The wastewater treatment plant is located on the north part of Peräjärvi. This is the only place where the player can legally dispose of septic waste that was pumped into the Gifu from performing septic work to avoid a hefty fine for illegal dumping. The working hours of the plant are weekdays between 8 a.m. and 4 p.m.

The cost of disposing waste is 150 mk + 0.14 mk per litre. You pay at the office's cash register and door opens to the waste disposal. You park Gifu half in it and open the valve so the waste drops on the grated floor.