National Water-Quality Assessment (NAWQA) Program
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Nutrients in streams and rivers across the Nation--1992-2001 (USGS SIR 2006-5107)
Vulnerability of Shallow Groundwater and Drinking-Water Wells to Nitrate in the United States (Environmental Science & Technology)
Factors influencing ground-water recharge in the eastern United States (Journal of Hydrology)
Water-Quality, Streamflow, and Ancillary Data for Nutrients in Streams and Rivers Across the Nation, 1992-2001 (USGS Data Series 152)
Quality of Nutrient Data from Streams and Ground Water Sampled During Water Years 1992-2001 (USGS SIR 2005-5106)
Transport and Fate of Nitrate and Pesticides: Hydrogeology and Riparian Zone Processes (Journal of Environmental Quality, vol. 34, no. 6)
Drinking-Water Nitrate and Health--Recent Findings and Research Needs (Environmental Health Perspectives, vol. 113, no. 11)
Evaluation of Unsaturated-Zone Solute-Transport Models for Studies of Agricultural Chemicals (USGS Open-File Report 2005-1196)
Nitrate in ground water: Using a model to simulate the probability of nitrate contamination of shallow ground water in the conterminous United States (USGS SIM 2881) - Hang this poster-size (32x39 inches) map on your wall!
Hydrogeologic controls on the transport and fate of nitrate in ground water beneath riparian buffer zones: results from thirteen studies across the United States (Water Science and Technology, vol. 49, no. 3)
Spatial Variability of Groundwater Recharge and its Effect on Shallow Groundwater Quality in Southern New Jersey (Vadose Zone Journal, vol. 2, no. 4)
Nutrients in shallow ground waters beneath relatively undeveloped areas in the conterminous United States (USGS WRI 02-4289)
Probability of nitrate contamination of recently recharged groundwaters in the conterminous United States (Environmental Science & Technology, vol. 36, no. 10, p. 2138-2145) This article supersedes ES&T vol. 31, no. 8; WCP vol. 39, no. 12; and FS-092-96.
Nutrient concentrations and yields in undeveloped basins of the United States (Journal of the American Water Resources Association, vol. 36, no. 4, p. 849-860)
Nutrients in ground waters of the conterminous United States, 1992-1995 (Environmental Science and Technology, volume 34, number 7, p. 1156-1165)
Estimation of nitrate contamination of an agro-ecosystem outwash aquifer using a nitrogen mass-balance budget (Journal of Environmental Quality, vol. 28, no. 6, Nov.-Dec. 1999)
Effect of stream channel size on the delivery of nitrogen to the Gulf of Mexico
Review of phosphorus control measures in the United States and their effects on water quality
A national look at nitrate contamination of groundwater. (Jan. 1998 Water Conditioning and Purification). This article has been superseded by Probability of nitrate contamination of recently recharged groundwaters in the conterminous United States.
Nitrate in ground waters of the United States--Assessing the risk (USGS Fact Sheet FS-092-96). This fact sheet was replaced by A national look at nitrate contamination of groundwater.
Nutrients in the Nation's waters--Too much of a good thing? (USGS Circular 1136).
Nutrients in ground water and surface water of the United States-- A summary of NAWQA's analysis of data through 1992. (Featured article in NWQEP Notes, the North Carolina State University Water Quality Group Newsletter, March 1996, based on USGS WRI95-4031.)
Nutrients in ground water and surface water of the United States--An analysis of data through 1992 (USGS Water-Resources Investigations Report 95-4031). (Press release 8/24/95)