Connecting to the water an sewer networks

See instructions for connecting a new property to HSY's water and sewer networks.

If you have bought or moved into an existing property and need to transfer the water contract, see "Changes of ownership" and "Changes to invoicing information". Here you can read instructions to order transport of sludge from septic tank.

The main stages of the connection process are described in brief below. Links to all the required forms can be found at the bottom of the page under "Forms".

A short Customer Guide for the new house builder

Connection declaration

Order the connection declaration from the connection services of HSY’s Water Services. The connection declaration shows the property’s connection point to the water supply network. You need to fill in an order form for ordering the connection declaration. A normal delivery time for a connection declaration is 1 to 3 weeks. During summer, however, the delivery may take several weeks. HSY determines the connection points. You can also suggest a connection point when you order the connection declaration. Connection points for house sewers are given to manholes, when possible. If there is no manhole near the property, we will construct a manhole for the sewer connection if possible.

HSY cannot make any decisions concerning the land use encumbrances or connections to pipes owned by another property. If the connection point requires excavation work and service piping installation into a privately-owned area, or if the connection is made to the service piping of another property, you should deliver the copies of the properties’ mutual encumbrance and maintenance contracts.

You will need to attach the connection declaration to your building permit application, and it will be used by the HVAC engineer as output data material and also by architects in new construction sites.

Additional information:

vesiliitos.helsinki(at)hsy.fi,
vesiliitos.espoo(at)hsy.fi (also for Kauniainen),
vesiliitos.vantaa(at)hsy.fi

Building permit

Apply for a building permit from the building control authority of your city. When you have been granted a building permit, also deliver the water and sewer plans of the property (“KVV plans”) to the building control authority.

In Espoo and Kauniainen, deliver these plans, with a stamp from the building control authority, to the HSY customer service point in Espoo (street address Mikkelänkallio 11 or by post to address Liittymispalvelut Espoo, P.O. Box 350, 00066 HSY).

In Helsinki and Vantaa, the building control authority will deliver the stamped KVV plans to HSY.

Connection agreement

Order the connection agreement well in advance from HSY by sending an e-mail to one of the addresses below. The delivery time could be up to two weeks. The prerequisites for making the contract are that a legally binding building permit has been received and that HSY's water and sewer networks servicing the property to be connected have already been constructed or are under construction.

The signatures of all property owners are required to make the contract. The contracts are sent to be signed to the connecting party, who will then return the signed contract to HSY. After this, HSY will sign the contracts and send a copy of the contract to the other party along with an invoice for the connection fee.

Additional information: vesisopimus.helsinki(at)hsy.fi, vesisopimus.espoo(at)hsy.fi (also for Kauniainen) and vesisopimus.vantaa(at)hsy.fi.

Connection to the network

Order the connection of the property to the water and sewer network first in writing with a connection work order form. After you have delivered the written order, request a call-back from the water supply supervisor, who will agree on the time and date of the connection work with the manager of the water and sewer works.

The prerequisites for ordering connection work are

a building permit
approved KVV plans
KVV site manager approved by the building control authority
a signed connection agreement
a written order of connection work.

Prerequisites for ordering the work will be verified in connection to the call-back request.

HSY will carry out the installation of the service piping and the service piping shut-off valve to the general water main as well as the installation of a water meter and shut-off valves and a house sewer connection to the public sewers, in accordance with the delivery terms. Connection work is invoiced separately. It is not included in the connection fee.

Delivering the work order forms

Espoo and Kauniainen
Mikkelänkallio 11, 02770 Espoo / P.O. Box 350, 00066 HSY
vesityo.espoo(at)hsy.fi

Helsinki
Asemapäällikönkatu 7 00520 Helsinki / P.O. Box 301, 00066 HSY
vesityo.helsinki(at)hsy.fi

Vantaa
Hosantie 5 01360 Vantaa / P.O. Box 370, 00066 HSY
vesityo.vantaa(at)hsy.fi

Call-back requests tel. +358(0)9 15611 (Exchange) / Work orders

Excavation, filling and covering works

Take care of the necessary excavation, filling and covering works and the related permits. Carry out the agreed excavation works before the connection date. It is possible to install the water meter either during the connection work or at a later date by a separate order.

