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Estimated high-frequency chloride concentrations


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Fanelli, R.M., Sekellick, A.J., and Moore, J., 2019, Discrete and high-frequency chloride (Cl) and specific conductance (SC) data sets and Cl-SC regression equations used for analysis of 93 USGS water quality monitoring stations in the eastern United States: U.S. Geological Survey data release,


This data set includes estimated chloride concentrations for the 93 USGS water quality monitoring stations located across the eastern United States. Chloride concentrations were predicted using regression equations that established the relationship between simultaneous measurements of chloride and specific conductance (SC). Site-specific models were developed and applied when data were available, and regional regression models were used where there were insufficient data available to establish a site-specific regression model. These models were applied to high-frequency SC data sets to produce high-frequency predicted chloride concentrations at 2-minute to 1-hour intervals, depending on the frequency at which SC is measured at each [...]


Point of Contact :
Rosemary M Fanelli
Originator :
Rosemary M Fanelli
Metadata Contact :
Rosemary M Fanelli
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase

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Chloride_site_information.csv 3.02 KB text/csv 142.61 MB application/zip


The purpose of this data set is to characterize the extent to which these streams exceed U.S. Environmental Protection Agency aquatic life criteria for chloride (chronic = 4-day rolling average of 230 mg/L or greater; acute = 1 hour or longer at 860 mg/L or greater), which requires high-frequency (e.g., sub-daily) data.



  • USGS Maryland, Delaware, and the District of Columbia Water Science Center



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