Sylvia V Stork Adelia M McGregor Mariia Balkan Jose Arroyo-Lopez Joseph G. Borkovich Vong Lor Sherman Peng Monica Jasper Emily Haugen Andrew Soldavini Christian Estrada Connor McVey Deanna Grechkosey James Koepke Nicole Oldham Robert Vroman Renee Handley George L Bennett 20190808 tabular digital data USGS California Water Science Center USGS California Water Science Center https://doi.org/10.5066/P9R1V41Q This Well Completion Report geospatial dataset represents an index to a subset of records available from the California Department of Water Resources' (DWR) Online System for Well Completion Reports (OSWCR). This version of the release contains data from about 222,000 well completion reports (WCRs) for water supply wells from Amador, Butte, Calaveras, Colusa, El Dorado, Glenn, Kings, Merced, Nevada, Placer, Riverside, Sacramento, San Bernardino, San Joaquin, Shasta, Stanislaus, Sutter, Tehama, Tulare, and Yuba counties. A subset of WCRs for wells that are not water supply wells also are included. The California Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP) did studies of water quality in groundwater resources used by domestic wells in parts of those counties in 2015-2021, and these data were compiled as part of those studies. A few WCRs from additional counties have been included because the WCRs were initially incorrectly assigned to one county and are now reported with their correct county assignment. This dataset differs from the data provided in OSWCR because it includes data for some additional fields, some data attributed in OSWCR were checked for accuracy and updated, and more precise locations were determined for some wells. The additional fields provide more detail about the open or perforated intervals in the well, various identification numbers for the wells, and generalized lithology, and were populated where they could be identified. Some attributes have been provided by cooperating entities as indicated in the REFERENCE field. About 60 percent of the locations are georeferenced to finer resolution based on county APN, 911, or local water authority geospatial datasets. The attributed information is linked to the redacted publicly available image when the link can be resolved. This dataset is for information purposes only. All attribute values should be verified by reviewing the original Well Completion Report. California Water Code Section 13752 allows for the release of redacted copies of well completion reports to the public. DWR is the authoritative source of these data. https://data.ca.gov/dataset/well-completion-reports Changes in Version 2.0 1) Ten authors were added to include USGS staff who worked on the project since publication of Version 1.0 2) About 120,000 new rows were added to the dataset, for well completion reports from eleven additional counties: Butte, Colusa, Glenn, Kings, Merced, Riverside, San Joaquin, Shasta, Stanislaus, Tehama, and Tulare. 3) Text in the Abstract/Summary, Purpose, Process Steps, and Use Constraints sections and for some of the attribute descriptions were revised to improve clarity of explanations. 4) Data fields were added for seal depth and seal material and a field was added to indicate in which version of the data release the row was first published. 5) Minor corrections made to entries in the original about 100,000 rows of data. Version 1.0 can be obtained by request from G.L. Bennett, V (georbenn@usgs.gov) The primary purpose of this dataset is to present data compiled from well completion reports (WCR) on the location, construction characteristics, and identification of domestic and public supply wells in selected counties in California.A subset of WCRs for other types of water supply wells and non-water supply wells were also attributed in a subset of the counties. The data compilation was part of the California Groundwater Ambient Monitoring and Assessment (GAMA) Program, and used for identifying potential wells for sampling by the USGS for the GAMA project and for characterizing the temporal and spatial distribution of domestic wells. These attributed data will also be used to update the DWR OSWCR database. This is an ongoing project. Data will be added, typically by county. 18800101 20200920 See Supplemental Info Planned As needed -124.3900 -114.1200 42.0000 32.5300 USGS Metadata Identifier USGS:5d014866e4b05cc71cad26f7 ISO 19115 Topic Category inlandWaters geoscientificInformation Groundwater Well Completion Report USGS Thesaurus groundwater rocks and deposits well drilling Marine Realms Information Bank (MRIB) keywords groundwater water well USGS Metadata Identifier USGS:5d014866e4b05cc71cad26f7 Common geographic areas California None. Please see 'Distribution Info' for details. The following use constraints are taken from the California Department of Water Resources Online System for Well Completion Reports and are repeated here for clarity since the data reported from that system serves as the underlying dataset for this compilation and update effort. The well completion report data and application are subject to change, and are for informational purposes only. All information displayed on the map and in attribute tables should be verified by reviewing the original Well Completion Report. Known issues include: 1) Missing and duplicate records. Missing values; either missing on original Well Completion Report, or not key entered into database, and 2) Incorrect values (e.g. wrong Latitude, Longitude, Record Type, Planned Use, Total Completed Depth) Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. George Bennett USGS California Water Science Center Hydrologist mailing and physical

