<P> Governments have set standards on the allowable turbidity in drinking water . In the United States , systems that use conventional or direct filtration methods turbidity can not be higher than 1.0 nephelometric turbidity units ( NTU ) at the plant outlet and all samples for turbidity must be less than or equal to 0.3 NTU for at least 95 percent of the samples in any month . Systems that use filtration other than the conventional or direct filtration must follow state limits , which must include turbidity at no time exceeding 5 NTU . Many drinking water utilities strive to achieve levels as low as 0.1 NTU . The European standards for turbidity state that it must be no more than 4 NTU . The World Health Organization , establishes that the turbidity of drinking water should not be more than 5 NTU , and should ideally be below 1 NTU . </P>
<P> Governments have set standards on the allowable turbidity in drinking water . In the United States , systems that use conventional or direct filtration methods turbidity can not be higher than 1.0 nephelometric turbidity units ( NTU ) at the plant outlet and all samples for turbidity must be less than or equal to 0.3 NTU for at least 95 percent of the samples in any month . Systems that use filtration other than the conventional or direct filtration must follow state limits , which must include turbidity at no time exceeding 5 NTU . Many drinking water utilities strive to achieve levels as low as 0.1 NTU . The European standards for turbidity state that it must be no more than 4 NTU . The World Health Organization , establishes that the turbidity of drinking water should not be more than 5 NTU , and should ideally be below 1 NTU . </P>
what is the acceptable level of turbidity in drinking water
what is the acceptable level of turbidity in drinking water
should not be more than 5 NTU
should not be more than 5 NTU