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Geochemical data for post-fire surface water, streambed sediment, and soils from areas affected by the 2018 Camp Fire, Butte County, California During November 2018, the Camp Fire burned more than 150,000 acres in Butte County, California. The fire was the deadliest and most destructive in California history, destroying more than 18,000 structures and causing at least 85 fatalities. The U.S. Geological Survey sampled surface water in areas affected by the Camp Fire, plus an unburned control site, during two post-fire sampling events, January 21-23, 2019 and February 28 - March 1, 2019. During each of those two sampling events, surface-water samples were collected at 8 stream locations. These 16 water samples were filtered using filters with multiple pore sizes (1.2 µm, 0.8 µm, 0.45 µm, and 0.22 µm) to evaluate colloid transport of trace elements. The filtrates... Categories: Data; Tags: Butte County, California, Environmental Health, Geochemistry, Land Use Change, All tags... USGS Science Data Catalog (SDC), Water Quality, boundaries, fires, runoff, soil chemistry, surface water quality, suspended material (water), Fewer tags Geochemical, grain size, lithological, bathymetric, reconstructed integrated vapor transport, and age model data for Leonard Lake, Mendocino County The data herein are geochemical (from X-Ray fluorescence spectrometry), grain size (percent clay, silt, sand), lithological (loss on ignition data), bathymetric, reconstructed IVT, and radioactive isotopes (14-C, 210-Pb, 226-Ra, and 137-Cs). These data were collected from sediments from Leonard Lake, Mendocino County, California, USA starting in 2014. Together, these data provide evidence for a record of extreme precipitation going back three millennia, showing regional pluvial and drought cycles. Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: California, Climatology, Geography, Hydrology, Limnology, All tags... USGS Science Data Catalog (SDC), biota, ecology, flooding, Fewer tags Slow-moving landslides near the U.S. West Coast mapped from ALOS and ALOS-2 InSAR, 2007-2019 This data set provides a polygon shapefile delineating relatively large, slow-moving (4-17 cm/year in the radar line-of-sight direction) landslides in the continental U.S. western coastal states (California, Oregon, and Washington). The polygons also are provided in a Google Earth .kmz file. Delineated landslides were identified from displacement signals captured by InSAR (Interferometric Synthetic Aperture Radar) interferograms of ALOS PALSAR (Advanced Land Observing Satellite; Phased Array type L-band Synthetic Aperture Radar) images between 2007 and 2011, and ALOS-2 PALSAR-2 images between 2015 and 2019. The ALOS PALSAR images utilized cover the three states entirely; the ALOS-2 PALSAR images utilized cover primarily... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: California, Geomorphology, Oregon, Remote Sensing, USGS Science Data Catalog (SDC), All tags... Washington, landslides, rocks and deposits, uplift, Fewer tags Future Climate and Hydrology from Twenty Localized Constructed Analog (LOCA) Scenarios and the Basin Characterization Model (BCMv8) This data release contains monthly 270-meter resolution Basin Characterization Model (BCMv8) climate and hydrologic variables for Localized Constructed Analog (LOCA; Pierce et al., 2014)-downscaled Global Climate Models (GCMs) for Representative Concentration Pathway (RCP) 4.5 (medium-low emissions) and 8.5 (high emissions) for hydrologic California. The 20 future climate scenarios consist of ten GCMs with RCP 4.5 and 8.5 each: ACCESS 1.0, CanESM2, CCSM4, CESM1-BGC, CMCC-CMS, CNRM-CM5, GFDL-CM3, HadGEM2-CC, HadGEM2-ES, and MIROC5. The LOCA climate scenarios span water years 1950 to 2099 with greenhouse-gas forcings beginning in 2006. The LOCA downscaling method has been shown to produce better estimates of extreme... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: California, Climatology, Hydrology, USGS Science Data Catalog (SDC), United States, All tags... Water Resources, atmospheric and climatic processes, climate change, climatologyMeteorologyAtmosphere, environment, evaporation, geoscientificInformation, hydrology, inlandWaters, mathematical modeling, permeability, precipitation (atmospheric), snow and ice cover, soil moisture, streamflow, surface water (non-marine), transpiration, water budget, water cycle, water resources, watershed management, Fewer tags Total monthly water withdrawals for public supply by 12-digit hydrologic unit in the conterminous United States for 2015 This dataset presents the total estimated monthly public-supply water withdrawal by 12-digit hydrologic unit code (HUC12) in the conterminous United States for 2015. Public-supply water use was estimated by spatially and temporally downscaling available data from each state. The total represents combined groundwater and surface water withdrawals for 83,178 watersheds. Public supply refers to water withdrawn by public and private water suppliers that provide water for