National USEPA Clean Watershed Needs Survey WWTP nutrient load data 1978 to 2012
Dates
Publication Date
2017-09-25
Start Date
1978
End Date
2012
Citation
Ivahnenko, T.I., 2017, National USEPA Clean Watershed Needs Survey WWTP nutrient load data 1978 to 2012: U.S. Geological Survey data release, https://doi.org/10.5066/F7MG7MNN.
Summary
This dataset contains tabular data for U.S. Environmental Protection Agency’s (EPA) Clean Watersheds Needs Survey (CWNS) wastewater treatment facility information. Literature-based average total nitrogen and total phosphorous concentrations were substituted for wastewater treatment levels reported for each facility because little or no concentration data is reported in the CWNS. Concentrations were based on the treatment levels of raw, primary, secondary, and advanced. Concentration and effluent flow-value data gaps were ‘filled in’ through simple linear assumptions, based on each facility’s responses to the survey in years bracketing the data gap or were based on an un-bracketed single year survey response. Unlike the McMahon and [...]
Summary
This dataset contains tabular data for U.S. Environmental Protection Agency’s (EPA) Clean Watersheds Needs Survey (CWNS) wastewater treatment facility information. Literature-based average total nitrogen and total phosphorous concentrations were substituted for wastewater treatment levels reported for each facility because little or no concentration data is reported in the CWNS. Concentrations were based on the treatment levels of raw, primary, secondary, and advanced. Concentration and effluent flow-value data gaps were ‘filled in’ through simple linear assumptions, based on each facility’s responses to the survey in years bracketing the data gap or were based on an un-bracketed single year survey response. Unlike the McMahon and others (2007) method used to complete the EPA Permit Compliance System/Integrated Compliance Information System (PCS/ICIS) dataset where data from similar facilities was used to fill the data gaps, treatment level and flow data unique to each facility were used to complete the Clean Watershed Needs Survey dataset. The Clean Watershed Needs Survey data were collected by the EPA for the years 1978, 1980, 1982, 1984, 1986, 1988, 1990, 1992, 1996, 2000, 2004, 2008 and 2012, and total nitrogen and total phosphorous loads were calculated using reported annual flows and nutrient concentration values substituted from literature for reported treatment levels from the CWNS. The long-term nutrient loads are provided as supportive information for studies being conducted by the USGS National Water Quality Assessment (NAWQA) Project.
McMahon, Gerard, Tervelt, Larinda, and Donehoo, William, 2007, Methods for estimating annual wastewater nutrient loads in the southeastern United States: U.S. Geological Survey Open-File Report 2007-1040, 81 p., https://pubs.usgs.gov/of/2007/1040/.
Click on title to download individual files attached to this item.
CWNSLoads09212017.csv
26.14 MB
text/csv
FCCWNSMetadata3.xml Original FGDC Metadata
View
23.9 KB
application/fgdc+xml
Related External Resources
Type: Related Primary Publication
Ivahnenko, Tamara, 2017, Evaluation and use of U.S. Environmental Protection Agency Clean Watersheds Needs Survey data to quantify nutrient loads to surface water, 1978–2012: U.S. Geological Survey Scientific Investigations Report 2017–5115, 11 p., https://doi.org/10.3133/sir20175115.
The Clean Watershed Needs Survey data were collected for the years 1978, 1980, 1982, 1984, 1986, 1988, 1990, 1992, 1996, 2000, 2004, 2008 and 2012, and total nitrogen and total phosphorous loads were calculated based on reported annual flows and nutrient concentration values derived from treatment levels from the Survey. The long-term nutrient loads are provided as supportive information for studies being conducted by the U.S. Geological Survey.
