Lahti Aqua Introduction  

Company 

Lahti Aqua Ltd has long traditions in water services. The company has been operating for a century in the year 2010. Lahti Aqua is owned by the city of Lahti and situated in the harbour.

Lahti Aqua produces drinking water and wastewater services for the cities Lahti and Hollola. We employ nearly 90 people and have a turnover of 25,7 million Euros.

Lahti Aqua Concern is divided into three parts. Lahti Aqua Ltd is the parent company for subsidiaries Aqua Service Ltd and Aqua Network Ltd. Lahti Aqua takes care of administration, customer service and management of the water services on the whole. Aqua Service is responsible for clean water supply and wastewater treatment. It also manages the maintenance of the distribution network and processing facilities. Aqua Network owns the facilities and distribution network.

We are proud to provide our customers with reliable, high quality services and do it sustainably in respect of the environment.

Clean water     

Lahti Aqua provides clean water for 120 000 customers in Lahti and Hollola. Almost 8 Mm³ of water is pumped daily for domestic and industrial use.

We use groundwater, which is famous for its good quality. Our company makes sure this valuable asset gets the treatment it deserves. Formed in the ridges of Salpausselkä, the groundwater would be drinkable as such. It doesn’t need any purification, but to prevent the growth of bacteria in the distribution network, the water is disinfected with sodium hypochlorite and UV-treatment.

Most of the groundwater resources are located underneath residential and industrial areas. Therefore it is vital for us to be active in protecting these resources.

Wastewater

There are two wastewater treatment plants in Lahti which process an average of 40 000 m³ of municipal and industrial wastewater each day. Wastewater is treated mechanically, biologically and chemically to meet the high standards set by environmental authorities. Organic matter and nitrogen are removed by biological treatment and phosphorus is chemically precipitated. Nitrogen and phosphorus are the main nutrients causing eutrophication of lakes and seas. The treated effluent is discharged into the river Porvoonjoki. The condition of the river is carefully monitored.