Schedule 22, paragraph 3(3)

The regulator may determine that a discharge, or an activity that might lead to a discharge, is not a groundwater activity if the input of the pollutant— is the consequence of an accident or exceptional circumstances of natural cause that could not reasonably have been foreseen, avoided or mitigated, is or would be of a quantity and concentration so small as to obviate any present or future danger of deterioration in the quality of the receiving groundwater, or is or would be incapable, for technical reasons, of being prevented or limited without using— measures that would increase risks to human health or to the quality of the environment as a whole, or disproportionately costly measures to remove quantities of pollutants from, or otherwise control their percolation in, contaminated ground or subsoil.

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Source: legislation.gov.uk · retrieved 2026-07-30