California Water Science Center

Maps

Maps help us make sense of complex data and information. Many California Water Science Center Projects are built on a foundation of spatial data. Maps are and used to help analyze and understand information including water quality trends, optimal groundwater recharge locations, estuary flow patterns, areas of land subsidence and more. Maps of our maps provdide access to data directly. 

Explore mapped CA water information and data

Filter Total Items: 16
Date published: April 23, 2020

Domestic Wells in the United States

Domestic wells provide drinking water supply for approximately 40 million people in the United States. Knowing the location of these wells, and the populations they serve, is important for identifying heavily used aquifers, locations susceptible to contamination, and populations potentially impacted by poor-quality groundwater. 

Date published: March 25, 2020

Public-Supply Well Water Quality Results: Inorganic Data and Trends, 1974 - 2014 (California GAMA-PBP)

The GAMA-PBP Public-Supply Well Results data viewer allows the user to visualize and download California water-quality data and trends for1974 - 2014. Groundwater-quality data for 38 inorganic constituents are captured and can be downloaded for individual sites or by grid cell. 

Date published: February 21, 2020

Anza Hydrologic Data

A portal for easy access to USGS data collected during hydrogeologic research projects in Anza Valley, CA

Date published: February 21, 2020

Anza Valley Land Use (1934 - 2005)

Compares Anza Valley, CA land use data within the USGS study boundaries for 5 time periods between 1934 and 2005.

Date published: June 18, 2019

GAMA Public-supply Well (Deep Aquifer) Assessment Study Units

The GAMA program is a comprehensive statewide assessment designed to help better understand and identify risks to groundwater resources. Groundwater is sampled at many locations across California in order to characterize its constituents and identify trends in groundwater quality. The results of these tests provide information for water agencies to address a variety of water resource issues.

Date published: June 18, 2019

GAMA Domestic Well (Shallow Aquifer) Assessment Study Units

n 2012, the Groundwater Ambient Monitoring & Assessment Priority Basin Project (GAMA-PBP) began water-quality assessments of shallow aquifers, which are typically used for private domestic and small system drinking-water supplies. GAMA-PBP is designed to identify where and to what extent water quality of groundwater aquifers meets benchmarks that have been established for drinking water.

Date published: May 16, 2019

Coastal Drainage Basins in San Diego County, California

Coastal Basins of San Diego County, California, and Northern Baja California, Mexico.  Local features include the San Dieguito River Basin, San Diego River Basin, Sweetwater River Basin, and Otay River Basin.  Maps also display locations of groundwater-monitoring sites. 

Date published: January 30, 2019

Assessment of Groundwater Quality in the Borrego Valley

The quality of groundwater in the Borrego Valley is a concern because it is the sole source of water for agricultural, recreational, and public supply. Explore this interactive water-quality data map for detailed information and to download data.

Date published: December 18, 2018

San Antonio Creek Valley Hydrologic Monitoring

In order to understand the integrated hydrologic systems in the San Antonio Creek Valley, many different types of data are being gathered from both the surface water and groundwater system. Learn about these data types and explore them with the interactive map.

Date published: December 10, 2018

Lower Colorado River Hydrologic Monitoring

The Lower Colorado Monitoring Network is a series of groundwater-level and water-quality wells, as well as streamgages and micro-gravity sites. This interactive map displays the sites and provides links to the most current data.

Date published: December 7, 2018

Areas of Land Subsidence in California

In California, land subsidence—mostly from groundwater pumping—was first documented by the USGS in the early 20th century. Completion of State and Federal water projects that bring water from California's wet north to its dry south allowed some groundwater aquifers to recover, and subsidence decreased in these areas. Subsidence continues today, sometimes at high rates of more than 1 foot/year.

Date published: November 13, 2018

GAMA Priority Basin Project Groundwater-Quality Results: Assessment and Trends

This interactive webmap plots water-quality data from domestic and public-supply wells sampled by the USGS for the California Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Project (GAMA-PBP), and allows users to download datasets. The GAMA-PBP is a cooperative program between the California State Water Resources Control Board and the U.S. Geological Survey.