Groundwater Information

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Groundwater Monitoring Program

The Yolo Subbasin groundwater monitoring program is operated on a voluntary basis. Approximately 500 wells are monitored by our data cooperators each year. The YSGA is serving as the coordinator of all groundwater data in the Yolo Subbasin. Our cooperators include:

Subsidence

Under SGMA, land subsidence is considered a sustainability indicator. SGMA requires that GSAs investigate the connection and interaction between groundwater and land subsidence, and to demonstrate an absence of 'Significant and unreasonable land subsidence that substantially interferes with surface land uses'. Measurable objectives and minimum thresholds need to be established for land subsidence.