And before that, wood pulp and tissue paper.

The name of the company comes from a river which is the location of that wood pulp mill (sold out by Nokia over 20 years ago).

Isn't nokiankoski where someone mixed up the sewage in / drinking water out lines?

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.

https://en.wikipedia.org/wiki/Nokia_water_supply_contaminati...