CalGW Update 2020 - GW Quality Conditions (2009-2018)
The CalGW Update 2020 - GW Quality Conditions (2009-2018) dataset assesses statewide groundwater conditions based on a query of the GAMA database (provided by the State Water Resources Control Board). The original query searched GAMA for the maximum groundwater quality sampling result for each chemical with an established maximum contaminant level (MCL) or secondary maximum contaminant level (SMCL) from January 1, 2009, through December 31, 2018. All stations tagged as monitoring wells for permitted discharge sites, active contaminant investigations, or active cleanup sites were omitted from the dataset. The final queried dataset included more than 5 million records, more than can fit into an Excel spreadsheet, so this dataset was created summarizing the top 5 chemicals. The top 5 chemicals were determined by the highest percentage of stations that recorded a maximum value above the MCL or SMCL.
This dataset includes an excel spreadsheet and its associated shapefile. The summary includes the status of each measurement, which fall into one of three categories for each chemical with an established MCL or SMCL: High (maximum recorded value above the MCL or SMCL); Medium (maximum recorded value between half the MCL or SMCL and the MCL or SMCL); Low (maximum recorded values less than half of the MCL or SMCL).
This dataset was used to create Tables 6-4, 6-5, 6-7, 6-8, 6-9, 6-10, and 6-11. This dataset was used to create Figures 6-13, 6-14, 6-15, 6-16, 6-17, and 6-18.
Source: California's Groundwater Update 2020 (Bulletin 118)
About this Resource
| Last updated | unknown |
|---|---|
| Created | unknown |
| Name | CalGW Update 2020 - GW Quality Conditions (2009-2018) |
| Format | Zip File |
| License | License not specified |
| Created | 1 year ago |
| Media type | application/zip |
| has views | False |
| id | fd293358-1f7f-4435-b3d1-6646c402f2af |
| metadata modified | 1 year ago |
| package id | 292a4f68-2413-4c36-b12e-3ee5121cbbfc |
| position | 34 |
| state | active |