Untreated Groundwater Quality: Wells
Introduction
There are several types of wells being sampled and monitored by the GAMA Groundwater Information System. Contaminant sampling data for some Municipal, Domestic, Monitoring, Irrigation and Water Supply/Other are shown on this map. For each well, there are a number of samples collected, screening for common contaminants such as nitrates, arsenic and industrial chemicals.
How to Use this Dashboard
To use this page, first select the point tool in the top left corner of the map window. Then pan by clicking and dragging on the map or zoom by scrolling around in the map to find a well of interest. Select the well using the point tool. The indicators to the right of the map will adjust to show the sample result for the contaminants present in that well. Use the tabs or toggle arrows at the bottom of the indicators to view additional information about the contaminant, and to see results for other contaminants. Click on read more for more tips on using this dashboard.
If the well you select has no sample available for that contaminant, the indicator will read “No data available.”
The second tab shows a different way of viewing the same well-point data. The wells shown in the previous map are aggregated here by contaminant type to highlight areas with potentially high levels. To create this visualization, only data points for domestic and municipal wells with levels of contamination that exceed the threshold limit defined by GAMA for that constituent are shown. Select a constituent to view by selecting the boxes on the left of the map.
Data Sources
Click on read more for more context about the data used on this page.
Data presented here is from the GAMA (Groundwater Ambient Measuring and Assessment) Program. All data shown are collected between the years 2020-2021. For detailed information about these datasets, visit: https://gamagroundwater.waterboards.ca.gov/gama/gamamap/public/dataset_information.asp