The European Union recommends a reference level of 100 Bq/l for radon in water supplied as part of commercial or public activities. Member States are advised to consider remedial action if radon concentrations exceed this level to protect human health. For concentrations above 1000 Bq/l, remedial action is justified based on radiological protection grounds. This standard aligns with the EU directive regarding drinking water quality.
PREREQUISITESEnvironmental scientists, public health officials, water quality regulators, and anyone involved in managing radon levels in drinking water.
See also this directive, which also takes 100 Bq/l as a limit for drinking water.5. For water supplied as part of a commercial or public activity, the following action should be taken:
(a) above a concentration of 100 Bq/l, Member States should set a reference level for radon to be used for consideration whether remedial action is needed to protect human health. A level higher than 100 Bq/l may be adopted if national surveys show that this is necessary for implementing a practical radon programme. For concentrations in excess of 1000 Bq/l, remedial action is deemed to be justified on radiological protection grounds;