Our general goal is to reduce the consumption of clean water and the amount of wastewater produced by our operations, and to make the wastewater we produce less harmful. We make every effort to ensure our operations cause no harm to the lakes and other bodies of water near our facilities.

Water consumption for every produced cubic metre (m³)

Sewage (m³) in relation to produced cubic metre (m³)

The amount of sewage (m³)




Our general goal is to reduce the consumption of clean water and the amount of wastewater produced by our operations, and to make the wastewater we produce less harmful. We make every effort to ensure our operations cause no harm to the lakes and other bodies of water near our facilities.

Reducing water consumption through continuous monitoring

Our facilities in Kärkölä use groundwater for both household purposes and as process and cooling water. Most of the water is pumped from Tolkonlähde, which is a spring owned by the company, and a borewell located in the grounds of our Mäntsäläntie facility. Some of the water comes from Kärkölä’s municipal water supply network. We monitor our water consumption closely, allowing us to locate and fix leaks immediately. We constantly try to find ways to use groundwater more efficiently. Our facilities in Vierumäki and Hirvensalmi rely solely on water supplied by local water departments.

In 2017, our water consumption per cubic meter produced was 0.29 cubic meters.

In 2018, our water consumption per cubic meter produced was 0.30 cubic meters. Compared to previous years, our water consumption has remained at a very reasonable level.

Our wastewater is always processed appropriately, and we take measures to minimise its amount

Koskisen Oy has an industrial wastewater transfer agreement with the municipality of Kärkölä. All water from our log basin is pre-treated with dissolved air flotation before it enters the municipal sewer network. Under normal conditions, our operations meet the requirements of the agreement to the letter. The wastewater produced by our Vierumäki and Hirvensalmi operations is discharged to the relevant municipality’s sewer network. Our facility in Hirvensalmi also has an industrial wastewater transfer agreement with the local municipality.

Company-level goal

Reducing the amount of wastewater. Amount of wastewater max. 0.155 m³ / per m³. Maximum amount of wastewater produced annually 78,400 m³.

Outcome in 2018

The amount of wastewater was 0.095 m³ / m³ produced.

Household water

Pursuant to the decree by the Ministry of Social Affairs and Health on household water quality requirements and monitoring tests (Finlex 1352/2015), the quality of the household water used by Koskisen Kärkölä functions is monitored through a monitoring test program. This ensures that our household water is safe to use. In December 2017, a new section of the facility’s household water system was completed, ensuring a continuous supply of high-quality water for our plywood mill cafeteria.

Nature and industry in harmony at the Hähkäjärvi lake’s shores

Hähkäjärvi is a company-owned lake in the immediate vicinity of Koskisen’s Tehdastie factory. The lake was formerly used to store logs, which caused wood material to accumulate to the lake bottom, such as tree bark. As the wood material decays, it releases nutrients into the lake while also consuming oxygen. Because of this, the lake has become heavily eutrophic. The lake’s nitrogen and phosphorus concentrations are many times higher than the average, but the lake’s status is slowly improving as it is no longer subject to an external nutrient load.

We avoid drawing water from Hähkäjärvi. By the lake’s shore, we have built closed-circuit pools for circulating log irrigation water, which enable us to recycle that water for log irrigation. We do not draw any log irrigation water from Hähkäjärvi. As the irrigation water is in closed circulation, the only sources of overflow to the lake from the factory area are rainwater and clean cooling water.

Koskisen Oy’s environmental permit includes a provision for restoring Hähkäjärvi. We have commissioned reports on the need for restoration and presented them to the authorities. The latest report, the Hähkäjärvi nature report, was completed in 2014. The report concluded that the area is home, in addition to a diverse birdlife, to protected moor frogs and bats. Hähkäjärvi and its shores are a valuable habitat for many animals because of its low use, which makes it an apt example of the coexistence between industry and environment.

Remediation of chlorophenol-contaminated groundwater in Kärkölä

In 1976, Koskisen’s sawmill was destroyed in a fire. As a result of the fire, some of the chlorophenol-based anti-bluing agent used for preserving sawn timber (KY-5) was released into the soil and groundwater through fire-fighting water runoff. At the time, nobody could have predicted that local groundwater would become contaminated. In 1987, chlorophenols were detected at the municipality of Kärkölä’s Kukonmäki pumping station, and the site’s groundwater was found to be contaminated. Starting from 1988, Koskisen, the Finnish authorities and various research institutions started to explore different remediation options. However, they were unable to develop a sufficiently effective remediation method at this point. In 2008, the Supreme Administrative Court ordered Koskisen to create a groundwater remediation and monitoring plan. The order to start the actual remediation process never came.

However, being a responsible company, Koskisen decided to initiate the process as soon as a sufficiently effective remediation method became available. Remediation began on 25 June 2012, with advisory support from Pöyry Oy. The selected remediation method is based on the combined action of microbes and oxygen. This marked the first time this method was used in Finland for groundwater remediation. The method proved to be highly successful. To speed up the remediation process, Koskisen had an additional extraction well built for pumping out contaminated water. The well was commissioned on 21 April 2016, and remained in continuous operation until 20 April 2017, at which point pumping operations were mainly discontinued. Approximately 75 percent of the groundwater in the contaminated area has been cleaned up, and in certain key areas, the figure is 94 percent. Changes in the chlorophenol content of the area’s groundwater are still subject to regular monitoring. Currently, groundwater samples are collected annually from 19 different groundwater pipes and wells. Groundwater levels are measured from 20 different groundwater pipes and wells three times a year. Furthermore, remediation efforts are still ongoing: Koskisen continues peroxide-based oxidation in one of its groundwater pipes and will continue to monitor its effects. The authority supervising the remediation project is the Tavastia centre for economic development, transport and the environment.


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