Regulation 3 Sampling and analysis

Samples must be taken in relation to the waters at a frequency sufficient to show any changes in the aquatic environment, having regard in particular, to natural variations in hydrological conditions.

Where a discharge containing any substance listed in column (1) of the Schedule is made to the waters, samples must be taken at a point sufficiently close to the discharge point to be representative of the quality of the aquatic environment in the area affected by the discharge.

Samples taken in relation to the waters shall be analysed using the relevant reference methods of measurement specified in column (3) of the Schedule or other methods which have limits of detection, precision and accuracy at least as good.