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Q: By 1999 after the Clean Water Act had been passed in 1970 the percentage of U.S. surface waters safe for fishing and swimming had increased from 36 percent to?
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By 1999 after the Clean Water Act had been passed in 1970 the percentage of US surface waters safe for fishing and swimming had increased from 36 percent to?

62 percent


By 1999 after the Clean Water Act had been passed in 1970 the percentage of U.S. surface waters safe for fishing and swimming had increased from 36 percent to .?

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