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...

Research Article| February 01, 1993 Pluton emplacement along an active ductile thrust zone, Piute Mountains, southeastern California: Interaction between deformational and solidification processes K. E. KARLSTROM; KARLSTROM 1University of New Mexico, Albuquerque, Mexico 87131 Search for other works by this author on: GSW Google Scholar C. F. MILLER; MILLER 2Vanderbilt University, Nashville, Tennessee 37235 J. A. KINGSBURY; KINGSBURY L. WOODEN 3U.S. Geological Survey, Menlo Park, California...

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...

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...

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...

Abstract High salinity limits groundwater use in parts of the Mississippi embayment. Machine learning was used to create spatially continuous and three‐dimensional predictions across drinking‐water aquifers Boosted regression tree (BRT) models, a type machine learning, were predict specific conductance (SC) chloride (Cl), total dissolved solids (TDS) calculated from correlation with SC. Explanatory variables for BRT models included well location construction, surficial (e.g., soils land...

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...

About 8 million people rely on groundwater from the Mississippi embayment—Texas coastal uplands aquifer system for drinking water. The River Valley alluvial also provides water domestic use in rural areas but is of primary importance to region as a source irrigation. Irrigation withdrawals this are among largest Nation and play key role economy area, where annual crop sales total more than $7 billion. reliance both aquifers irrigation highlights long-term management sustain availability...

Source water, herein defined as stream water collected at a water-system intake prior to treatment, was sampled nine community systems, ranging in size from system serving about 3,000 people one that serves 2 million people. As many 17 source-water samples were each site over 12-month period between 2002 and 2004 for analysis of 258 anthropogenic organic compounds. Most these compounds are unregulated drinking the analyzed include pesticides selected pesticide degradates, gasoline...

The National Water-Quality Assessment Program of the U.S. Geological Survey began implementing Source Assessments (SWQAs) in 2001 that focus on characterizing quality source water and finished aquifers major rivers used by some larger community systems United States. As SWQA studies, is raw (ambient) collected at supply well before treatment (for groundwater) or from river near intake surface water), has been treated ready to be delivered consumers. Finished-water samples are enters...

Barlow, Jeannie R.B., James A. Kingsbury, and Richard H. Coupe, 2012. Changes in Shallow Groundwater Quality Beneath Recently Urbanized Areas the Memphis, Tennessee Area. Journal of American Water Resources Association (JAWRA) 48(2): 336‐354. DOI: 10.1111/j.1752‐1688.2011.00616.x Abstract: largest city state Tennessee, its surrounding suburbs depend on a confined aquifer, Memphis for drinking water. Concern over potential downward movement water from an overlying shallow aquifer to...

Manganese (Mn) concentrations and the probability of arsenic (As) exceeding drinking-water standard 10 μg/L were predicted in Mississippi River Valley alluvial aquifer (MRVA) using boosted regression trees (BRT). BRT, a type ensemble-tree machine-learning model, created predictor variables that affect Mn As distribution groundwater. These included iron (Fe) specific conductance from previously developed BRT models, groundwater flux age estimates MODFLOW, hydrologic characteristics. The...

The Mississippi embayment-Texas coastal uplands aquifer system is an important source of drinking water, providing about 724 million gallons per day to 8.9 people in Texas, Louisiana, Mississippi, Arkansas, Missouri, Tennessee, Kentucky, Illinois, and Alabama. River Valley alluvial ranks third the Nation for total withdrawals which more than 98 percent used irrigation. From 1994 through 2004, water-quality samples were collected from 169 domestic, monitoring, irrigation, public-supply wells...

First posted July 10, 2018 For additional information, contact: Director, Lower Mississippi-Gulf Water Science Center—TennesseeU.S. Geological Survey640 Grassmere Park, Suite 100Nashville, TN 37211 The hydrogeology, groundwater quality, and potential for hydraulic connection between the Mississippi River Valley alluvial aquifer Memphis in area of Tennessee Authority (TVA) Allen Combined Cycle Fossil Plants southwestern Memphis, Tennessee, were evaluated from September through December 2017....

First posted May 11, 2020 For additional information, contact: Director, Central Midwest Water Science Center U.S. Geological Survey405 North Goodwin Urbana, IL 61801 Environmental groundwater-quality data were collected from 648 wells as part of the National Water-Quality Assessment Project Survey Program and are included in this report. Most (514) sampled January through December 2016, 60 them 2013 74 2014. The seven types well networks: principal aquifer study networks, which used to...

Source water, defined as groundwater collected from a community water system well prior to treatment, was sampled 221 wells during October 2002 July 2005 and analyzed for 258 anthropogenic organic compounds. Most of these compounds are unregulated in drinking include pesticides pesticide degradates, gasoline hydrocarbons, personal-care domestic-use products, solvents. The laboratory analytical methods used the study have detection levels that commonly 100 1,000 times lower than State Federal...

First posted October 2, 2018 For additional information, contact: Director, Lower Mississippi-Gulf Water Science Center—TennesseeU.S. Geological Survey640 Grassmere Park, Suite 100Nashville, TN 37211 The Memphis and Fort Pillow aquifers are the principal sources of water for municipal, industrial, commercial uses in area. About 207 million gallons per day groundwater were withdrawn Shelby County, Tennessee, from both 2010 these uses, with most coming aquifer. U.S. Survey, cooperation City...

First posted March 29, 2021 For additional information, contact: Director, Lower Mississippi-Gulf Water Science Center U.S. Geological Survey640 Grassmere Park Drive Nashville, TN 37211 Groundwater-quality environmental data were collected from 983 wells as part of the National Water-Quality Assessment Project Survey Quality Program and are included in this report. The six types well networks: principal aquifer study networks, which used to assess quality groundwater for public water supply;...