While a rain storm may make us feel like the earth has been cleansed and renewed, a consequence of that rain is large amounts of pollutants including pesticides being washed into waterways. The list below contains a few of the problem areas.
Excess nutrients –
Bacteria and other pathogens Photo Credit https://www.tribuneindia.com/news/himachal/water-quality-in-rivers-poor-pollution-board-launches-plantation-campaign/791269.html
Trash & debris
Household hazardous wastes
According to the article in Science daily, “researchers analyzed 500 chemicals in urban stormwater collected during rainstorms. These Samples contained a median of 73 organic chemicals, with pesticides being the most frequently detected chemical group. Eleven contaminants, including the insect repellent DEET, nicotine, caffeine and bisphenol A, were found in more than 90% of samples. The researchers also frequently detected prescription and non-prescription pharmaceuticals, indicating that the stormwater was contaminated with human waste, possibly from sewage leaks or other urban sources.”
It has become evident that more and more contaminants are carried in stormwater at higher rates that initially thought.
Urban Stormwater: An Overlooked Pathway of Extensive Mixed Contaminants to Surface and Groundwaters in the United States