When your property has been connected to the water supply network and the water meter has been installed, invoicing based on the normal water consumption is started.

Connecting sprinkler systems to the HSY water supply network

The person wanting to connect to the network needs to order a declaration of connection points for the sprinkler connection and also fill out the form vesisammutuslaitteiston tekniset tiedot (only in Finnish), which concerns the technical specifications of the water extinguishing systems.

You can ask for more information about the water mains (such as size, location and available water pressure) from the connection services of HSY Water Services. Upon request, we can send you a network map image from the area as a PDF file. This map should not be used for any other purposes.

Espoo and Kauniainen
Mikkelänkallio 11
02770 Espoo / P.O. Box 350, 00066 HSY
vesiliitos.espoo(at)hsy.fi

Helsinki
Asemapäällikönkatu 7
00520 Helsinki / P.O. Box 301, 00066 HSY^
vesiliitos.helsinki(at)hsy.fi

Vantaa
Hosantie 5
01360 Vantaa / P.O. Box 370, 00066 HSY
vesiliitos.vantaa(at)hsy.fi

Customer service, tel. +358(0)9 1561 2110 / Connection services

Based on the capacity assessment of the network, we will make a declaration concerning the connection of the sprinkler system. We may charge the costs of the capacity assessment from the party ordering the connection. The declaration determines the discharge and water pressure available to the sprinkler system without endangering normal water supply for household use, and the possible special terms of the connection.

The quantity of supplied water and the pressure level may be smaller than those required by the sprinkler system and the system needs to be planned so that its water intake from the network never exceeds the quantity of supplied water we have defined as the maximum.

We determine the connection point of the sprinkler system’s water intake pipe (according to the customer’s plans where possible). If it is possible to connect the system to the network, we will deliver the customer a connection declaration that defines the connection point we have approved and the possible special terms for the connection.

The person connecting to the network should request approval for the sprinkler system plans from the Building Control authority and deliver the layout of the supply water pipes to HSY. The size of the connected pipe needs to be presented in the layout.

In Helsinki and Vantaa, the building control authority will deliver the plans to HSY.

In Espoo, the customer is responsible for delivering the layout plan approved by the building control services to the Espoo customer service office, address P.O. Box 350, 00066 HSY (Street address Mikkelänkallio 11). Images cannot be delivered by email.

Contract on the connection and use of a sprinkler system can be made, when we have approved the connection application, given the declaration on the connection and there is a valid building permit. The customer must order the contract from HSY.

You can order the contract by email from
vesisopimus.espoo(at)hsy.fi,
vesisopimus.helsinki(at)hsy.fi,
vesisopimus.vantaa(at)hsy.f
or by phone, tel +358(0)9 1561 1 (Exchange)

When the contract has been signed, order the connection work from HSY. Our water supply supervisors will contact you to agree on the time and date of the connection and on its practical arrangements and, if necessary, give advice in matters concerning the connection work. We will carry out the connection work to our network for the supply water pipe and possible separate sprinkler system.

When you want to order the work, first deliver the work order form to the HSY water services’ location in you municipality. After this, leave a call-back request to the water supply supervisor in order to agree on the date of the work. +358(0)9 1561 1 (Exchange)

Delivering the work order form

Espoo and Kauniainen
Mikkelänkallio 11, 02770 Espoo / P.O. Box 350, 00066 HSY
vesityo.espoo(at)hsy.fi

Helsinki
Asemapäällikönkatu 7, 00520 Helsinki / P.O. Box 301, 00066 HSY
vesityo.helsinki(at)hsy.fi

Vantaa
Hosantie 5, 01360 Vantaa / P.O. Box 370, 00066 HSY
vesityo.vantaa(at)hsy.fi

Forms

Useful links for sprinkler connections

Terms of contract
(in Finnish only)
Terms on service
(in Finnish only)
Technical details form
(in Finnish only)