Placer Hall, 6000 J Street

Sacramento CA 95819 USA 916-278-3099 Funding provided by the California State Water Resources Control Board Groundwater Ambient Monitoring and Assessment Program. MSSQLSERVER 2016 (SQL Server 13.0.5292.0) Filename: view.WCR_Publish_date.txt California Department of Water Resources 20181220 tabular digital data https://data.ca.gov/dataset/well-completion-reports The following disclaimer is taken from the California Department of Water Resources Online System of Well Completion Reports and is repeated here to emphasize that data retrieved from that system serve as the underlying source of data for this compilation and update effort: This dataset is for information purposes only. All attribute values should be verified by reviewing the original Well Completion Report. Among the known data issues are: missing and duplicate records, missing values (either missing on original Well Completion Report, or not entered into database), missing links to some of the redacted images, and incorrect values (e.g. incorrect Latitude, Longitude, Record Type, Planned Use, Total Completed Depth). The data published in this data release may be more accurate than the underlying dataset, which is the main objective of the work. However, the above disclaimer still applies, and values should be verified by reviewing the original Well Completion Report which is the definitive source of information. Following attribution of the WCRs, some logical consistency checks were made, for example to verify that hole depth was greater than or equal to the depth of the constructed well, however these checks were not exhaustive. This Well Completion Report (WCR) geospatial dataset represents an index to a subset of records available from the California Department of Water Resources' (DWR) Online System for Well Completion Reports (OSWCR). The USGS California Water Science Center GAMA project has provided additional attributes and, in some cases, finer location information. The list of fields included in the attributed data increased over the period of this project, so earlier data are sparser. Not all data have a link to the publicly available WCR image. In any given county the focus of the work was on wells located within the boundaries of the GAMA-PBP study unit. If time allowed wells outside of the study unit would also be attributed. The subset includes Water Supply, Test Well, and Observation Planned Uses for selected areas in California. Only WCRs checked or attributed by USGS staff are included in this Data Release. Horizontal Accuracy varies greatly. The method used to determine horizontal position is indicated in the LOCATION_FROM field. Vertical positions are not provided in this dataset. California Department of Water Resources 20181220 tabular digital data https://water.ca.gov/Programs/Groundwater-Management/Wells/Well-Completion-Reports https://data.ca.gov/dataset/well-completion-reports Digital and/or Hardcopy 18800101 20200920 publication date California Department of Water Resources Online System for Well Completion Reports (OSWCR) California Department of Water Resources Well Completion Reports Elise Watson Tyler Johnson Danielle Dupuy 2022 2 dataset https://www.sciencebase.gov U.S. Geological Survey https://doi.org/10.5066/p931pzrc Digital and/or Hardcopy 2012 2022 publication date Watson and others (2022) locations and boundaries of GAMA-PBP study units for assessment of water quality in groundwater resources used for domestic supply Unredacted and redacted Well Completion Report (WCR) images, indexes to both sets of images, and indexes to WCR data are received from CA Department of Water Resources (DWR) and loaded into an internal USGS database. The WCRNumber is the primary key in the DWR OSWCR system. However, DWR has not yet entered all WCR images into the public OSWCR system that hosts the redacted images, therefore there are some unredacted images that do not have DWR-assigned WCRNumbers. The WCRN is the Primary Key in the USGS internal WCR database and is equal to the DWR-assigned WCRNumber if it exists at the time the WCR image is added to the USGS internal WCR database. For WCR images that do not have WCRNumbers, an alphanumeric code beginning with "GAMA" is assigned and used as the WCRN. DWR may assign WCRNumbers to WCR images after the image has been assigned a GAMA alphanumeric code, and these new WCRNumbers are added to the WCRNumber field as they become available and can be definitively matched to a WCR with a GAMA alphanumeric code in the WCRN field. 2021 The image index which contains the file path to the images is staged by GAMA-PBP project-defined study area and county. If duplicate images for a WCRNumber are identified, they are removed. The WCR index is staged, and existing data are cleaned, normalized and parsed into the USGS format. 