Recent rainfall in the United Kingdom, following an extended dry spell and drought declarations, may cause tap water to exhibit a 'musty' or 'earthy' taste and odor, according to a chemist. Dr. Bill Simpson, a chemist at Our Taap, stated that heavy rains can introduce additional organic matter and pollutants into natural water sources as runoff. This increased organic content can lead to the formation of disinfection byproducts, such as trihalomethanes, when water is treated with chlorine.
These byproducts, which can give water 'inky,' 'plastic,' or 'musty' notes, are difficult to remove entirely during the treatment process. Consequently, traces of these taste and odor compounds may persist, affecting the sensory quality of tap water for consumers. Dr. Simpson reassured the public that despite these potential taste alterations, the tap water remains safe to drink.
The UK experienced a significant dry period, leading to drought conditions across much of England. The recent arrival of frequent showers, while providing needed relief, also presents challenges for water treatment facilities. Higher levels of chlorine may be employed during treatment to mitigate the increased presence of microorganisms, some of which can be pathogenic or antibiotic-resistant, further contributing to potential taste and odor changes.