A small amount of oxygen, up to about ten molecules of oxygen per million of water, is actually dissolved in water. Another common measurement often taken is dissolved oxygen (DO), which is a measure of how much oxygen is dissolved in the water - DO can tell us a lot about water quality.Īlthough water molecules contain an oxygen atom, this oxygen is not what is needed by aquatic organisms living in natural waters. Some measurements, such as temperature, pH, and specific conductance are taken almost every time water is sampled and investigated, no matter where in the U.S. The USGS has been measuring water for decades. USGS scientist is measuring various water-quality conditions in Holes Creek at Huffman Park in Kettering, Ohio.
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