2021 Images are linked in the USGS attribute table. All WCRNumbers without duplicate images are linked. In some cases, multiple page images are combined into new images and linked to the associated WCRNumber. In some cases, duplicate images are identified and one image is linked to the associated WCRNumber. WCRNumbers associated with the duplicate or successive index page images are removed from the USGS attribute table. The difficulty in dealing with duplicate images is complicated because the OSWCR data set contains a high percentage of duplicate scanned images with unique WCRNumbers that are the result of older scanning practices. Also, multipage documents were scanned individually by contractors for DWR. Resolving these issues is a time consuming and difficult process. 2021 Data Entry databases (in Access) are compiled by County with Assessor's Parcel Number data, building footprint data (if available), 911 lists (if available) and associated lookup tables for data entry normalization. In some cases, data have been previously attributed by other entities. These are evaluated on a county by county basis and may be used for prioritizing the USGS attribution effort (e.g. PlannedUse, DateCompleted) or accepted as is into the USGS dataset. The Access Data Entry form is linked with the USGS MAIN data table in the SQLServer2016 database. Staff opens the Access data entry form and the unredacted WCR image, confirms or updates the well's construction and location attributes that may or may not have been already entered in OSWCR. Locations are geo-referenced, either by matching APN or address on the WCR or defaulting to centroid of MTRS if the geo-referencing to APN or address does not resolve correctly. Location information provided by other entities may also be used to geocode the well location in some cases. The data captured has changed over the years due to changing data quality objectives, changing DWR data, and changing project goals. 2022 The index to redacted images is cleaned by county, with URLs that do not resolve to an image removed from the index using a python script. WCRNumbers with duplicate redacted images are generally not included in the USGS published dataset. The URL for the redacted image is entered into the OSWCR_URL field. Water Supply, Test Well and Observation PlannedUse wells are flagged in the SQLServer 2016 database for inclusion in this dataset. Test Wells that are clearly for monitoring purposes may be screened out. 2022 WCRs are selected for attribution by county and the counties are selected in an order the corresponds to the counties where the GAMA-PBP studies of water quality in groundwater resources used for domestic supply are done. Within those counties, WCRs with PlannedUse Domestic or Public/municipal were the highest priority for attribution. Depending on the county, WCRs from other PlannedUses (for example irrigation wells) were attributed. In some cases, only the WCRs located in the part of the county located within the boundary of the GAMA-PBP study unit are attributed. Study unit boundaries are provided by Watson and others (2022). This version of the DR includes counties corresponding to the following study units: number; Study unit description; Counties S4; Kaweah, Tule, and Tulare Lake basins and adjacent highlands; Counties: Tulare, Kings S5; Yuba and Bear River Watersheds; Counties: Yuba, Sierra, Nevada, Placer S6; Mokelumne, Cosumnes, and American River Watersheds; Counties: Placer, El Dorado, Amador, Calaveras S7; Cosumnes and American basins; Counties: Sacramento, Placer, Sutter, Amador S8; Western Mojave Desert basins; Counties: San Bernardino S9; Northern Sacramento Valley; Counties: Shasta, Tehama S10; Northern San Joaquin Valley; Counties: San Joaquin, Calaveras, Stanislaus S11; Coachella Valley; Counties: Riverside S12_S13; Modesto, Turlock, and Merced basins; Counties: Stanislaus, Merced S14; Butte, Sutter, and Yuba basins and adjacent highlands; Counties: Butte, Sutter, Yuba, Tehama, Glenn, Colusa Watson and others (2022) 2022 For publication of results a tab-delimited text file is output from the internal USGS database. That file contains a subset of the fields stored in the USGS internal Well Completion Report database and is provided to users in this data release. 2022 WCR_Jan_2023.txt Text file Producer Defined WCRNumber California Department of Water Resources OSWCR Primary Key Producer Defined << empty cell >> WCR has not yet been linked to a WCR with a WCRNumber in the OSWCR system Producer Defined WCRNumber is the Primary Key in the California Department of Water Resources Online System for Well Completion Reports (OSWCR). May be missing because not all images have been mapped to the current list of WCR publicly available from OSWCR. WCRN Primary Key in the USGS internal WCR database Producer Defined WCRN is the Primary Key in the USGS internal WCR database. WCRN is the same as WCRNumber if the well completion report (WCR) had a WCRNumber in the California Department of Water Resources Online System for Well Completion Reports (OSWCR) at the time USGS staff attributed data from the WCR image into the USGS internal WCR database. For WCR images that did not have WCRNumbers assigned by