cities, towns, rural water districts, mobile-home parks, Native American Indian reservations, and military bases. Public-supply facilities are classified under the Standard Industrial Classification (SIC) 4941 and provide water to at least 25 people... Tags: Alabama, Arizona, Arkansas, California, Colorado, All tags... Connecticut, Conterminous United States, Delaware, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, USGS Science Data Catalog (SDC), Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, community water system, drinking water, groundwater, public supply, surface water, water availability, water budget, water supply and demand, water use, water withdrawal, Fewer tags GIS, supplemental data table, and references for focus areas of potential domestic resources of critical minerals and related commodities in the United States and Puerto Rico (ver. 2.0, April 2024) In response to Executive Order 13817 of December 20, 2017, the U.S. Geological Survey (USGS) coordinated with the Bureau of Land Management (BLM) to identify 36 nonfuel minerals or mineral materials considered critical to the economic and national security of the United States (U.S.) (https://pubs.usgs.gov/of/2018/1021/ofr20181021.pdf). Acquiring information on possible domestic sources of these critical minerals is the rationale for the USGS Earth Mapping Resources Initiative (Earth MRI). The program, which partners the USGS with State Geological Surveys, Federal agencies, and the private sector, aims to collect new geological, geophysical, and topographic (lidar) data in key areas of the U.S. to stimulate mineral... Categories: Data, Data Release - Revised; Tags: Alabama, Alaska, Arizona, Arkansas, California, All tags... Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, USGS Science Data Catalog (SDC), United States, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, aluminum, antimony, arsenic, barite, beryllium, bismuth, cesium, chromium, cobalt, critical minerals, economic geology, fluorspar, gallium, geoscientificInformation, geospatial datasets, germanium, graphite, hafnium, indium, lithium, magnesium, manganese, mineral deposits, nickel, niobium, platinum group elements (PGE), potash, rare earth elements (REE), rhenium, rubidium, scandium, strontium, tantalum, tellurium, tin, titanium, tungsten, uranium, vanadium, zinc, zirconium, Fewer tags Geospatial mapping products derived from 2018, 2020, and 2022 NAIP aerial imagery for the Scotts Creek Watershed, Lake County, CA The USGS, in cooperation with the U.S. Bureau of Land Management (BLM), created a series of geospatial mapping products of the Scotts Creek Watershed in Lake County, California, using National Agriculture Imagery Program (NAIP) imagery from 2018, 2020 and 2022 and Open Street Map (OSM) from 2019. The imagery was downloaded from United States Department of Agriculture (USDA) - Natural Resources Conservation Service (NRCS) Geospatial Data Gateway (https://datagateway.nrcs.usda.gov/) and Geofabrik GmbH - Open Street Map (https://www.geofabrik.de/geofabrik/openstreetmap.html), respectively. The imagery was classified using Random Forest (RF) Modeling to produce land cover maps with three main classifications - bare,... Tags: California, Lake County, Land Use Change, Remote Sensing, Scotts Creek, All tags... South Cow Mountain, USGS Science Data Catalog (SDC), Water Resources, aerial photography, elevation, freshwater ecosystems, geoscientificInformation, inlandWaters, land use and land cover, modeling, natural resource management, remote sensing, river systems, Fewer tags Chronic Wasting Disease distribution in the United States by state and county (ver. 2.0, April 2024) Chronic Wasting Disease (CWD) is a fatal, contagious, neuro-degenerative disease affecting multiple members of the Family Cervidae. First detected in 1967, the disease has, as of April 2024, been documented in free-ranging and/or captive cervid populations in 33 states, five Canadian provinces, the Republic of South Korea, Norway, Sweden, and Finland. The data provided here contains information on the known, available, documented distribution of CWD in the United States that is current as of the publication date. The USGS National Wildlife Health Center (NWHC) tracks changes to the known distribution of CWD in the form of a map (available on the NWHC website at https://www.usgs.gov/centers/nwhc/science/expanding-distribution-chronic-wasting-disease.... Categories: Data, Data Release - Revised; Types: Citation; Tags: Alabama, Alaska, American Samoa, Arizona, Arkansas, All tags... CWD, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Guam, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Northern Mariana Islands, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, U.S. Virgin Islands, USGS Science Data Catalog (SDC), Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, cervids, chronic wasting disease, deer, elk, map, moose, morbidity, wildlife, wildlife health, Fewer tags Data release for tracking rates of post-fire conifer regeneration distinct from deciduous vegetation