Northeast Ohio River Project

National Sanitation Foundation
Water Quality (Eutrophication) Index


The Water Quality Index of the National Sanitation Foundation is standard index of nine variables used to measure water quality. This index was developed in 1970 as an attempt to systemize a series of tests by which a river's water quality can be monitored for patterns and changes over time. Strictly speaking, it does not measure water quality. It measures the tendency for watercourses to contribute to eutrophication of lakes and streams. It is, thus, an index which brings together a number of factors of general interest to water pollution management. But it makes sense to look at some other chemical variables as well. Some of the most useful are included here.

TESTS INCLUDED IN THE WATER QUALITY INDEX:



OTHER CHEMICAL TESTS OF INTEREST WHICH ARE NOT INCLUDED IN THE WATER QUALITY INDEX:





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