Notes: The maximum permitted level of radon in drinking water from waterworks is 100 Bq/L. For home and cabin owners with their own private water supply, DSA recommends remediation to be carried out if the water has a radon concentration of more than 500 Bq/L. Lead Agency: Norwegian Food Safety Authority. Website: <<https://lovdata.no/forskrift/2015-07-03-870/§4a>> (in Norwegian)