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The Groundwater Ambient Monitoring and Assessment Program (GAMA) is an all-inclusive monitoring program for groundwater that was implemented in 2000 in California, United States. It was created by the California State Water Resources Control Board as an improvement from groundwater programs that were already in place.
California's groundwater levels rose significantly in 2023, one of the wettest years in decades. State officials say efforts to replenish aquifers helped.
Between 2022 and 2023, according to the new data, the nearly 100 groundwater basins and sub-basins tracked by the state logged 8.7 million acre-feet of total additional water.
The law was based on the idea that groundwater could best be managed at the local level, and it called for newly formed local agencies to gradually adopt measures to address chronic declines in ...
In 1980, DWR noted that of California's 450 groundwater basins that were defined at the time, 40 were in overdraft and 11 were identified as being in "critically overdrafted conditions" (COD). [5] Groundwater levels had dropped from 50 feet below historic levels and up to 100 feet below in the San Joaquin Valley.
Spirit Leveling data from the DWR, Delta-Mendota Water Authority, the Central California Irrigation District, and others are used to measure elevation change in a smaller area. The USGS uses the data from borehole extensometers provided by the DWR, and also utilizes information from piezometers to track changes in groundwater. [11]
Set by the California Department of Public Health in 1989, the maximum contaminant level for nitrates, in CCR §63341, is 45 milligrams per liter (mg/L) for nitrate as NO3 (equivalent to 10 mg/L for nitrate as nitrogen or “N”); 10 mg/L for nitrate plus nitrite as N; and 1 mg/L for nitrite as N. Currently, there is a secondary maximum ...
With long-term declines in groundwater levels putting thousands of domestic wells at risk and causing the ground to sink in parts of the San Joaquin Valley, state regulators are moving forward ...