Drinking water is of high quality in Asker Municipality, and you can safely drink tap water. The distribution of water is managed by Asker and Bærum Waterworks, while treatment is the responsibility of Vestfjorden Sewage Company. The watering of gardens is restricted throughout the year, as follows: addresses with an odd number may water on odd dates, addresses with an even number may water on even dates.
Asker has a rich biological diversity due to its varied inland topography and extensive coastline. The municipality is home to over 100 species listed as "rare" on a regional or national basis.