What is the BOD of pure water?
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The BOD of pure water is 1ppm and if it is greater than 17ppm then it is polluted water.
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A water supply with a BOD level of 3-5 ppm is considered moderately clean. Inwater with a BOD level of 6-9 ppm, the water is considered somewhat polluted because there is usually organic matter present and bacteria are decomposing this waste.
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