# The Private Water Supplies (Wales) Regulations 2017, Paragraph 14

Extent: E+W

Where the following formula is satisfied, it can be assumed that the indicative dose is less than the parametric value of 0,1 mSv and no further investigation is required—
Derived concentrations for radioactivity in water intended for human consumption
Origin
Nuclide
Derived concentration
(1)This table allows only for the radiological properties of uranium, not for its chemical toxicity.
Natural
U-2383
3,0 Bq/l
U-2343
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
1-131
6,2 Bq/l

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Source: https://www.legislation.gov.uk/wsi/2017/1041/schedule/4/paragraph/14 (the official version)
Page: https://openlegislation.uk/private-water-supplies-wales-regulations-2017/schedule-4/paragraph-14
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.