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National USEPA Clean Watershed Needs Survey WWTP nutrient load data 1978 to 2012


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Ivahnenko, T.I., 2017, National USEPA Clean Watershed Needs Survey WWTP nutrient load data 1978 to 2012: U.S. Geological Survey data release,


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 [...]


Point of Contact :
Tamara I Ivahnenko
Originator :
Tamara I Ivahnenko
Metadata Contact :
Tamara I Ivahnenko
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
USGS Mission Area :
Water Resources
SDC Data Owner :
Colorado Water Science Center

Attached Files

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CWNSLoads09212017.csv 26.14 MB text/csv


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.



  • USGS Colorado Water Science Center
  • USGS Data Release Products



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Input directly

Additional Information


Type Scheme Key
DOI doi:10.5066/F7MG7MNN

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