A5090795278- Groundwater and Isotope Geochemistry
- Groundwater flow and contamination studies
- Water Quality and Resources Studies
- Soil and Water Nutrient Dynamics
- Water Quality and Pollution Assessment
- Arsenic contamination and mitigation
- Fecal contamination and water quality
- Smart Materials for Construction
- Atmospheric and Environmental Gas Dynamics
- Pesticide and Herbicide Environmental Studies
- Hydrology and Watershed Management Studies
- Radioactivity and Radon Measurements
- Geochemistry and Geologic Mapping
- Heavy Metal Exposure and Toxicity
- Hydrocarbon exploration and reservoir analysis
- Mine drainage and remediation techniques
- Soil and Unsaturated Flow
- Fluoride Effects and Removal
- Per- and polyfluoroalkyl substances research
- Flood Risk Assessment and Management
- Radioactive contamination and transfer
- Toxic Organic Pollutants Impact
- Marine and fisheries research
- Karst Systems and Hydrogeology
- Water resources management and optimization
United States Geological Survey
2015-2024
Pennsylvania Water Science Center
2015-2020
Entertainment Industries Council
2017-2019
United States Department of the Interior
2019
Agricultural Research Service
2001
In 2019, 254 samples were collected from five aquifer systems to evaluate perfluoroalkyl and polyfluoroalkyl substance (PFAS) occurrence in groundwater used as a source of drinking water the eastern United States. The analyzed for 24 PFAS, major ions, nutrients, trace elements, dissolved organic carbon (DOC), volatile compounds (VOCs), pharmaceuticals, tritium. Fourteen PFAS detected groundwater, with 60 20% public-supply domestic wells, respectively, containing at least one detection....
This is the first assessment of groundwater from public-supply wells across United States to analyze for >100 pesticide degradates and provide human-health context without benchmarks. Samples 1204 in aquifers representing 70% volume pumped drinking supply were analyzed 109 pesticides (active ingredients) 116 degradates. Among 41% where compounds detected, nearly two-thirds contained compound mixtures three-quarters Atrazine, hexazinone, prometon, tebuthiuron, four atrazine degradates, one...
First posted September 4, 2019 For additional information, contact: Chief Scientist, NAWQAU.S. Geological Survey2201 Sunrise Valley Drive, MS 413Reston, VA 20192-0002 Categorical classification of groundwater age is often used for the assessment and understanding resources. This report presents a tritium-based system conterminous United States based on tritium (3H) thresholds that vary in space time: modern (recharged 1953 or later), if measured value larger than an upper threshold;...
Per- and polyfluoroalkyl substances (PFAS), known colloquially as "forever chemicals," have been associated with adverse human health effects contaminated drinking water supplies across the United States owing to their long-term widespread use. People in may unknowingly be that contains PFAS because of a lack systematic analysis, particularly domestic supplies. We present an extreme gradient-boosting model for predicting occurrence groundwater at depths supply conterminous States. Our...
The national occurrence of 83 pesticide compounds in groundwater the United States and decadal-scale changes concentrations for 35 were assessed 20-year period from 1993-2011. Samples collected 1271 wells 58 nationally distributed well networks. Networks consisted shallow (mostly monitoring) agricultural urban land-use areas deeper domestic public supply) major aquifers mixed areas. Wells sampled once during 1993-2001 2002-2011. Pesticides frequently detected (53% all samples), but seldom...
The presence of contaminants in a source water can constrain its suitability for drinking. quality groundwater used public supply was assessed 25 principal aquifers (PAs) that account 84% pumped the U.S. (89.6 million people on proportional basis). Each PA sampled across lateral extent using an equal-area grid, typically with 60 wells per PA. Samples were analyzed 502 constituents, which 374 had either regulatory or nonregulatory human health benchmark (HHB). Nationally, elevated...
