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A U.S. News examination of EPA data and state reports on thousands of rivers from 1984 to 1998 finds that the percentage of rivers designated as "impaired" has grown from 26 percent in 1986 to 36 percent in the most recent reports. The article looks at several pollutants affecting the water quality of rivers including: farm runoff, city sewage system, industry, mining, construction and urban and suburban runoff.
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