The calculator is to assist local authorities in building sampling programmes that cover all appropriate parameters at the correct frequency.
To use the calculator, you need to know the supply type, for example a regulation 9 supply, and the supply size in cubic metres. The calculator will then work out which parameters must be tested and at what frequency. There is an option to add any other parameter that may need to be tested because of the outcomes of the supply risk assessment. Combined, this will provide you with the expected number of tests required per year in a spreadsheet to download. It is then down to you to determine how to schedule these into a sensible number of supply visits per year.