Contamination and pollution
Introduction of harmful substances into the environment by human action or natural processes.
New York State pesticide monitoring homepage [ More info] Data on presence and distribution of pesticides in surface and ground water of New York State.
Northern Gulf of Mexico ecosystem change and hazard susceptibility [ More info] Map interfaces and data in the area offshore Louisiana, Mississippi, and Alabama which was affected most by hurricane Katrina and, more recently, the oil spill.
Nutrients National Synthesis Project: nutrients in rivers, streams, and aquifers in the United States [ More info] This Nutrients National Synthesis Project site on the U.S. study of nutrients, especially nitrogen and phosphorus, as contaminants in high concentrations links to an overview, study team, featured reports, publications, and national datasets.
Nutrients in the Nation's streams and groundwater: National findings and implications [ More info] Despite public sector efforts to reduce nonpoint-source nutrients in streams and rivers, concentrations have remained the same or increased, continuing to pose risks to aquatic life and human health.
Occurrence of Emerging Contaminants in Water and Bed Material in the Missouri River, North Dakota, 2007 [ More info] Water monitoring results, focused on wastewater compounds, human-health pharmaceutical compounds, hormones, and antibiotics in water, and waste indicators, hormones, and antibiotics in solids.
Occurrence of Escherichia coli in the Cuyahoga River in the Cuyahoga Valley National Park, Ohio [ More info] Explains how this important indicator bacteria is used to detect problems in the water supply that may affect human health, focusing on a specific recreational area.
Occurrence of selected radionuclides in ground water used for drinking water in the United States [ More info] Results (*.pdf) of a 1998 targeted reconnaissance survey on the sources of radium, polonium, and lead radionuclides, data collection and laboratory methods, existing occurrences in drinking water, risk assessments, and compliance monitoring.
Occurrence, distribution, and concentrations of selected contaminants in streambed- and suspended-sediment samples collected in Bexar County, Texas, 2007-09 [ More info] Study showing which chemicals found in sediments were most common, with methods used and likely consequences of their high concentrations.
Oil Pollution Impacts on Birds [ More info] A compilation of information, including reports, bibliographies, and data, on all aspects oil toxicity relevant to birds and other wildlife.
Operational guidelines for geological fieldwork in areas endemic for Coccidioidomycosis (Valley Fever) [ More info] Report giving operational guidelines that will lower the risk of coccidioidomycosis (Valley fever) for individuals who work outdoors in areas where the disease is endemic.
Alphabetical Index of Topics
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