Stormwater sewerage fees

​A connection fee and basic rate for stormwater sewerage is applied by HSY. The basic rate for stormwater sewerage is invoiced from all properties located in the stormwater sewerage area. The connection fee is invoiced from the property when it joins the stormwater sewer network. The connection fee and basic rate are determined on the basis of the property’s floor area and purpose of use.

We cover the maintenance and construction costs of the stormwater sewerage system with the storm water fee. For example, the construction of stormwater sewerage systems and their maintenance and servicing cause costs.

Basis for the payment of the basic rate for stormwater

We charge a basic rate for stormwater for all the properties located in the stormwater sewerage area because the sewerage system serves all the properties in the area. Therefore, we also charge the basic rate for stormwater from properties in the stormwater sewerage area which have not joined the stormwater sewerage system.

The charge also applies to properties exempted from joining the stormwater sewer network. For instance, during heavy rain, stormwater may be released from the property to the stormwater sewer network although, at other times, the property would absorb its stormwater or convey it to an open trench, for example.

The basic rate for stormwater is included in the water invoice. Learn more about how to read the water invoice at hsy.fi/invoice.

Stormwater sewerage area

Areas provided with HSY’s stormwater sewers are included in the stormwater sewerage area. We have checked the stormwater sewerage area and the verified area entered into force in the beginning of 2019.

The checking involved determining which properties are located in the stormwater sewerage area. The verified stormwater sewerage area includes approximately 63,000 properties. Around 8,000 properties were added and some 2,500 properties were removed from the area. For about 50,000 properties, there were no changes.

We will update the basis for payment for properties added into the stormwater sewerage area in connection with the reform of our invoicing in March 2020. For example for a detached house with a floor area of 175 m2, the basic rate for stormwater is approximately EUR 26 per year. We will not charge the basic rates for stormwater retrospectively from the beginning of 2019.

The changes involving the basic rate for stormwater being identified as an item separate from the basic rates for water and wastewater, and the changes in the basis for payment of the basic rate for stormwater are based on the amendment of the Water Services Act (Water Services Act 119/2001 and amendment 681/2014).

Stormwater sewerage areas on the map

You can use the map below to check whether your property is located in the stormwater sewerage area. The map shows the following areas:

Blue = Stormwater sewerage area
Grey = Combined sewerage area
Brown = Areas to which stormwater sewerage will be extended

If your property is located in one of these three areas, we will charge the basic rate for stormwater from you. In addition, we will charge the basic rate for stormwater if your property is connected to a stormwater sewer. The basic rate for stormwater will also apply to you if you have a stormwater connection and your property is situated outside the stormwater sewerage area.

Use the HSY map service to check the location of your property in the stormwater sewerage area based on the property’s address. Open the link below, enter the address of your property in the Search field in the left upper corner and click Enter. The map will automatically show your property.

Link to the HSY map service