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Contamination and pollution
Introduction of harmful substances into the environment by human action or natural processes.
Subtopics:
Industrial pollution (25 items)
Nonpoint-source pollution (11 items)
Pesticide and herbicide contamination (24 items)
Pharmaceutical contamination (3 items)
Toxic radionuclide contamination (12 items)
Toxic trace element contamination (40 items)

Water pollution (13 items)
Soil pollution (1 items)
Air pollution (7 items)
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Results 71 - 80 of 183 listed alphabetically [list by similarity]
Groundwater quality in the Monterey Bay and Salinas Valley groundwater basins, California [More info]
This study of untreated groundwater indicates the number of samples in which inorganic or organic constituents occur in high or moderate in concentration. The study does not indicate significant problems in groundwater quality here.
Groundwater quality in the Northern Sacramento Valley, California [More info]
Results of a survey of contaminants in untreated groundwater in this area, separating inorganic from organic constituents.
Groundwater quality in the Northern San Joaquin Valley, California [More info]
Arsenic and boron were the trace elements that most frequently occurred at high concentrations. Fumigants (pesticides) were detected at high concentrations in 3% of the primary aquifers. Herbicides and insecticides were detected at low concentrations.
Groundwater quality in the Owens Valley, California [More info]
Trace elements boron, arsenic, and molybdenum were found at high concentrations in 15% of primary aquifers in this area.
Groundwater quality in the San Diego Drainages Hydrogeologic Province, California [More info]
Vanadium and boron were detected at high and moderate concentrations in this area. High concentrations for these constituents were detected almost exclusively in samples collected in the Temecula Valley study area.
Groundwater quality in the Santa Clara River Valley, California [More info]
This study of untreated groundwater indicates the number of samples in which inorganic or organic constituents occur in high or moderate in concentration. The study does not indicate significant problems in groundwater quality here.
Groundwater quality in the Southern Sacramento Valley, California [More info]
Results of a survey of contaminants in untreated groundwater in this area. Arsenic and boron were the trace elements occurring most frequently at high concentrations.
Groundwater quality in the Southern Sierra Nevada, California [More info]
Recent study indicating inorganic constituents as the primary items of concern in this area. Chemical and mineralogical compositions of the aquifer rocks probably explain variation among localities here.
Groundwater quality in the Upper Santa Ana Watershed study unit, California [More info]
Recent study indicating nitrate and perchlorate are the primary inorganic constituents of interest here, coming from human activities such as agriculture.
Groundwater quality in the north San Francisco Bay groundwater basins, California [More info]
Summary of chemical constituents of ground water that are of concern to human activity in this area. Arsenic is the constituent that occurs most frequently in high concentrations.
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