Help with a Reference Level of Radon in Water

[AndresPB]

Guys, I'm keep searching for a WHO standard of Radon of Water in Bq/m³ but I can't find one. Can anyone help me find some references of maximun contamination level of Radon in Water? It may be EPA, or something else too.
Thanks a lot

 

[DrClaude]

In the EU, the recommendation is as follows:

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;

See also this directive, which also takes 100 Bq/l as a limit for drinking water.