Just the town of Nokia. In 2007 it turned out that years ago, someone had designed a stupid arrangement at the wastewater treatment facility where a freshwater pipe was used to flush the sewage side. But if a maintenance man left the tap on, and put the sewage process going, some of the sewage would go backwards, into the freshwater side. A couple of thousand people were infected by norovirus or campylobacteria. Highly unusual.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Nokia_water_supply_contamination" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Nokia_water_supply_contaminati...</a>