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- W580190045 abstract "The most common contaminants found in Arizona groundwater in concentrations above health-based drinking water standards are arsenic, fluoride, radioactive elements (responsible for gross alpha radiation), and nitrate. Nitrate contamination, although it can be natural, is usually due to either agricultural practices (excessive fertilizer use and/or poor irrigation practices), or failing septic systems that allow contaminated waters to drain into the aquifer. Naturally occurring groundwater contaminants are dependent on aquifer geology and are discussed below. Geologic forces have influenced the quality of water held within Arizona aquifers. The groundwater basins in the geologic past included river drainage systems that could not reach the sea, generating large inland lakes—such as the Great Salt Lake in Utah—that concentrated the salts as water evaporated. Large deposits of salt 1 are common across the state. These natural deposits are often associated with elevated groundwater concentrations of sodium, chloride, calcium, magnesium, sulfates, and carbonates. In the Gila River Valley, deep petroleum exploration boreholes were drilled during the early 1900’s through the thick layers of gypsum and salty clay found throughout the valley. Although oil was not found, salt brines are now discharging to the land surface through improperly sealed abandoned boreholes, and the local water quality has been degraded. Figure 1 shows those portions of the state where groundwater has been reported to be saline, either due to deep layers of salt originating from geologic deposition or due to agricultural practices where evaporation of irrigation water concentrates naturally occurring salts." @default.
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- W580190045 date "2009-11-01" @default.
- W580190045 modified "2023-09-27" @default.
- W580190045 title "Arizona Drinking Water Well Contaminants" @default.
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