Ground Water - Water Quality Results
Groundwater quality data and related groundwater well information available on the page was queried from the GAMA Groundwater information system (**[GAMA GIS](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**). Data provided represent a collection of groundwater quality results from various federal, state, and local groundwater sources. Results have been filtered to only represent untreated sampling results for the purpose of characterizing ambient conditions. Data have been standardized across multiple data sets including chemical names and units. Standardization has not been performed for chemical result modifier and others (although we are working currently to standardize most fields). Chemicals that have been standardized are included in the data sets. Therefore, other chemicals have been analyzed for but are not included in GAMA downloads. Groundwater samples have been collected from well types including domestic, irrigation, monitoring, municipal. Wells that cannot accurately be attributed to a category are labeled as "water supply, other". For additional information regarding the GAMA GIS data system please reference our **[factsheet](https://www.waterboards.ca.gov/publications_forms/publications/factsheets/docs/gama_gis_factsheet.pdf)**.
Data files
| Data title and description | Access data | File details | Last updated |
|---|---|---|---|
GAMA - All Wells (Location data only) | Download | CSV 63.36 MB | 05/24/21 |
GAMA - Department of Pesticide Regulation <p>This file contains statewide groundwater quality data for all chemicals in the Department of Pesticide Regulation (DPR) dataset. For more information about GAMA datasets, please refer to the **[dataset description]( https://gamagroundwater.waterboards.ca.gov/gama/GAMA_Data_Descriptions.pdf)** file on the **[GAMA data download page](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**.</p> | Download | CSV 12.29 MB | 05/20/21 |
GAMA - Department of Water Resources <p>This file contains statewide groundwater quality data for all chemicals in the Department of Water Resources (DWR) dataset. For more information about GAMA datasets, please refer to the **[dataset description]( https://gamagroundwater.waterboards.ca.gov/gama/GAMA_Data_Descriptions.pdf)** file on the **[GAMA data download page](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**.</p> | Download | CSV 307.65 MB | 05/20/21 |
GAMA - Division of Drinking Water (pre 2000) This file contains statewide groundwater quality data for all chemicals in the GAMA Division of Drinking Water (DDW) dataset. It contains data from public supply wells. Due to size constraints, the DDW data is split up by date. This file contains DDW data up to 1/1/2000. | Download | CSV 1.60 GB | 05/21/21 |
GAMA - Division of Drinking Water (2000-2009) This file contains statewide groundwater quality data for all chemicals in the GAMA Division of Drinking Water (DDW) dataset. It contains data from public supply wells. Due to size constraints, the DDW data is split up by date. This file contains DDW data from 1/1/2000 to 12/31/2009. | Download | CSV 1.86 GB | 05/21/21 |
GAMA - Division of Drinking Water (2010-2019) This file contains statewide groundwater quality data for all chemicals in the GAMA Division of Drinking Water (DDW) dataset. It contains data from public supply wells. Due to size constraints, the DDW data is split up by date. This file contains DDW data from 1/1/2010 to 12/31/2019. | Download | CSV 2.00 GB | 05/28/21 |
GAMA - Division of Drinking Water (2020 - present) This file contains statewide groundwater quality data for all chemicals in the GAMA Division of Drinking Water (DDW) dataset. It contains data from public supply wells. Due to size constraints, the DDW data is split up by date. This file contains DDW data from 1/1/2020 to present. | Download | CSV 1.02 GB | 05/21/21 |
GAMA - GAMA <p>This file contains statewide groundwater quality data for all chemicals in the GAMA Domestic Well (GAMA_DOM), GAMA Special Studies (GAMA_SP-STUDY) and GAMA USGS (GAMA_USGS) datasets. For more information about GAMA datasets, please refer to the **[dataset description]( https://gamagroundwater.waterboards.ca.gov/gama/GAMA_Data_Descriptions.pdf)** file on the **[GAMA data download page](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**.</p> | Download | CSV 141.46 MB | 05/17/21 |
GAMA - Irrigated Lands Regulatory Program <p>This file contains statewide groundwater quality data for all chemicals in the Irrigated Lands Regulatory Program (WB_ILRP) dataset. For more information about GAMA datasets, please refer to the **[dataset description]( https://gamagroundwater.waterboards.ca.gov/gama/GAMA_Data_Descriptions.pdf)** file on the **[GAMA data download page](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**.</p> | Download | CSV 53.01 MB | 05/20/21 |
GAMA - Local Groundwater Projects <p>This file contains statewide groundwater quality data for all chemicals in the Local Groundwater Projects (GAMA_LOCALGW) dataset. For more information about GAMA datasets, please refer to the **[dataset description]( https://gamagroundwater.waterboards.ca.gov/gama/GAMA_Data_Descriptions.pdf)** file on the **[GAMA data download page](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**.</p> | Download | CSV 133.07 MB | 05/20/21 |
GAMA - PFAS (Statewide) <p>This file contains statewide groundwater quality data for all PFAS constituents from all datasets on GAMA. For more information about GAMA datasets, please refer to the **[dataset description]( https://gamagroundwater.waterboards.ca.gov/gama/GAMA_Data_Descriptions.pdf)** file on the **[GAMA data download page](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**.</p> | Download | CSV 38.56 MB | 05/20/21 |
GAMA - USGS NWIS <p>This file contains statewide groundwater quality data for all chemicals in the USGS_NWIS dataset. For more information about GAMA datasets, please refer to the **[dataset description]( https://gamagroundwater.waterboards.ca.gov/gama/GAMA_Data_Descriptions.pdf)** file on the **[GAMA data download page](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**.</p> | Download | CSV 647.71 MB | 05/17/21 |
GAMA - Water Replenishment District (LA County) <p>This file contains statewide groundwater quality data for all chemicals in the Water Replenishment District (WRD) dataset. For more information about GAMA datasets, please refer to the **[dataset description]( https://gamagroundwater.waterboards.ca.gov/gama/GAMA_Data_Descriptions.pdf)** file on the **[GAMA data download page](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**.</p> | Download | CSV 307.25 MB | 05/20/21 |
GAMA GIS Subset for Natural Recharge Study <p>This file contains groundwater quality data for wells used in the **[Natural Recharge Study](https://gispublic.waterboards.ca.gov/portal/apps/storymaps/stories/101aac57c3514f038eef44587eee8a93)**. For more information about GAMA datasets, please refer to the **[dataset description]( https://gamagroundwater.waterboards.ca.gov/gama/GAMA_Data_Descriptions.pdf)** file on the **[GAMA data download page](https://gamagroundwater.waterboards.ca.gov/gama/datadownload)**.</p> | Download | CSV 59.48 MB | 04/08/24 |
Supporting files
| Data title and description | Access data | File details | Last updated |
|---|---|---|---|
GAMA Data Dictionary Description of field types for GAMA Groundwater Quality Results. | Download | EXCEL (XLSX) 422.65 KB | 05/17/21 |
More details
**[GAMA GIS factsheet](https://www.waterboards.ca.gov/publications_forms/publications/factsheets/docs/gama_gis_factsheet.pdf)**