Note 1:,
(a) Member States may set a level for radon which is judged inappropriate to be exceeded and below which optimisation of protection should be continued, without compromising water supply on a national or regional scale. The level set by a Member State may be higher than 100 Bq/l but lower than 1 000 Bq/l. In order to simplify national legislation, Member States may choose to adjust the parametric value to this level.,
(b) Remedial action is deemed to be justified on radiological protection grounds, without further consideration, where radon concentrations exceed 1 000 Bq/l.,
Note 2: Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other artificial radionuclides shall be required.,

Radon,100,Bq/l,(Note 1),
Tritium,100,Bq/l,(Note 2),
ID,0,1,mSv,,
Note 1: A supply zone is a geographically defined area within which water intended for human consumption comes from one or more sources and within which water quality may be considered as being approximately uniform.,
Note 2: The volumes are calculated as averages taken over a calendar year. A Member State may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita.,
Note 3: As far as possible, the number of samples should be distributed equally in time and location.,
Note 4: In the event of intermittent short-term supply the monitoring frequency of water distributed by tankers is to be decided by the Member State concerned.,
Note 5: The frequency is to be decided by the Member State concerned.,
  Member States shall define sampling frequencies for water intended for human consumption put into bottles or containers intended for sale. In so doing Member States may take into consideration the volume of water produced.  ,

volume ≤ 100,(Note 5),
100 < volume ≤ 1 000,1,
1 000 < volume ≤ 10 000,  1    + 1 for each 3 300 m 3 /d and part thereof of the total volume  ,
10 000 < volume ≤ 100 000,  3    + 1 for each 10 000 m 3 /d and part thereof of the total volume  ,
volume > 100 000,  10    + 1 for each 25 000 m 3 /d and part thereof of the total volume  ,
    This table includes values for the most common natural and artificial radionuclides; these are precise values, calculated for a dose of 0,1 mSv, an annual intake of 730 litre and using the dose coefficients laid down in Annex III, Table A of Directive 96/29/Euratom; derived concentrations for other radionuclides can be calculated on the same basis, and values can be updated on the basis of more recent information recognised by the competent authorities in the Member State.    ,
    This table allows only for the radiological properties of uranium, not for its chemical toxicity.    ,

Natural,U-238 ,3,0 Bq/l,
U-234 ,2,8 Bq/l,
Ra-226,0,5 Bq/l,
Ra-228,0,2 Bq/l,
Pb-210,0,2 Bq/l,
Po-210,0,1 Bq/l,
Artificial,C-14,240 Bq/l,
Sr-90,4,9 Bq/l,
Pu-239/Pu-240,0,6 Bq/l,
Am-241,0,7 Bq/l,
Co-60,40 Bq/l,
Cs-134,7,2 Bq/l,
Cs-137,11 Bq/l,
I-131,6,2 Bq/l,
Note 1: The limit of detection shall be calculated according to the ISO standard 11929: Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionising radiation — Fundamentals and application, with probabilities of errors of 1st and 2nd kind of 0,05 each.,
Note 2: Measurement uncertainties shall be calculated and reported as complete standard uncertainties, or as expanded standard uncertainties with an expansion factor of 1,96, according to the ISO Guide for the Expression of Uncertainty in Measurement.,
Note 3: The limit of detection for tritium and for radon is 10 % of its parametric value of 100 Bq/l.,
Note 4: The limit of detection for gross alpha activity and gross beta activities are 40 % of the screening values of 0,1 and 1,0 Bq/l respectively.,
Note 5: This limit of detection applies only to initial screening for ID for a new water source; if initial checking indicates that it is not plausible that Ra-228 exceeds 20 % of the derived concentration, the limit of detection may be increased to 0,08 Bq/l for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required.,

Tritium,10 Bq/l,Note 3,
Radon,10 Bq/l,Note 3,
gross alpha activity,0,04 Bq/l,Note 4,
gross beta activity,0,4 Bq/l,Note 4,
U-238,0,02 Bq/l,,
U-234,0,02 Bq/l,,
Ra-226,0,04 Bq/l,,
Ra-228,0,02 Bq/l,Note 5,
Pb-210,0,02 Bq/l,,
Po-210,0,01 Bq/l,,
C-14,20 Bq/l,,
Sr-90,0,4 Bq/l,,
Pu-239/Pu-240,0,04 Bq/l,,
Am-241,0,06 Bq/l,,
Co-60,0,5 Bq/l,,
Cs-134,0,5 Bq/l,,
Cs-137,0,5 Bq/l,,
I-131,0,5 Bq/l,,