recovery across the western U.S. Post-fire shifts in vegetation composition will have broad ecological impacts. However, information characterizing post-fire recovery patterns and their drivers are lacking over large spatial extents. In this analysis we used Landsat imagery collected when snow cover (SCS) was present, in combination with growing season (GS) imagery, to distinguish evergreen vegetation from deciduous vegetation. We sought to (1) characterize patterns in the rate of post-fire, dual season Normalized Difference Vegetation Index (NDVI) across the region, (2) relate remotely sensed patterns to field-measured patterns of re-vegetation, and (3) identify seasonally-specific drivers of post-fire rates of NDVI recovery. Rates of post-fire... Tags: Arizona, California, Climatology, Colorado, Douglas fir, All tags... Ecology, Engelmann spruce, Forestry, Idaho, Landsat, Lodgepole pine, Montana, NDVI, Nevada, Oregon, Pinyon pine, Remote Sensing, Rocky Mountains, Sierra Nevada Mountains, USGS Science Data Catalog (SDC), Utah, Washington, Wyoming, forest fire, recovery, resiliency, succession, wildfire, Fewer tags Coastal Storm Modeling System (CoSMoS) The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current conditions and future SLR scenarios, and in many locations, there are additional products for long-term shoreline change, cliff retreat, and groundwater hazards.  Resulting projections for future climate scenarios (sea-level rise and storms) provide emergency responders and coastal planners with critical storm-hazards information that can be used to increase public safety and mitigate physical damages to reduce risk, and more effectively manage and allocate resources to increase resilience in response to a changing climate... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Beaches, CMG, CMGP, California, Cliffs, All tags... Climate Change, Coastal and Marine Geology, Erosion, Extreme Weather, Floods, Hazards Planning, Ocean Waves, Ocean Winds, PCMSC, Pacific Coastal and Marine Science Center, Sea-Level Rise, Storm Surge, Storms, U.S. Geological Survey, USGS, environmental justice, Fewer tags MODFLOW-OWHM Used to Characterize the Groundwater Flow System of the Central Valley A three-dimensional groundwater flow model of the Central Valley in California was developed to aid water managers in understanding how water moves through the aquifer system, to predict water-supply scenarios, and to address issues related to subsidence. The USGS California Water Science Center made a detailed assessment of groundwater availability of the Central Valley aquifer system, which includes: (1) the status of groundwater resources; (2) how these resources have changed over time, particularly related to subsidence; and (3) tools to assess system responses to stresses from future human uses and climate variability and change. This effort builds on previous investigations, such as the USGS Central Valley... Categories: Data; Tags: California, Central Valley, Corcoran Clay, Sacramento Valley, San Joaquin Basin, All tags... San Joaquin Valley, Tulare Basin, USGS Science Data Catalog (SDC), Water Resources, environment, groundwater and surface-water interaction, groundwater flow modeling, groundwater level, land subsidence, Fewer tags Landslides triggered by the January 10th, 2005 storm in the vicinity of La Conchita, Ventura County, California, USA The area surrounding La Conchita, California (CA), USA experienced significant landslides and debris flows following a storm on January 10th, 2005, including a deadly deep-seated landslide that destroyed 13 houses and caused 10 fatalities (Jibson, 2006). This data release documents the locations of shallow landslide source locations in the vicinity of the deadly 2005 La Conchita landslide. Landslide locations were mapped as points using post-event imagery available in Google Earth. The data release includes: 1) .csv file containing the point locations of shallow hillslope landslides, 2) .zip file containing shapefile (.shp) of the mapped study area. References: Jibson, R. W. (2006). The 2005 La Conchita, California,... Categories: Data; Tags: California, Geomorphology, La Conchita, USGS Science Data Catalog (SDC), United States, All tags... Ventura County, debris flow, geomorphology, geoscientificInformation, landslide inventory, landslides, Fewer tags Exotic annual grass (EAG) phenology estimates in the western U.S. rangelands based on 30-m HLS NDVI (ver. 2.0, April 2024) Phenological dynamics of terrestrial ecosystems reflect the response of the Earth's vegetation canopy to changes in climate and hydrology and are thus important to monitor operationally. The Exotic Annual Grass (EAG) phenology in the western U.S. rangeland based on 30m near seamless Harmonized Landsat and Sentinel-2 (HLS) Normalized Difference Vegetation Index (NDVI) weekly composites between 2016 and 2021 (Dahal et al., 2022) were processed using these 3 methods: (1) NDVI threshold-based method, (2) manual phenological metrics, and (3) modeling and mapping. The EAG phenology model produced two