Watershed- and Regional-Scale Contamination
The Toxics Program conducts watershed- and regional-scale investigations of legacy, current, and emerging contaminants
affecting aquatic ecosystems from common types of nonpoint and distributed point-source contamination. More about watershed- and regional-scale contamination investigations
Complete listing of watershed and regional scale investigations and projects >>
Other Watershed- and Regional-Scale Investigations
Watershed- and Regional-Scale Contamination Information
- Index of Bibliographies from Point-Source Investigations
- Index of Photo Galleries for Watershed- and Regional-Scale Contamination Investigations
- Crosscutting Topics Related to Watershed- and Regional-Scale Contamination
- Selected Fact Sheets on Watershed- and Regional-Scale Contamination
- USGS Toxic Substances Hydrology Program, 2010: USGS Fact Sheet 2010-3011
- Water quality in the Blue River Basin, Kansas City metropolitan area, Missouri and Kansas, July 1998 to October 2004: USGS Fact Sheet 2006-3103.
- Wastewater chemicals in Colorado's streams and ground water: USGS Fact Sheet 2004-3127.
- Trends in the water budget of the Mississippi River basin, 1949-1997: USGS Fact Sheet 2005-3020.
- Is septic waste affecting drinking water from shallow domestic wells along the Platte River in eastern Nebraska?: USGS Fact Sheet 072-03.
- Linking selenium sources to ecosystems--San Francisco Bay-Delta model: USGS Fact Sheet 2004-3091.
- Water quality of the Boulder Creek watershed, Colorado: USGS Fact Sheet 043-03.
- Mercury in stream ecosystems--New studies initiated by the U.S. Geological Survey: USGS Fact Sheet 016-03.
- Occurrence of antibiotics in water from fish hatcheries: USGS Fact Sheet 120-02.
- Glacial ice cores reveal a record of natural and anthropogenic atmospheric mercury deposition for the last 270 years: USGS Fact Sheet FS-051-02.
- Pharmaceuticals, hormones, and other organic wastewater contaminants in U.S. streams: USGS Fact Sheet FS-027-02.
- Malformed frogs in Minnesota--An update: USGS Fact Sheet FS-043-01.
- Nitrogen in the Mississippi Basin--Estimating sources and predicting flux to the Gulf of Mexico: USGS Fact Sheet 135-00.
- Mercury contamination from historic gold mining in California: USGS Fact Sheet FS-061-00.
- Discharge of herbicides from the Mississippi River Basin to the Gulf of Mexico, 1991-97: USGS Fact Sheet FS-163-98.
- Occurrence of cotton pesticides in surface water of the Mississippi Embayment: USGS Fact Sheet FS-022-98.
- Herbicides in rain fall across the Midwestern and Northeastern United States, 1990-91: USGS Fact Sheet FS-181-97.
- Herbicides in Midwestern reservoir outflows, 1992-93: USGS Fact Sheet FS-134-98.
- Herbicides in ground water of the Midwest--A regional study of shallow aquifers, 1991-94: USGS Fact Sheet FS-076-98.
- A reconnaissance for sulfonylurea herbicides in waters of the Midwestern USA: An example of collaboration between the public and private sectors: USGS Fact Sheet FS-046-98.
- Methods to identify areas susceptible to irrigation-induced selenium contamination in the Western United States: USGS Fact Sheet FS-O38-97.
- Source characterization of disinfection byproduct precursors in two Arkansas water-supply reservoirs: USGS Fact Sheet 118-97.
- Agricultural chemicals in Iowa's ground water, 1982-95 -- What are the trends: USGS Fact Sheet FS-116-97.
- Are walleye from Lake Roosevelt contaminated with mercury?: USGS Fact Sheet FS-102-97.
- Vulnerability of public drinking water supplies in New Jersey to pesticides: USGS Fact Sheet FS-165-96.