OSWCR at the time, the WCRN is an alphanumeric code beginning with the prefix "GAMA". LegacyLogNo Legacy Log Number assigned to the WCR by the California Department of Water Resources or other agency prior to creation of the WCRNumber system Producer Defined << empty cell >> The WCR did not have a Legacy Log Number. Producer defined The LegacyLogNo is the log number assigned to WCRs by the California Department of Water Resources or other agency prior to creation of the WCRNumber system. LegacyLogNo is not necessarily a unique identification number for a well. County County Producer Defined County name MTRS Meridian, Township, Range, Section from Extrapolated California Public Land Survey System (PLSS) Grid location. May not match the Bureau of Land Management (authoritative source) designation. Producer Defined << empty cell >> MTRS not available. Producer defined Meridian, Township, Range, Section from Extrapolated California Public Land Survey System (PLSS) Grid location. May not match BLM (authoritative source) designation. The extrapolated PLSS is a California Department of Pesticide Regulation (CDPR) product https://www.cdpr.ca.gov/docs/emon/grndwtr/gis_shapefiles.htm OSWCR_URL Link to the public redacted image from the California Department of Water Resources' (DWR) Online System for Well Completion Reports (OSWCR), where available. Producer Defined << empty cell >> link to public redacted image in the DWR OSWCR system not available Producer defined Link to the public redacted image from the California Department of Water Resources' (DWR) Online System for Well Completion Reports (OSWCR), where available. Not all data can be linked to a publicly available scan. Missing scans may be available from the authoritative source, DWR, https://data.ca.gov/dataset/well-completion-reports Address Well address exists in County Assessor data or other available County data. This is not necessarily the address indicated on the Well Completion Report. Producer Defined << empty cell >> Well address not available Producer defined Well address exists in County Assessor data or other available County data. This is not necessarily the address indicated on the Well Completion Report. City City Producer Defined << empty cell >> City not available Producer defined Either as indicated on the form or resolves from Address or APN. AddressFrom Address exists with reference to Address, APN, or other source as indicated. Producer Defined << empty cell >> Address could not be identified with reference to Address, APN, or other source as indicated. Producer defined DWR WCR Address as indicated on the Well Completion Report exists with reference to Assessor's Parcel data, County 911 Address data, or other data source as indicated in the Reference field. Producer defined APN Address as indicated in the County assessor's parcel dataset Producer defined Google Earth Address as resolved from Google Earth Producer defined Parcel Quest Address resolved from information on the Well Completion Report in the online Parcel Quest data Producer defined APN-CoAssessor 20170918 Addresses resolved from the San Bernardino Assessors Parcel data by the Mojave Water Agency Producer defined APN APN exists with reference to Address, APN, or other source as indicated. Producer Defined << empty cell >> APN not available Producer defined Assessors Parcel Number exists in County Assessor data or other available County data. This is not necessarily the APN indicated on the Well Completion Report. APNFrom APN is from Producer Defined << empty cell >> Assessor's Parcel Number (APN) could not be identified with reference to Address, APN, or other source as indicated. Producer defined DWR WCR Assessor's Parcel Number (APN) as indicated on the Well Completion Report exists with reference to Assessor's Parcel data or other data source as indicated in the Reference field. Producer defined Address APN as indicated in the County assessor's parcel dataset based on the Address on the Well Completion Report Producer defined ParcelQuest APN resolved from information on the Well Completion Report in the online ParcelQuest data Producer defined Mojave Water Agency Assessor's Parcel Number obtained from Mojave Water Agency data Producer defined OSWCR contractor Assessor's Parcel Number obtained from OSWCR contractor Producer defined Activity Activity described on the WCR Producer Defined << empty cell >> The activity field was not populated during data compilation by the USGS. The RecordType field in the OSWCR database may contain information about activity. Producer defined New Well The activity is New Well. Producer defined Not Specified The activity is not specified. Producer defined Other The activity is marked with other. Producer defined Destroy The well was destroyed or abandoned. The well may have been drilled previously or have not produced sufficient water. Producer defined Reseal The activity is to reseal the well sometime after the well was completed. Producer defined Deepen A previously completed well was redrilled and deepened. Producer defined Repair The activity is to repair or recondition an existing well. Producer defined Liner A liner was installed in a previously completed well. Producer defined Hydrofrack