Status and understanding of groundwater quality in the South Coast Interior groundwater basins, 2008: California GAMA Priority Basin Project

Parsons, Mary C.; Kulongoski, Justin T.; Belitz, Kenneth

doi:10.3133/sir20145023

Cited by 1 publication

(4 citation statements)

References 21 publications

(37 reference statements)

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“…Consequently, arsenic is broadly prevalent at high concentrations: there are 32 study areas in which the areal-proportion exceeds 10% (Table S4c1, SI). Additional discussion of the factors affecting the occurrence of high concentrations of arsenic is provided in several USGS SIRs. ,− These study areas are distributed across eight of the nine hydrogeologic provinces.…”

Section: Resultsmentioning

confidence: 99%

“…Although oxic conditions generally prevail in California groundwater due to the climate, anoxic conditions do occur: there are 14 study areas in which the areal proportion for manganese exceeds 10% (Table S4c2, SI). The 14 study areas are distributed across seven hydrogeologic provinces, and additional discussion is provided in several USGS SIRs. − ,, …”

Section: Resultsmentioning

confidence: 99%

“…In addition, not all agricultural activities are associated with equally high loadings of nitrate from fertilizers or animal waste. , The areal proportion of nitrate exceeds 10% in 14 study areas (Table S4d, SI). − ,,,− They are distributed across just three provinces: SCR, TSPR, and SJV.…”

Section: Resultsmentioning

confidence: 99%

“…The 14 study areas are distributed across seven hydrogeologic provinces, and additional discussion is provided in several USGS SIRs. [49][50][51][52][53][54]57,58 High concentrations of uranium in California groundwater are associated with granitic rocks and alluvium derived from granitic rocks. In the eastern SJV, uranium also has been mobilized by downward-moving irrigation water with elevated bicarbonate concentrations.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

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Metrics for Assessing the Quality of Groundwater Used for Public Supply, CA, USA: Equivalent-Population and Area

Belitz

Fram

Johnson

2015

Environ. Sci. Technol.

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Data from 11,000 public supply wells in 87 study areas were used to assess the quality of nearly all of the groundwater used for public supply in California. Two metrics were developed for quantifying groundwater quality: area with high concentrations (km(2) or proportion) and equivalent-population relying upon groundwater with high concentrations (number of people or proportion). Concentrations are considered high if they are above a human-health benchmark. When expressed as proportions, the metrics are area-weighted and population-weighted detection frequencies. On a statewide-scale, about 20% of the groundwater used for public supply has high concentrations for one or more constituents (23% by area and 18% by equivalent-population). On the basis of both area and equivalent-population, trace elements are more prevalent at high concentrations than either nitrate or organic compounds at the statewide-scale, in eight of nine hydrogeologic provinces, and in about three-quarters of the study areas. At a statewide-scale, nitrate is more prevalent than organic compounds based on area, but not on the basis of equivalent-population. The approach developed for this paper, unlike many studies, recognizes the importance of appropriately weighting information when changing scales, and is broadly applicable to other areas.

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