Espoo houses many kinds of waterways — streams and ditches, lakes and the sea. Most lakes are concentrated in Nuuksio highlands and central parts of the city.

In Espoo, it is possible to enjoy the purl of a brook, admire lights flickering over a lake surface, and witness the might of a stormy sea. Those looking for recreation can enjoy fishing, boating, swimming, skiing or exploring aquatic wildlife. Like in numerous other places, Espoo's growth is based on water and waterways, which have served as transport routes and sources of food, drink and power.

Water quality under regular monitoring

The City of Espoo conducts regular water quality tests in specific lakes, rivers, streams and sea areas. The tests provide information on any changes and the effects of possible restoration measures.

The lakes under monitoring include Bodominjärvi, Matalajärvi, Lippajärvi, Pitkäjärvi, Hannusjärvi, Luukinjärvi and Kalajärvi. Of flowing waters, Espoonjoki, Lambrobäcken, Glimsinjoki, Glomsinjoki, Monikonpuro, Gumbölenjoki, Mankinjoki and Finnobäcken are tested.

Natural and scattered loading caused by agriculture and non-sewered sanitation burden the water systems. Many of the monitored streams and lakes are by nature eutrophic and clay-turbid. In densely built-up areas, stormwater pollution, in particular, impairs water quality.

Seawater monitoring is mainly combined with obligatory control of the Suomenoja and Viikinmäki waste waters in Helsinki. In addition, the various operators in the Ämmässuo-Kulmakorpi area have an obligation to monitor their impact on surface water, for example. Water quality in Pitkäjärvi water catchment in Nuuksio is controlled by the Helsinki Region Environmental Services Authority (HSY).