Our story

Let us take care of fresh water for you

As Estonia's largest water utility, our job is more than just treating water – we also create and maintain the modern urban infrastructure that promotes safe living in and around Tallinn.

We borrow water from nature, treat it into the best drinking water, and deliver it to people. After it has been used, we collect the water again and return it to nature as clean. We do this 24 hours a day, 365 days a year, with no breaks, for nearly half a million people and thousands of businesses.

For this, we have two treatment plants. From the Ülemiste Water Treatment Plant, about 70,000 cubic metres of drinking water is pumped into the water distribution network every day, which is about 77 times more than the recommended per capita volume in our service area. In addition, we treat 143,000 cubic metres of wastewater every day at the Paljassaare Wastewater Treatment Plant.

The Tallinna Vesi Group is composed of the parent company AS Tallinna Vesi and the subsidiary Watercom OÜ. Tallinn Vesi also has accredited water and wastewater laboratories.

The shares of Tallinna Vesi are listed on the Nasdaq Baltic Main List. As of 31 December 2025, OÜ Utilitas and the City of Tallinn were the shareholders who had acquired a direct holding of more than 5% of the shares.

History

2025

Following a test period, the Paljassaare combined heat and power plant began operating at full capacity. The plant produces all the heat and half of the electricity required by the wastewater treatment plant using the biogas generated during the wastewater treatment process.

2022

We signed a new administrative contract with the city, covering the period from 01/12/2022 to 30/01/2032. Along with the approval of the administrative duty, Tallinna Vesi was appointed as the water undertaker within the main public water supply and sewerage service area in Tallinn at least until 30 November 2032 (incl.). This means that we will be responsible for providing clean water in Tallinn.

2021

The City of Tallinn and Utilitas bought out Unitied Utilities' stake in Tallinna Vesi.

2010

We formed a subsidiary, Watercom, which provides services to the parent company and is focused on expanding the range of services and developing non-regulated services. The subsidiary Watercom is wholly owned by AS Tallinna Vesi and its results are consolidated in the Group results.

2005

Tallinna Vesi became listed! As of 1 June 2005, the shares of Tallinna Vesi are listed on the Tallinn Stock Exchange's main list.

2001

Tallinna Vesi was privatised and became owned by the City of Tallinn and the United Kingdom’s water company United Utilities.

1997

We started using ozonation instead of pre-chlorination in the treatment of water, which meant that the strong smell and taste of chlorine in drinking water became a thing of the past.

1995

We introduced chemical and biological treatment at the Paljassaare Wastewater Treatment Plant in order to remove all pollutants from the wastewater. With the addition of these treatment steps, sludge started to form and a few years later sludge treatment was started.

1981

The Paljassaare Wastewater Treatment Plant, which had mechanical treatment facilities, began operating. This is the stage of water treatment where all the insoluble particles in the water are removed.

1978

On 18 January, the main pumping station, which is the upstream part of the wastewater treatment plant, was started up for the first time. This year also saw the completion of the deep-sea outlet pipes, which are used to pump the thoroughly treated effluent nearly three kilometres into Tallinn Bay.

1927

On 29 November, Tallinn's first water treatment plant began operating. It was located on the shore of Lake Ülemiste. The oldest part of the Tallinn Filter Waterworks’ water treatment plant was designed by Erich Jacoby. It was the first building in Estonia to be constructed in the functionalist style and is considered one of the most significant achievements in 1920s industrial architecture.

1880s

The beginning of modern water supply in Tallinn, when the city started to extend the water mains. Before that, only the lower part of the Old Town was supplied with water through pipes. At the same time, in the second half of the 19th century, the construction of the street sewerage system began, turning the Härjapea River into an open sewer collector.

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