- Using Geochemical and Statistical Tools to Identify Irrigated Areas that Might Contain High Selenium Concentrations in Surface Water: USGS Fact Sheet FS-O77-96.
- Mercury Contamination of Aquatic Ecosystems: USGS Fact Sheet FS-216-95.
Meetings and Conferences
- USGS cosponsors the special session Nutrient Sources and Cycling in Aquatic Systems at the 2009 AGU Fall Meeting, San Francisco, California, December 14-18, 2009
- USGS cosponsors the special session Fate and Behavior of Pharmaceuticals in Treated Wastewaters, Sludge and River Waters at the SETAC 30th Annual Meeting, New Orleans, Louisiana, November 19-23, 2009
- The USGS sponsored the special session Endocrine Disrupting Chemicals--Analytical Methods and Environment Processes at the SETAC 30th Annual Meeting, New Orleans, Louisiana, November 19-23, 2009
- USGS and Montana Tech of the University of Montana co-sponsor the Special Session Diurnal Biogeochemical Processes in Rivers, Lakes, and Shallow Groundwater at the 2009 GSA Annual Meeting, Portland, Oregon, October 18-21, 2009
- USGS science featured at the AAAS symposium San Francisco Bay: Tracking and Understanding a Changing Estuary, San Francisco, California, August 17, 2009
- Effects and quantification of acid runoff from sulfide-bearing rock deposited during construction of Highway E18, Norway: Hindar, A., and Nordstrom, D.K., Applied Geochemistry, doi:0.1016/j.apgeochem.2014.06.016 (IN PRESS).
- Experimental studies to characterize uranium sequestration during biostimulated reduction and in response to the return of oxic conditions in shallow aquifers: Fuller, C.C., Johnson, K.J., Akstin, K.C., Singer, D.M., Yabusaki, S.B., Fang, Y., and Fuhrmann, M., U.S. Nuclear Regulatory Commission NUREG/CR-7178 (IN PRESS).
- Biogeochemical aspects of uranium mineralization, mining, milling, and remediation: Campbell, K.M., Gallegos, T.J., and Landa, E.R., Applied Geochemistry, doi:10.1016/j.apgeochem.2014.07.022 (IN PRESS).
- Diel cycling of trace elements in streams draining mineralized areas--A review: Gammons, C.H., Nimick, D.A., and Parker, S.R., Applied Geochemistry, doi:10.1016/j.apgeochem.2014.05.008 (IN PRESS).
- Mercury cycling in agricultural and managed wetlands, Yolo Bypass, California--Spatial and seasonal variations in water quality: Alpers, C.N., Fleck, J.A., Marvin-DiPasquale, M., Stricker, C.A., Stephenson, M., and Taylor, H.E., 2014, Science of the Total Environment, v. 484, no. 1, p. 276-287, doi:10.1016/j.scitotenv.2013.10.096.
- Mercury concentrations and distribution in soil, water, mine waste leachates, and air in and around mercury mines in the Big Bend region, Texas, USA: Gray, J.E., Theodorakos, P.M., Fey, D.L., and Krabbenhoft, D.P., 2014, Environmental Geochemistry and Health, doi:10.1007/s10653-014-9628-1 (Advanced Web release).
- Identifying non-point sources of endocrine active compounds and their biological impacts in freshwater lakes: Baker, B.H., Martinovic-Weigelt, D., Ferrey, M., Barber, L.B., Writer, J.H., Rosenberry, D.O., Kiesling, R.L., Lundy, J.R., and Schoenfuss, H.L., 2014, Archives of Environmental Contamination and Toxicology, v. 67, no. 3, p. 374-388, doi:10.1007/s00244-014-0052-4.
- Widespread occurrence of neonicotinoid insecticides in streams in a high corn and soybean producing region, USA: Hladik, M.L., Kolpin, D.W., and Kuivila, K.M., 2014, Environmental Pollution, v. 193, p. 189-196, doi:10.1016/j.envpol.2014.06.033.
