The floodwaters covering the former Semá:th X̱ó:tsa, or Sumas Lake — now called Sumas Prairie — contained 379 chemical components and bacteria, researchers found. Two-thirds were created by humans, including several that aren't found in nature.

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Netherlands , The Netherlands , Peter Ross , Murray Ned , Lower Fraser Fisheries Alliance , Raincoast Conservation Foundation , Sumas Lake , Sumas Prairie , First Nations , First Nation , Fraser Valley ,