This systematic assessment of occurrence for 85 volatile organic compounds (VOCs) in raw (untreated) groundwater used public supply across the United States (U.S.), which includes 43 not previously monitored by national studies, relates VOC to explanatory factors and assesses detections a human-health context. Samples were collected 2013 through 2019 from 1537 public-supply wells aquifers representing 78% volume pumped drinking-water supply. Laboratory detection limits VOCs generally less...
Decadal-scale changes in groundwater quality were evaluated by the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program. Samples of collected from wells during 1988-2000 - a first sampling event representing decade ending 20th century compared on pair-wise basis to samples same 2001-2010 second beginning 21st century. The data set consists 1,236 56 well networks, major aquifers and urban agricultural land-use areas, with analytical results for chloride, dissolved solids,...
First posted June 20, 2016 Revised November 18, For additional information, contact: Director, Illinois Water Science Center U.S. Geological Survey 405 N Goodwin Urbana, IL 61801 http://il.water.usgs.gov/ Groundwater-quality data were collected from 748 wells as part of the National Water-Quality Assessment Project Program May 2012 through December 2013. The four types well networks: principal aquifer study networks, which assess quality groundwater used for public water supply; land-use...
Water samples from 50 domestic wells located <1 km (proximal) and >1 (distal) shale-gas in upland areas of the Marcellus Shale region were analyzed for chemical, isotopic, groundwater-age tracers. Uplands targeted because natural mixing with brine hydrocarbons deep formations is less common those compared to valleys. CH4-isotope, predrill CH4-concentration, other data indicate that one proximal sample (5% samples) contains thermogenic CH4 (2.6 mg/L) a relatively shallow source (Catskill/Lock...
First posted October 5, 2017 For additional information, contact: Director, Illinois Water Science Center U.S. Geological Survey 405 North Goodwin Avenue Urbana, IL 61801-2347 https://il.water.usgs.gov/ Groundwater-quality data were collected from 559 wells as part of the National Water-Quality Assessment Project Program January through December 2014. The four types well networks: principal aquifer study networks, which are used to assess quality groundwater for public water supply; land-use...
Changes in groundwater quality have been evaluated for more than 2,200 wells 25 Principal Aquifers the United States based on repeated decadal sampling (once every 10 years) from 1988 to 2021. The purpose of this study is identify contaminants with changing concentrations, locations and magnitude those changes, factors driving obstacles interpreting approaches ameliorate obstacles. Sampling was conducted 89 networks 20–30 each that represent various geographic regions, aquifer types land use...
Carbonate aquifers are an important source of water in the United States; however, these can be particularly susceptible to contamination from land surface. The U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program collected samples wells and springs 12 carbonate across country during 1993–2005; water-quality results for 1,042 were available assess factors affecting ground-water quality. These represent a wide range climate, land-use types, degrees confinement, other...
First posted July 3, 2018 For additional information, contact: Director, Central Midwest Water Science CenterU.S. Geological Survey405 N. Goodwin Urbana, IL 61801 Groundwater-quality data were collected from 502 wells as part of the National Water-Quality Assessment Project U.S. Survey Program and are included in this report. Most (500) sampled January through December 2015, 2 them 2013. The five types well networks: principal aquifer study networks, which used to assess quality groundwater...
Abstract Model ground water ages based on chlorofluorocarbons (CFCs) and tritium/helium‐3 ( 3 H/ He) data were obtained from two arrays of nested piezometers located the north limb an anticline in fractured sedimentary rocks Valley Ridge geologic province Pennsylvania. The fracture geometry gently east plunging fold is very regular consists predominately south dipping to subhorizontal bedding‐plane parting striking, steeply axial‐plane spaced cleavage. In area piezometer arrays, which trend...
Groundwater geochemistry, redox process classification, high-frequency physicochemical and hydrologic measurements, climate data were analyzed to identify controls on arsenic (As) concentration changes. was monitored in two public-supply wells (one glacial aquifer one bedrock aquifer), bedrock-aquifer domestic well New Hampshire, USA, from 2014 2018 time scales of As Concentrations other geochemical constituents measured bimonthly. Specific conductance (SC), pH, dissolved oxygen, pumping...