Hydraulic fracturing of a well to increase discharge. Producer defined Capped A previous completed well was capped. Producer defined Dry well Test well boring that encountered no water. Producer defined Not legible The WCR has an activity listed but it is not legible. Producer defined Orientation Orientation of well Producer Defined << empty cell >> The orientation of the well is assumed to be vertical if this field is null. Producer defined Horizontal The orientation of the well is horizontal. Producer defined Angle The orientation of the well is at an angle that is not horizontal or vertical. Producer defined PlannedUse Planned Use of the well Producer Defined The terminology for Planned Use categories has changed over time on the WCRs, and entries in this field are entered as on the WCR and not regularized to a consistent terminology. PlannedUse entries for water supply wells that will be used for domestic drinking water supply or household water use - Domestic - Water Supply Domestic PlannedUse entries for water supply wells that will be used for public drinking water supplies - Public - Water Supply Public - Community PlannedUse entries for water supply wells that will be used for irrigation. - Irrigation - Irrigation - Agriculture - Irrigation - Landscape PlannedUse entries for water supply wells that will be used for other specified uses: - Aquaculture - Dairy - Industrial - Stock or Animal Watering - Public - Snow Making - Other PlannedUse of Water Supply means that information on the WCR indicates the well will be used for water supply but no specific use is listed. PlannedUse of Test Well commonly means a well initially drilled for some type of water supply, but the well was not completed because it produced insufficient water for the intended use. PlannedUse of Unknown means that the WCR did not specify a planned water use. This includes wells where Activity = Destroyed because WCRs for well destruction generally do not indicate the prior use of the well. Although this data compilation is focused on Water Supply wells, data were compile for some other wells that are not Water Supply wells. Note that the WCRs for wells that are not water supply wells are a random subset of the total number of WCRs that exist in the OSWCR database for wells that are not water supply wells. - Extensometer (well used to house instrumentation for monitoring subsidence) - Observation (well is used to monitor water levels, water quality, or other aquifer conditions, and water extracted from the well is not used for purposes other than that monitoring) - Vapor extraction (well is used to extract volatile organic compound contaminants from the aquifers system) YearWellCompleted Year Well Completed Producer Defined << empty cell >> Year completed is not shown on the well completion report and cannot be extrapolated from other information on the WCR. Producer defined 1880 2018 YEAR as an integer value 1 DateWellCompleted Date Well Completed Producer Defined << empty cell >> Year completed is not shown on the well completion report and cannot be extrapolated from other information on the WCR. Producer defined Can be: Date completed, Date started, Date signed, Date of permit, Date received by the Department of Water Resources HoleDepth Hole Depth Producer Defined << empty cell >> Hole depth not attributed or not available. Producer defined 2.5 2600 Feet below land surface CompletedDepth The total depth of the completed well. Can be: Depth the driller indicates constitutes the completed well, depth of casing, or depth of hole, in feet. Producer Defined << empty cell >> Completed well depth not attributed or not available. Producer defined 3.0 4200.0 Feet below land surface TopOfOpenings Can be: Top of the upper screened interval, bottom of a casing with no screened interval, bottom of the surface seal, in feet Producer Defined << empty cell >> Top of openings not attributed or not available. Producer defined 0 1614 Feet below land surface NumberOpenIntervals Number of open intervals in the well casing. Producer Defined << empty cell >> No information about the number of perforations was available on the well completion report. Producer defined 0.0 19 GeneralizedLithology Generalized lithology Producer Defined << empty cell >> Generalized lithology not attributed or not available. Producer defined Generalized lithology. How the lithology is generalized will depend on the person doing the attribution. The geologic and hydrologic training and schooling of the students doing the generalization varies widely. The general guidance given to staff was that wells in alluvial sediments have descriptions on the well completion reports like sand, clay, silt, and gravel and could be generalized and attributed as “alluvial”. Wells in other materials often referred to as “Hard Rock” included terms like metamorphic, granitic, or volcanic on the well completion reports and therefore could be attributed as “Hard Rock”. There is no specific metric for assigning these values and the generalized lithology assigned to a given well was subjective. StaticWaterLevel Depth to Static Water as indicated on the well completion report Producer Defined << empty cell >> Static water level not attributed or