New York City tap water isn't kosher:

New York, NY(UPI) -- Sales of water filters to Orthodox Jews in New York are brisk since word went out the city's tap water contains microscopic harmless crustaceans.

Rabbis recently discovered there are tiny creatures, called copepods, in the unfiltered water that streams into the city from upstate, the New York Times said Tuesday.

Two weeks ago, Yair Hoffman and other Orthodox Jews inspected city tap water under a microscope. They saw copepods, millimeter-long zooplankton that are common in the ocean and in groundwater.

"There's absolutely no health risk," said Charles Sturcken, a spokesman for the city Department of Environmental Protection.