Contact us
Helsinki Region Environmental Services Authority
Exchange: +358 9 15611 (available 8:30 am to 4 pm)
Fax: +358 9 1561 2011
Postal address: P.O. Box 100, FI-00066 HSY
Street address: Opastinsilta 6 A, 00520 Helsinki
HSY Registry Office (available 8:30 am to 3:30 pm):
tel. +358 9 1561 2010
kirjaamo(at)hsy.fi or hsy(at)hsy.fi
Invoicing
Helsinki Region Environmental Services Authority
P.O. Box 303
FI-00066 HSY
eInvoice address: EDI = 0037227424191
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