not available. Producer defined 0 1000 Depth in feet TopOfPerfInterval Depth from land surface to top of topmost perforated interval. Independent of but potentially the same as TopOfOpenings for may wells depending on how the well was constructed. This field only reports the uppermost opening of the mechanically perforated portion of a wells casing. Producer Defined << empty cell >> Top of perforated interval not attributed or not available. Producer defined 0.0 1040 Feet below land surface BottomOfPerforatedInterval Depth from land surface to bottom of bottommost perforated interval Producer Defined << empty cell >> Bottom of perforated interval not attributed or not available. Producer defined 20.9 1865.0 Feet below land surface OwnerWellNo Owner well number entered on the WCR Producer Defined << empty cell >> Owner well number not available Producer defined WCRs may contain identification numbers for wells that are assigned by the well owner. DrillingCompany Name of Drilling Company Producer Defined << empty cell >> Name of drilling company not attributed or not available Producer defined May be the name of the driller. DrillerLicenseNo Driller License Number Producer Defined << empty cell >> Driller's license number not attributed or not available Producer defined Driller's License Number SealDepth Depth of the Surface Sanitary Seal from the surface. Producer Defined << empty cell >> Seal depth not attributed or not available. Producer defined These data were entered from the Water Well Drillers reports starting in 2020. These data are not always reported on every Well Completion Report. A borehole that was backfilled with cuttings is for the purposes of this data set not considered to have a surface sanitary seal. SealMaterial Material used for the Surface Sanitary Seal. Producer Defined << empty cell >> Seal depth not attributed or not available. Producer defined These data were entered from the Water Well Drillers reports starting in 2020. These data are not always reported on every Well Completion Report. A borehole that was backfilled with cuttings is for the purposes of this data set not sealed. Remark Remark Producer Defined << empty cell >> no remark entered Producer defined Miscellaneous remark DD_LONGITUDE Longitude Producer Defined -123.02479 -114.1365822 Decimal Degrees DD_LATITUDE Latitude Producer Defined 32.405082 41.941586 Decimal Degrees DATUM Datum of Latitude and Longitude Producer Defined WGS84 Geodetic datum code as explained at https://gisgeography.com/geodetic-datums-nad27-nad83-wgs84/. WGS84 may be assumed based on the year of the well completion report. Producer defined NAD83 Geodetic datum code as explained at https://gisgeography.com/geodetic-datums-nad27-nad83-wgs84/. Producer defined UNKNOWN Datum is unknown Producer defined NAD27 Geodetic datum code as explained at https://gisgeography.com/geodetic-datums-nad27-nad83-wgs84/. Producer defined LOCATION_FROM Location based on what information. Producer Defined Not constrained: Address, APN, TR, TRS, TRSQQ, Google Earth, LatLong on WCR, etc. REFERENCE Reference for location. Producer Defined Typically the derived centroid of the referenced polygon. For Location Methods based on township and range information, the PLSS shapefiles from the CA Department of Pesticide Regulation are used. The official Bureau of Land Management (BLM) PLSS polygons do not cover many areas in CA and are not used by the Department of Water Resource, the CA State Well Numbering Authority. If the actual Township-Range-Section (TRS) falls outside the County the centroid of the TRS may be derived from Google Earth. https://www.cdpr.ca.gov/docs/emon/grndwtr/gis_shapefiles.htm For Address and Assessor's Parcel Number (APN) Location Methods, the derived centroid of the referenced polygon from the County Assessor’s Office is typically used. Some Counties have addresses referenced to the location of the building, and those are used where available. Latitude/Longitude on WCR: This may be either from the Driller at the site or assigned by DWR when reviewing the WCR in the office. Typically there is no datum specified, but the datum is assumed to be WGS84. City: Sometimes the only location information on the WCR is the name of the city. The City location on Google Earth is used. The actual locations of these wells may be miles away. WCR: A few selected wells are located from a combination of information on the WCR and search results from ParcelQuest or online mapping applications for queries based on APN, street address, etc. These are typically sparsely populated areas or Public wells. USGS and USGS NWISWeb: The location as stored in the NWIS database. The locations for these wells have typically been field checked. Not Located: Well was assigned a County by DWR, but no location information is included on the WCR. For the purpose of including such a well in the WCR geospatial index, multiple possibilities exist: USGS geospatial technician assigned a single arbitrary location in the county, location data from Local Agencies are referenced with the Agency Name, other references exist. USGS_SiteNumber USGS National Water Information System Agency Code and Site Number Producer Defined << empty cell >> WCR has not