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Aquifers

Bodies of rock that contain sufficient saturated permeable material to conduct ground water and to yield significant quantities of water to wells and springs. [Glossary of Geology, 4th ed.]

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Groundwater quality in the San Francisco Bay groundwater basins, California [More info]: The constituent present at high concentrations in the greatest proportion of the primary aquifer system was TDS, which is an indicator of salinity. Perchlorate was also present at moderate concentration in 42% of samples.
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 Southeast San Joaquin Valley, California [More info]: Arsenic and nitrate are the constituents found most commonly at high concentrations in the primary aquifers. Arsenic comes from natural sources and is affected by pH and dissolved oxygen.
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 Tahoe and Martis Basins, California [More info]: Recent study encountered occasional high values of radioactive trace elements, but the water quality in this area as monitored compares favorably to more urban areas studied by the same group.
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 of southeastern Wyoming [More info]: Explains how we assess groundwater quality here, what characteristics are important, and how they hurt or, in some cases, help use use the water.
Groundwater resources of Mosteiros basin, island of Fogo, Cape Verde, west Africa [More info]: Shallow groundwater has good quality, but salinity measured in wells suggests the thin lens of freshwater under the coastal plain will be vulnerable to saltwater intrusion as a consequence of pumping.
Groundwater Resources of Ribeira Faja Basin, Island of Sao Nicolau, Cape Verde, West Africa [More info]: Lower precipitation and recharge, with deeper groundwater levels, suggest this basin will be less susceptible to contamination than others nearby, but may be susceptible to saltwater intrusion brought on by well pumping.
Groundwater Resources of Ribeira Paul Basin, Island of Santo Antao, Cape Verde, West Africa [More info]

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