metrics identifying the sustainable growth characteristics of 16 EAG species throughout level III Commission for Environmental... Tags: Amplitude (AMP), Arizona, California, Colorado, Drought, All tags... Duration (DUR), End of Season NDVI (EOSN), End of Season Time (EOST), Great Basin, Harmonized Landsat Sentinel, Idaho, Kansas, Maximum NDVI (MAXN), Montana, Nebraska, Nevada, New Mexico, Normalized Difference Vegetation Index (NDVI), North Dakota, Oklahoma, Oregon, Phenology, Remote Sensing, South Dakota, Start of Season NDVI (SOSN), Start of Season Time (SOST), Texas, Time Integrated NDVI (TIN), Time of Maximum (MAXT), USGS Science Data Catalog (SDC), United States, Utah, Vegetation Phenology, Washington, Western United States, Wyoming, Fewer tags Estuarine vegetated wetland change scenarios for estuaries in the conterminous United States, 1996–2019 This data release contains land cover-derived statistics regarding estuarine vegetated wetland area change within estuary drainage areas along the conterminous U.S. This dataset includes net change in estuarine vegetated wetland area based on National Oceanic and Atmospheric Administration's (NOAA) Coastal Change Assessment Program (C-CAP) 1996 and 2016 land cover data. Net change was assessed between estuarine vegetated wetlands (i.e., estuarine marshes, mangroves, non-mangrove estuarine woody wetlands, and salt pannes, depending on vegetation coverage and type) and the following other landcover classes: 1) water; 2) unconsolidated shore; 3) freshwater woody wetlands; 4) freshwater marsh; 5) upland; and 6) agriculture.... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Alabama, Atlantic, California, Connecticut, Delaware, All tags... District of Columbia, Ecology, Emergent Wetland, Estuarine Coastal, Florida, Forested Wetland, Geomorphology, Georgia, Gulf of Mexico, Land Use Change, Louisiana, Maine, Maryland, Massachusetts, Mississippi, New Hampshire, New Jersey, New York, North Carolina, Oregon, Pacific, Pennsylvania, Remote Sensing, Rhode Island, South Carolina, Texas, USGS Science Data Catalog (SDC), Virginia, Washington, biota, coastal processes, effects of climate change, environment, imageryBaseMapsEarthCover, land use and land cover, marsh ecosystems, remote sensing, sea-level rise, wetland ecosystems, Fewer tags National Volcanic Threat Layer There are 161 active volcanoes in the U.S. and its territories. These volcanoes pose differing degrees of risk to people and infrastructure because of differences in their eruptive styles and geographic locations. This layer shows the areas near volcanic vents that could be affected by proximal volcano hazards, including ballistics (airborne rocks from explosions), pyroclastic density currents, lava flows, debris avalanches, lahars (mudflows), and heavy ashfall, as well as areas downstream that could be affected by distal lahars (see the USGS Volcano Hazards Program Glossary for descriptions of these processes: https://www.usgs.gov/glossary/volcano-hazards-program-glossary). These areas are labelled with their corresponding... Tags: Alaska, America Samoa, Arizona, California, Colorado, All tags... Hawaii, Idaho, Nevada, New Mexico, Northern Mariana Islands, Oregon, USGS Science Data Catalog (SDC), United States, Utah, Volcanology, Washington, geoscientificInformation, risk assessment, volcanic activity, volcanology, Fewer tags The major, minor, and trace element geochemistry of mineral scales from The Geysers geothermal field, California, USA This data release provides quantitative whole rock geochemical results from The Geysers vapor-dominated geothermal field in California. The concentrations of major elements are reported in oxide weight percent by wavelength dispersive x-ray fluorescence (WDXRF), the concentrations for sixty elements are reported in elemental weight percent (pct) or parts per million (ppm) from inductively coupled plasma-optical emission spectrometry-mass spectrometry ICP-OES-MS analysis, mercury is reported in ppm by cold vapor atomic absorption spectrometry (CVAAS), and ammonium in ppm from automated colorimetry analysis. The analyses show significant enrichment of volatile elements and elements such as sulfur, boron, arsenic,... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, GGGSC, Geochemistry, Geology, Geophysics, and Geochemistry Science Center, Lake County, All tags... MRP, Mineral Resources Program, Sonoma County, The Geysers, USGS Science Data Catalog (SDC), United States, ammonium, arsenic, boron, chemical analysis, cobalt, cold vapor atomic absorption spectrometry (CVAAS), copper, geochemistry, geoscientificInformation, geothermal field, iron, lead, mercury, mineral resources, mineral scales, mineralogy, nickel, sulfur, wavelength dispersive X-ray fluorescence (WDXRF), zinc, Fewer tags Semiquantitative mineralogy results from powder X-ray diffraction (XRD) analyses of mineral scales from The Geysers geothermal field, California, USA This data release provides semiquantitative mineralogy results from X-ray diffraction (XRD) analyses of mineral scales from The Geysers vapor-dominated geothermal field in California. The mineral species and their abundances are reported in weight percent and values have been normalized to total 100 percent for each sample. The X-ray diffraction results show that the mineral samples from the wellheads are primarily composed of ammonium (NH4+) sulfate minerals and sassolite B(OH)3, whereas sulfide minerals such as cinnabar and pyrite are the most abundant minerals observed in the power plants. Mineral scales vary along the steam flow path, from the wellhead to power plants. Relatively abundant iron oxide and iron... