Water services customer service offices and plants

​​​​​​​​​​Water servi​​​ces customer service points are open Monday to Friday at 8.30 a.m. to 3.30 p.m.

You can reach Connection matters by phone from Monday to Friday at 8.30 a.m. to 1.00 p.m., tel. +358 (0)9 1561 2110.​

Notice. Water supply customer services have moved to Ilmala, Helsinki


We have centralized our water supply customer service points in Helsinki Pasila, Espoo Mikkelänkallio and Vantaa Hosantie to our new headquarters in Ilmalantori 1.

Water services customer service office

Address: Ilmalantori 1, 00240 Helsinki
Mailing address P.O. Box 100, 00066 HSY.

HSY's water treatment plants and waste water plants

We don't have customer service at out plants.

Pitkäkoski water treatment plant

Kuninkaantammentie 17, 00430 Helsinki

Vanhakaupunki water treatment plant

Jokiniementie 1,  00650 Helsinki

Suomenoja waste water plant

Hyljeluodontie 5, 02270 Espoo
Please note! Since 11.07.2016 driving route to the wastewater treatment plant via Hylkeenpyytäjäntie.

Viikinmäki waste water plant

Hernepellontie 24, 00710 Helsinki