........ PPM is the permissible limit of BOD of any waste water body to be disposed off in any fresh water body.
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A BOD level of 1-2 ppm is considered very good. ... In water 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. At BOD levels of 100 ppm or greater, the water supply is considered very polluted with organic waste.
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BOD is measured by incubating the water sample at 200 C which is to simulate the organic degradation in nature. The purest form of river water is expected to have BOD levels below 1 mg/L. A water body polluted to an average level has a BOD between 2 to 8 mg/L and highly polluted water body will exceed BOD of 8 mg/L.
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