There's gold in them thar sewers! An estimated $1.8 million of gold flows through Switzerland’s sewer system every year, according to a new study in Environmental Science & Technology. The precious metal most likely comes from the country’s numerous gold-refining plants, but the scientists believe that its concentration is too low to make it economically worthwhile to try and recover it, The Washington Post reports. The study also found about $1.7 million worth of silver. That’s in line with previous reports that have found similar numbers for U.S. cities and a Japanese sewage incinerator, which purportedly collects 2 pounds of gold from every 1200 pounds of ash. Not a bad haul.