been linked to a site in the USGS NWIS database Producer defined The combination of Agency Code and Site Number uniquely identify sites in the USGS National Water Information System (NWIS) database. For sites established in NWIS by the USGS, the agency codes is USGS. https://help.waterdata.usgs.gov/codes-and-parameters DWR_StateWellNumber California Department of Water Resources State Well Number Producer Defined << empty cell >> DWR State Well Number not attributed or not available. Producer defined Not assigned for all wells. https://data.cnra.ca.gov/dataset/well-completion-reports/resource/85b91c71-d8b4-44b0-8fb3-fe1fe5327ca8 USGS_NWIS_URL Link to USGS NWIS URL Producer Defined << empty cell >> USGS_NWIS_URL not available. Producer defined Where it exists. On http://waterdata.usgs.gov/ USGS_GAMAID USGS GAMA-PBP well identification code Producer Defined << empty cell >> WCR has not been linked to a well sampled for the USGS GAMA-PBP Producer defined Well identifier assigned by the USGS Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP). This identifier is used in USGS GAMA-PBP publications. https://webapps.usgs.gov/gama/ SWRCB_DomesticWellNumber CA SWRCB Domestic Well Study Number Producer Defined << empty cell >> WCR has not been linked to a well sampled for the SWRCB Domestic Well program Producer defined Well identifier assigned by the California State Water Resources Control Board's Groundwater Ambient Monitoring and Assessment Program Domestic Well Study program. https://www.waterboards.ca.gov/water_issues/programs/gama/domestic_well.html SWRCB_DDW_PublicSupplyWell CA Public Supply Well Identifier for wells before 2022. The SWRCB changed the Well Identifier codes in 2022. Producer Defined << empty cell >> WCR has not been linked to a SWRCB-DDW public supply well Producer defined The identifier for the California Public Supply Well Number associated with the well, where it is applicable and can be resolved. Contact the State Water Resources Control Board for crosswalk tables between the older and newer Public Water System Information datasets and databases. https://data.ca.gov/dataset/drinking-water-public-water-system-information SWRCB_DDW_PublicSupplyWell_2022 CA Public Supply Well Identifier for wells sampled starting in about 2022. The SWRCB changed the Well Identifier codes in 2022. Not all historical Well Identifier codes before 2022 were issued codes in the new format. Producer Defined << empty cell >> WCR has not been linked to a SWRCB-DDW public supply well Producer defined The identifier for the California Public Supply Well Number associated with the well, where it is applicable, and can be resolved. Not all Well Identifiers have been reviewed at this time. Some discrepancies still exist between what may be indicated on the WCR, the Well Identification Number reported by the Public Supplier, and the Well Identification number in the SWRCB datasets. These data are still being reviewed and updated as appropriate. Please check all numbers for accuracy with the appropriate authoritative data owner. This is typically the Water System. Contact the State Water Resources Control Board for crosswalk tables between the older and newer Public Water System Information datasets and databases or any questions about Public Water System information identifier codes. https://sdwis.waterboards.ca.gov/PDWW/ https://data.ca.gov/dataset/drinking-water-public-water-system-information CASGEM_WellNumber CASGEM Well Number Producer Defined << empty cell >> WCR has not been linked to a CASGEM well Producer defined Since 2009, the California Statewide Groundwater Elevation Monitoring (CASGEM) Program has tracked seasonal and long-term groundwater elevation trends in groundwater basins statewide. https://water.ca.gov/Programs/Groundwater-Management/Groundwater-Elevation-Monitoring--CASGEM CASGEM_Status CASGEM Status Producer Defined << empty cell >> WCR has not been linked to a CASGEM well Producer defined Some entities enter their data voluntarily into the CASGEM database. LocalAgency Local entity, public supply system, or Federal agency identified on the well completion report as the well owner Producer Defined << empty cell >> WCR does not list a local entity, public supply system, or Federal agency as the well owner, or the well owner identify is subject to Personal Identification Information (PII) privacy protection and therefore was not recorded in the USGS internal WCR database. Producer defined Well may be identified as belonging to a local entity, public supply system, or Federal agency. DR_FirstPublished Version of this data release in which the entry was first published Producer Defined Aug_2019 Entry was first published in version 1 of this data release, published in August 2019 Producer defined Jan_2023 Entry was first published in version 2 of this data release, published in January 2023 Producer defined U.S. Geological Survey GS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P9R1V41Q None 20230124 Sylvia V Stork U.S. Geological Survey, California Water Science Center Hydrologist mailing address

6000 J Street Placer Hall

Sacramento CA 95819 United States 916-278-3115 916-278-3070 svstork@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998