on the russian side insufficiently treated wastewaters discharged from settlements mainly the village of wtirtsila sortavala municipal district karelia and from the vartsila metallurgical plant exert pressure local moderate but the plants use mechanical and biological treatment the biggest nutrient load originates from agriculture tonsyear of phosphorus and tonsyear of nitrogen and forestry and peat production combined are almost in the same order tonsyear of phosphorus and tonsyear of nitrogen low water periods pose problems to fisheries janisjarvi reservoir