× This site uses cookies. By continuing to browse the site, you are agreeing to our use of cookies. Read more from here
Home  /  RESPONSIBILITY  /  Environment and climate  /  Environmental impacts  /  Emissions to water and soil


The emissions of radioactive fission and activation products into water amounted to 0.09% and tritium emissions to 13.5% of the limit value specified by the authorities.

Radioactive emissions to water20172016201520142013
Fission and activation products TBq0.00030.00020.00010.000080.00009
% of allowed amount
Tritium TBq2.462.322.051.561.46
% of allowed amount 13.512.711.28.58.0

Sanitary wastewater is treated at the Olkiluoto wastewater treatment plant before it is discharged into the sea. In 2017, the total volume of sanitary water treated was 97,207 m3. The phosphorus load discharged into the sea was 12 kg and the nitrogen load 5,840 kg. The biological oxygen demand (BOD7ATU) was 767 kg. The treatment of sanitary wastewater is based on the permit conditions specified for the purification efficiency and loads discharged into water bodies, as well as regulatory requirements. Emissions from the sanitary wastewater treatment plant were a fraction of the nutrient load of River Eurajoki running to the north of Olkiluoto. Water quality measurements are carried out by an external operator.

Sanitary waste water treatment20172016201520142013
Amount of water (m3)97,20788,60677,09366,38984,025
Concentration (mg/l) 1)

Treatment efficiency average (%) 1)

Load on sea area (kg)

Water treatment chemicals (t) 2)

1) The permit regulation for the sanitary waste water: The maximum BOD7ATU value of waste water discharged into the seas is 13 mg O2/l and the maximum phosphorus concentration is 0,52 mg P/l. The minimum treating efficiency for the BOD7ATU value and phosphorus is 95 %. All values are calculated as annual averages. 2) Chemicals used for the treatment of sanitary waste water.

Emissions to the soil

As a result of the failure of a hydraulic hose, some 40 litres of oil leaked from a forklift to a paved area. All the oil was recovered and the spill absorption materials were sent to an appropriate waste treatment.