Why is hudson river so dirty

Although PCB levels in fish have decreased over the past twenty years, the downward trend has leveled off.

In fact, average PCB levels in the fish of the Upper Hudson have not changed significantly in recent years. They are still high enough to trigger restrictions on eating fish and a ban on commercial fishing.

PCBs in the sediment are not safely buried. River sediment is continually redistributed across the bottom by erosion and river flows. This movement exposes PCB-contaminated sediment, making it available to the fish.

PCBs move throughout the river. A sophisticated scientific technique was used to fingerprint where the PCBs come from and where they go. It enabled us to track the movement of PCBs in the sediment of the Thompson Island Pool - the most heavily contaminated section of the river - through the water, miles south to Kingston.

The fingerprints also reveal that the five-fold increase in PCBs, as water flows through the Thompson Island Pool, comes from the sediment. Source control alone will not clean up the river. It's simple math. The additional PCBs come from the river sediment.

That's why control of the source is an important complement to EPA's cleanup plan. But without targeted dredging, PCBs in the sediment will continue to find their way into fish at unacceptable levels and for an unacceptable length of time. Letting nature take its course will not protect people and animals who eat fish from the Hudson.

It has been suggested that if no action were taken other than source control, the levels of PCBs in fish will meet the federal Food and Drug Administration FDA tolerance level of 2 ppm between and FDA standards reflect a market basket approach, which assume people eat a variety of fish from a variety of places, purchased at their local market. A PCB level of 2 ppm is not sufficient to protect people and animals who regularly eat fish from the Hudson River.

That's why we have developed a risk-based concentration of. That is also the advisory level for unrestricted consumption accepted for the Great Lakes. Note: Information about Hudson River and New York State fishing advisories can be found by calling ext.

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And it shows that oyster restoration efforts are potentially working. Cleaner waters could mean a return to commercial oysters straight from the Hudson River in the future. People once flocked to public beaches and bathed in a number of floating public baths along the Hudson River — without fear of needing a hazmat suit. During this time, New York City was widely considered the oyster capital of the world.

But pollution , along with overharvesting, resulted in a rapid decline of oyster populations.