the fire retardant? Could it be from various ships at sea performing fire drills? Is it runoff from fires within cities where the fire department uses this stuff, ...and the sewage treatment cannot remove it?

Any firemen care to comment on the common uses, frequency of use of retardants?
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You know something bad is going to happen when you hear..."Hey, hold my beer and watch this"