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, GGGSC, Geochemistry, Geology, Geophysics, and Geochemistry Science Center, Lake County, All tags... MRP, Mineral Resources Program, Sonoma County, The Geysers, USGS Science Data Catalog (SDC), United States, XRD, geoscientificInformation, geothermal field, geothermal resources, mineral scales, mineralogy, semiquantitative mineralogy, x-ray diffraction, Fewer tags Stability testing results for stock solutions to standardize calibration of field fluorescence sensors Optical sensors measuring fluorescence of dissolved organic matter (fDOM) are increasingly used in water quality studies because they provide proxy measurements for a variety of contaminants and constituents of concern including metals and wastewater effluent. Similarly, sensors measuring fluorescence of chlorophyll (fChl) and phycocyanin (fPC) have gained popularity to measure phytoplankton concentration, biomass, and even primary productivity. Optical sensors require calibration using a calibration standard solution which is diluted from a working stock solution. However, preparation of stock solutions is challenging because they are difficult to prepare accurately, need to be prepared in a laboratory setting,... Categories: Data; Tags: California, California Water Science Center, Organic Matter Research Lab, Sacramento, USGS Science Data Catalog (SDC), All tags... Water Quality, algae, calibration, chlorophyll, environment, fDOM, fluorescence, optical sensor, organic matter, phycocyanin, standard solution, water quality, Fewer tags Airborne Geophysical Survey Inventory of the Conterminous United States, Alaska, Hawaii, and Puerto Rico (ver. 5.0, April 2024) This data release is a compilation of the locations of airborne geophysical surveys in the United States. The inventory documents public airborne geophysical surveys primarily flown by or contracted by the USGS from 1943 to present. In addition, surveys from the State of Alaska, Department of Natural Resources, Division of Geological and Geophysical Surveys (DGGS): Airborne GeophysWeb, the Bureau of Land Management, the Department of Energy and other state agencies have also been included. The surveys have contributed to studies under USGS programs including Water, Geologic Mapping, Minerals, Energy, Environmental Health, Ecosystems, Hazards, and Climate. This dataset contains locations for known and inventoried... Categories: Data, Data Release - Revised; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Alabama, Alaska, Arizona, Arkansas, California, All tags... Colorado, Connecticut, Delaware, District of Columbia, Earth MRI, Florida, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Geophysics, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, MRP, Maine, Maryland, Massachusetts, Michigan, Mineral Resources Program, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, USGS Science Data Catalog (SDC), Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, aeromagnetic surveying, aeroradiometric surveying, electromagnetic surveying, frequency-domain, geophysical, geophysics, geophysics, geoscientificInformation, geospatial datasets, gravitational field (earth), resistivity, time-domain, Fewer tags Groundwater-Quality Time-Series Analyses and Potential Explanatory Factors of Drought-Response Patterns at Public-Supply Wells, San Joaquin Valley, California, 2000-2022 This data release documents time-series analyses of aqueous-chemistry data from public-supply wells (PSWs) and associated potential explanatory factors to characterize responses of groundwater quality to drought and recovery periods in California’s San Joaquin Valley (SJV) during 2000-2022. Annual median nitrate values were computed for PSWs throughout the SJV during the period of study. Median annual nitrate values were calculated at all PSWs with available data in the SJV, resulting in a total of 698 PSWs with complete annual records after single-year linear gap imputation. A total of 237 of these records were classified as “low variance” because they contained proportions of identical values exceeding 80 percent... Tags: California, Environmental Health, Geochemistry, Hydrology, San Joaquin, All tags... Tulare, USGS Science Data Catalog (SDC), Water Quality, arsenic, cluster analysis, droughts, environment, fluoride, geoscientificInformation, groundwater quality, health, inlandWaters, nitrate, time series analysis, time series datasets, total dissolved solids, Fewer tags 1 2 »