- Transgenic zebrafish reveal tissue-specific differences in estrogen signaling in response to environmental water samples: Gorelick, D.A., Iwanowicz, L.R., Hung, A.L., Blazer, V.S., and Halpern, M.E., 2014, Environmental Health Perspectives, v. 122, no. 4, p. 356-362, doi:10.1289/ehp.1307329.
- Riverbank filtration potential of pharmaceuticals in a wastewater-impacted stream: Bradley, P.M., Barber, L.B., Duris, J.W., Foreman, W.T., Furlong, E.T., Hubbard, L.E., Hutchinson, K.J., Keefe, S.H., and Kolpin, D.W., 2014, Environmental Pollution, v. 193, p. 173-180, doi:10.1016/j.envpol.2014.06.028.
- Channel catfish (Ictalurus punctatus) leukocytes express estrogen receptor isoforms ERα and ERβ2 and are functionally modulated by estrogens: Iwanowicz, L.R., Stafford, J.L., Patiño, R., Bengten, E., Miller, N.W., and Blazer, V.S., 2014, Fish and Shellfish Immunology, v. 40, no. 1, p. 109-119, doi:10.1016/j.fsi.2014.06.021.
- Assessing the potential effects of fungicides on nontarget gut fungi (Trichomycetes) and their associated larval black fly hosts: Wilson, E.R., Smalling, K.L., Reilly, T.J., Gray, E., Bond, L., Steele, L., Kandel, P., Chamberlin, A., Gause, J., Reynolds, N., Robertson, I., Novak, S., Feris, K., and White, M.M., 2014, JAWRA Journal of the American Water Resources Association, v. 50, no. 2, p. 420-433, doi:10.1111/jawr.12166.
- Toxicity and accumulation of silver nanoparticles during development of the marine polychaete Platynereis dumerilii: García-Alonso, J., Rodriguez-Sanchez, N., Misra, S.K., Valsami-Jones, E., Croteau, M.-N., Luoma, S.N., and Rainbow, P.S., 2014, Science of the Total Environment, v. 476-477, p. 688-695, doi:10.1016/j.scitotenv.2014.01.039.
- Mercury in the national Parks: Flanagan Pritz, C., Eagles-Smith, C.A., and Krabbenhoft, D., 2014, The George Wright Forum, v. 31, no. 2, p. 168-180.
- Assessment of endocrine-disrupting chemicals attenuation in a coastal Plain stream prior to wastewater treatment plant closure: Bradley, P.M., and Journey, C.A., 2014, Journal of the American Water Resources Association, v. 50, no. 2, p. 388-400, doi:10.1111/jawr.12165.
- Reproductive health indicators of fishes from Pennsylvania watersheds--Association with chemicals of emerging concern: Blazer, V.S., Iwanowicz, D.D., Walsh, H.L., Sperry, A.J., Iwanowicz, L.R., Alvarez, D.A., Brightbill, R.A., Smith, G., Foreman, W.T., and Manning, R., 2014, Environmental Monitoring and Assessment, v. 186, no. 10, p. 6471-6491, doi:10.1007/s10661-014-3868-5.
- Global biogeochemical implications of mercury discharges from rivers and sediment burial: Amos, H.M., Jacob, D.J., Kocman, D., Horowitz, H.M., Zhang, Y.X., Dutkiewicz, S., Horvat, M., Corbitt, E.S., Krabbenhoft, D.P., and Sunderland, E.M., 2014, Environmental Science and Technology, v. 48, no. 16, p. 9514-9522, doi:10.1021/es502134t.
- Contaminants of emerging concern in fresh leachate from landfills in the conterminous United States: Masoner, J.R., Kolpin, D.W., Furlong, E.T., Cozzarelli, I.M., Gray, J.L., and Schwab, E.A., 2014, Environmental Science--Processes and Impacts, v. 16, no. 10, p. 2335-2354, doi:10.1039/C4EM00124A.