Emerging Contaminants

Featured Study: Pharmaceuticals in Groundwater

Featured Study: Pharmaceuticals in Groundwater

There are few pharmaceuticals and hormones in groundwater used for drinking, finds a new USGS study. Groundwater in areas with fractured rocks most vulnerable to pharmaceutical contamination.

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Featured Study: Chemical Mixtures in Small U.S. Streams

Featured Study: Chemical Mixtures in Small U.S. Streams

Mixtures of organic chemicals are ubiquitous in small U.S. streams, reports a new study by the U.S. Geological Survey. In many streams the mixtures could be affecting stream organisms.

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Emerging contaminants, or contaminants of emerging concern, can refer to many different kinds of chemicals, including medicines, personal care or household cleaning products, lawn care and agricultural products, among others. These chemicals make it into our Nation's lakes and rivers and have a detrimental affect on fish and other aquatic species. That have also been shown to bioaccumulate up the food web - putting even non-aquatic species at risk when they eat contaminated fish. The USGS monitors and assesses these dangerous chemicals from their source all the way through the food web.


Since the 1990s studies around the country have investigated how a wide range of chemical compounds, industrial pollutants, and human by-products have been making it into our Nation's waterways. Traditionally, most people were not overly concerned about this because the old mantra used to be "dilution is the solution to pollution" However, this is far from true. After the contaminants make it into the rivers and streams, tests show that there are measurable quantities of these contaminants within the water, itself, as well as in the under-water sediments, the nearby aquatic insects, migratory fish that eat the insects, and even predatory wildlife that consume all these different organisms.



A scientist working in a laboratory

USGS scientist measuring pharmaceutical concentrations in samples collected from the Rivers Foss and Ouse, United Kingdom (Credit: Stephen L. Werner)

Contaminants of emerging concern enter the environment every day. To understand where these chemicals come from, we just need to think about our modern lifestyle. People use chemical-based products each day. These chemicals remain in wastewater and beyond because treatment plants weren't designed to take out these chemicals. Similarly, industrial processes that have their own treatment processes don’t remove all these chemicals, either. Eventually, they end up in the Nation’s lakes and rivers. So these chemicals are getting into the environment and we're concerned about the effects they might be having on organisms, including humans. After all, different contaminants have been detected in drinking water supplies and their risk to our health is still uncertain.



USGS studies contaminants and pathogens in nature and provides the science necessary to help protect the health of people and the environment.



U.S. Environmental Protection Agency