Scotland introduced wastewater monitoring for COVID-19 early in the pandemic. From May 2020, samples have been taken and analysed using qPCR. The programme has been expanded to over 100 sites accounting for around 80% of the population. Data is presented publicly via a dashboard and regular reports are produced for both the public and health professionals. Wastewater sampling offers opportunities and challenges. It offers an objective means of measuring COVID-19 prevalence and can be more practical or timely than other methods of mass testing. However, it is also a measure with substantial variability impacted by multiple environmental factors. Methods for data collection and analysis have developed significantly through the pandemic, reflecting the evolving outbreak situation and policy direction. We discuss the Scottish experience of wastewater monitoring during the COVID-19 pandemic, with a focus on analysis of WBE data. This includes our approach to flow normalisation, our experience of variability in measurements and anomalous values, and the visualisation and presentation of data to both the public and policy makers. We also discuss how wastewater data is used for informing policy and public health actions. We draw lessons from our experience and consider future directions for wastewater-based epidemiology in Scotland.