Question to the Department for Environment, Food and Rural Affairs:

To ask Her Majesty’s Government what assessment they have made of the levels of pollution in (1) drinking water, (2) river water, and (3) coastal waters, caused by chemicals used in medications which are resistant to present purification techniques

The Drinking Water Inspectorate (DWI) published research in 2012 to assess the levels of pollution caused by a range of pharmaceuticals and illicit drugs found in source waters, such as rivers, abstracted for drinking water and the comparative levels after water treatment. Over a year, substances were measured at four sites. Results agreed with similar studies and concentrations in English surface waters are generally low and below 1 microgramme per litre (1 μg/L). Levels of pharmaceuticals and drugs in drinking waters after treatment were generally significantly lower than those found in surface waters. This indicates that the drinking water treatment systems used in England and Wales are effective at removing these contaminants. The study concluded that the presence of low levels of pharmaceuticals and illicit drugs in drinking waters in England and Wales do not pose an appreciable risk to human health.

There is evidence that widely used pharmaceuticals are detected at low concentrations in sewage effluent and receiving surface waters. Due to a lack of good quality toxicity data for many of these substances to assess reliably risks to aquatic wildlife that may be exposed to them, research is underway in the UK, at European level and by the pharmaceutical industry to characterise the risks better. This includes a Chemical Investigations Programme, undertaken by England’s water companies, where significant investment is being made to investigate around 20 substances from 2015-2017. Reported data will improve our understanding of the contamination of surface waters due to these chemicals and information will contribute to assessment of the risk posed to, or via the aquatic environment.

In addition, the UK is participating in a European monitoring network of surface water sites on a ‘watch list’ of contaminants and pharmaceuticals, including the active ingredient of the contraceptive pill, EE2. The Devolved Administrations are doing something similar. Data will inform the Commission’s selection of future priority substances requiring control, and the chemical status of the EU’s surface waters with respect to these chemicals.