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Introduction How Rivers Run Stories Value Of A River What We Can Do
Quality of a River - Water Quality
Contaminants: Toxins (pg 5 of 8)

Pesticide persistence in the environment varies widely. DDT is still detected in North America, even though it was banned in the United States and Canada more than 30 years ago. The nation's most widely used herbicide, atrazine, is detectable in streams and rainwater. Atrazine has recently been shown to emasculate wild male frogs in research laboratories (Hayes et al., 2002).

Concern for human health from pesticide-contaminated runoff includes contamination of drinking water supplies and the accumulation of some pesticides in food, primarily in produce, mussels, and the fatty tissues of fish.

From the standpoint of stream ecology, pesticides can kill aquatic organisms (including fish) outright, cause cancers and tumors, inhibit reproduction, cause chronically poor health of stream organisms, and disrupt their endocrine systems (see Endocrine Disruptors next screen).

(Harries et al., 1996); (Colburn and Clement, 1992)

Sandra Steingraber
Hear Sandra Steingraber
Cancer and environmental contamination

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Quality
Description
Temperature
Oxygen
Alkalinity
Nutrients
Sediment
Contaminants
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