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
02770 Espoo / P.O. Box 350, 00066 HSY
00520 Helsinki / P.O. Box 301, 00066 HSY^
01360 Vantaa / P.O. Box 370, 00066 HSY
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 Lautamiehentie 1). 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
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
Asemapäällikönkatu 7, 00520 Helsinki / P.O. Box 301, 00066 HSY
Hosantie 5, 01360 Vantaa / P.O. Box 370, 00066 HSY