Groundwater Info Center
Groundwater Quality Monitoring

California's future water supply depends on groundwater and its water quality must be monitored and protected. Groundwater basins across the state are assessed by DWR Districts and other cooperators to determine water quality, identify areas of poor quality, and to track long-term changes in groundwater quality. Though DWR has no statutory authority to protect groundwater quality and our role in groundwater protection is limited, we have a long-standing groundwater quality monitoring network.

The DWR Regions collect groundwater samples to be analyzed for mineral, nutrient, minor element characteristics and contamination as well as for overall quality and usage. Some Regions may provide equipment and technical expertise to collect representative groundwater samples. The Regions together with DPLA Headquarters develop databases for groundwater levels, and groundwater quality.

Water Data Library (WDL)

WDL contains hydrologic data (groundwater level data and some groundwater quality data) for over 35,000 wells California. The data is collected by DWR Region Offices and dozens of local and federal cooperators. WDL's easy on-line data retrieval provides information quickly!
>> WDL website...

For more information on groundwater quality monitoring activities in your area, go to the appropriate DWR Region below.