Rainwater has long been regarded as exceptionally pure among natural waters, yet it is not advisable to drink it, particularly in large urban areas like Moscow. This perspective comes from a chemist and former member of the meteorology and climatology department at Moscow State University’s Geography Faculty. The expert emphasized that while rainwater shares the same chemical components as other natural waters, their concentrations are typically much lower. This distinction matters because purity in composition does not automatically translate to safety for consumption in modern environments.
In the past, people collected rainwater for drinking because it was perceived as soft and salt content was minimal. Yet those historical practices do not account for today’s pollution levels. Modern rain can pick up contaminants from atmospheric emissions and urban activities, changing its safety profile significantly. The same gentle rain that was once thought to be harmless can now carry substances that pose health risks when ingested.
Current conditions in many cities include a broad spectrum of pollutants. Emissions from industrial processes and heavy traffic contribute a variety of substances that can end up dissolved in rainwater. Among these are dust and soot, which may carry toxic metals in trace amounts, and a range of chemicals that can be harmful in even microgram quantities. Although rainwater often remains among the cleanest natural waters, this does not guarantee it is safe to drink without proper treatment.
Experts note that the presence of nitrates and other contaminants can be traced back to human activity and vehicle exhaust. The accumulation of such substances in rainwater is not uncommon in densely populated areas, and the combined effect of multiple pollutants can raise health concerns when consumed directly. This reality underscores the need for caution and appropriate water treatment whenever rainwater is considered for use as drinking water.
Thus, despite its natural origins and historically perceived purity, rainwater should be treated as potentially unsafe to drink without verification and proper filtration. The consensus among educated scientists in the field remains that drinking rainwater in modern urban environments is not recommended, and a reliable supply of treated water should be preferred for daily consumption. This stance reflects a broader understanding of how modern pollution affects even the most seemingly pristine water sources.
Ultimately, the myth of universally drinkable rainwater has been challenged by decades of research and practical observations. While rainfall continues to be a valuable resource for replenishing supplies and supporting ecosystems, direct consumption without filtration and testing is discouraged. Public health guidance consistently emphasizes the importance of ensuring water safety through established treatment processes before it reaches drinking standards. The prevailing view is that responsible water use entails recognizing the potential risks and choosing safer alternatives when possible.