Waterways Now Less Crammed With Pesticides
Risk to humans drops, but aquatic life still in danger, especially in city waters
By Jenn Gidman,  Newser Staff
Posted Sep 12, 2014 8:51 AM CDT
In this June 8, 2009, photo provided by the US Geological Survey, USGS California Water Science Center research hydrologist Kelly Smalling collects water samples for pesticide analysis.   (AP Photo/US Geological Survey)

(Newser) – Carbon dioxide levels may be spiking, but there's one environmental irritant that looks to be partially on the decline: pesticides in our nation's waterways. More stringent regulations and the creation of more Earth-friendly products get some of the credit for this backslide, reports the New York Times, citing a study conducted by the US Geological Survey from 1992 to 2011 and published in the journal Environmental Science & Technology. Only one stream surpassed a pesticide benchmark for humans in the second decade of the study, down from 17% of agricultural streams from 1992 to 2001. But while the risk to humans has subsided, aquatic life doesn't get off quite so easy, notes the Times.

Up to 61% of agricultural streams and 46% of "mixed-land-use" streams still harbor pesticide levels that surpass acceptable levels for aquatic life; those numbers remained fairly stable over 20 years. City waterways fared the worst over the study's term: Streams that exceeded the aquatic-life benchmark jumped from 53% in the first 10 years to 90% in the second 10; scientists place much of the blame on a roach and flea killer, as well as a common household insecticide. Even worse news for aquatic creatures is that the study might not be showing how bad it really is, notes the Times: Because of financial restrictions or insufficient resources, researchers couldn't test for some other commonly used pesticides. (Read about how a pesticide actually saved Darwin's finches.)
 

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