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black water

American  

noun

  1. wastewater from toilets, garbage disposal, and industrial processes.


black water British  

noun

  1. household waste water that cannot be reused without purification Compare grey water

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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A 2023 report showed that 8,657 outdoor toileting incidents were recorded across the Highlands that year, including 126 times where "black water" toilet waste from campervans had been dumped.

From BBC Dec. 9, 2025

Every vehicle will go through an inspection that looks for potential risks, including black mold, electrical concerns, damaged fuel lines and gray or black water leaks, Grant said.

From Seattle Times Jul. 4, 2023

They are called black water rivers because the tannins from all the leaves turn the water into a dark iced tea color that looks very dark when deep.

From Salon Jun. 3, 2023

“Intensive cattle operations that are not careful about their waste had that waste spread beyond their properties, with nearby puddles of black water because of the waste,” he said.

From Los Angeles Times Apr. 3, 2023

Mr. Grin and the others had gathered beside an old stone jetty that stretched out into the black water.

From "Stormbreaker" by Anthony Horowitz

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