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Oslo is a city of 10 Rivers. Some are open and some are covered. See the map from Oslo Elveforum for more information on the natural water system in Oslo.

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Oslo Vann og Avløp (water and sewerage authority) is responsible for Oslo's drinking water. The annual water quality report for 2016 is available.

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Interpol Pollution Crime Forensic Investigation Manual is available in two volumes and explains how to investigate when a crime involves pollutants. 

Volume 1

Volume 2

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Norwegian Pollution Control Law

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The Environmental Crime Crisis. A Report by the United Nations Environment Programme

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