Renovation at Mechelininkatu and Porkkalankatu in 2018-2019

We will renovate the water-supply network and increase the capacity of the water mains supply network in Ruoholahti. We are working on Eerikinkatu, Köydenpunojankatu, Mechelininkatu, and Porkkalankatu. Construction work began in March 2018 and will be completed in August 2019. The contractor is Pohjola Rakennus Oy Infra.

Construction work will affect both traffic and the water supply.

We will inform about the traffic arrangements for the stage-by-stage processing construction separately

The construction work is due to the growth and development of Lauttasaari and Jätkäsaari. The water-supply network must meet the new demand.

In compact urban areas, we must put the pipes mainly under driveways. The installation depth for water pipes and sewers is about 2–3 meters. Safe execution of excavations requires the closing of driveways and reducing driving speeds.

Construction work has been divided into seven different phases (see the map at the end of the text). The working phases of the most critical areas of our service are scheduled for the summer season when there is less traffic. We will give you more detailed information on the timetables and the impact that the various construction phases will have on traffic on the Helsinki City Temporary Traffic Arrangements site (only in Finnish). 

Do you want to receive a text message about water-supply cuts?

Due to the construction of the water-supply network, the area will have some brief local water-supply cuts. However, the renovation work will reduce the risk of water-supply cuts due to pipe breakage in the future.

We will inform the properties in question about the planned water cuts. We also have a text-message system for communicating pre-planned water cuts. If you have a normal phone subscription that can be found from a number inquiry, for example, you will receive a text message to your mobile or an automatic call to your landline. If your subscription is registered to another address (e.g. Business Phone), you have banned your operator from giving out your address, or your subscription is secret or prepaid, the message will unfortunately not reach you.

Add your number and update your address information to our SMS system » (Only in Finnish and Swedish)

A lot of co-operation is involved in this project

We will renovate the area's water pipes and sewers to improve the condition of the water-supply network. The water connections in the area are mainly from the 1930s. The picture shows the Eerikinkatu water pipe built in 1929, we are currently renovating it. Mineral deposits have accumulated on the inner surface of the pipe, which, in particular when the water flow changes direction, causes water-quality problems (brownish water). Also, the coagulate is otherwise harmful to the operation of the network. New pipes are made from more advanced ductile cast iron.

In addition to the renovation work, we will separate the combined sewer network on Mechelininkatu and Eerikinkatu. We will build separate wastewater and storm-water sewers for future use.
At the design stage of the project we have mapped out the interest of different agents to work together, so that the streets need not be excavated immediately for another maintenance project. In addition to water supply, the project will also build a district heating network (Helen Oy), a power grid (Helen Sähköverkko Oy), and a telecommunications network (DNA Oy) in certain sections.

We will also work with the City of Helsinki. The work schedule has been drawn up so that work at Mechelininkatu will conclude at the same time as the city's work at the end of 2018.

For more information, please contact:
Supervisor  Johannes Väänänen, 050 433 5166, johannes.vaananen@hsy.fi  
Head of unit  Ilpo Korhonen, 050 340 5383, ilpo.korhonen@hsy.fi


Construction of the water supply is carried out in stages. The map is marked with different colours for different work units. In an urban environment, some surprises may emerge, which cause changes to the schedule.

Preliminary timetables for different phases, changes may occur:

Eerikinkatu (marked in red):
3-7/2018: water-supply renovation and increasing the capacity of the water main, telecom operator cable duct piping, storm-water separation.

Köydenpunojankatu (marked in red):
4-7/2018: water-supply renovation and increasing the capacity of the water main, telecom operator cable duct piping, district heating renovation, power grid cable piping.

Mechelininkatu and Porkkalankatu intersection (marked in green):
5-8/2018: water-supply renovation and increasing the capacity of the water main, telecom operator cable duct piping, district heating renovation.

Mechelininkatu (marked in brown):
5-12/2018: water-supply renovation, telecom operator cable duct piping, district heating renovation, storm-water separation.

Porkkalankatu – Salmisaarenranta (marked in pink):
6-9/2018: water-supply renovation and increasing the capacity of the water main.

Porkkalankatu – from Tallberginkatu to Itämerensola (marked in turquoise):
7/2018-4/2019: water-supply renovation and increasing the capacity of the water main, telecom operator cable duct piping.

Porkkalankatu from Itämerensola to Mechelininkatu (marked in blue):
11/2018-8/2019: water-supply renovation and increasing the capacity of the water main, telecom operator cable duct piping, power grid cable piping, building the graveyard wall.