An etching by William Heath depicting a woman dropping her tea-cup in horror upon discovering the monstrous contents found in a magnified drop of Thames water. In the nineteenth century, sewage and waste contaminated the River Thames in London, making it a prime source of water-borne diseases such as cholera and typhoid.
From Wellcome Collection via Cabinet Magazine issue 44
Waste water often contains residue of different substances flushed out of homes. In the area of Puget Sound, a team from the University of Washington found traces of spices and flavourings in the sound’s inland waterways – artificial vanilla being the most pronounced of all the flavours. On average, the team found an about six milligrams of vanilla per litre in the water sampled.
Click here to read about more substances found in water!