Map showing principal aquifers (PAs) and wells that were sampled as part of a Nationwide assessment of the quality of groundwater used for public supply.
Ken Belitz
Ken Belitz is a Research Hydrologist with the USGS Water Resources Mission Area.
Science and Products
New Study Shows High Potential for Groundwater to be Corrosive in One-Half of U.S. States
Groundwater Quality Research
Corrosivity
Public Supply Wells
All about corrosivity
Data for depth of groundwater used for drinking-water supplies in the United States
Data Release for Secondary Hydrogeologic Regions of the Conterminous United States (ver. 2.0, June 2022)
Data for volatile organic compounds in groundwater used for public supply across the United States, 2013-19, and data for associated quality-control samples
Estimated equivalent population using groundwater for public supply domestic use in the conterminous U.S. 2010, hydrogeologic mapping units, and wells used (ver. 2.0, March 2023)
Public supply, self-supplied domestic, irrigation, and thermoelectric water-use data from 5-year compilation datasets from 1985 to 2015 used to assess data variability and uncertainty
Data for Machine Learning Predictions of Nitrate in Groundwater Used for Drinking Supply in the Conterminous United States
Data Release for Evaluation of Six Methods for Correcting Bias in Estimates from Ensemble Tree Machine Learning Regression Models
Inorganic Constituent and Ancillary Data for Evaluation of Lithium in Groundwater in the United States, 1991-2018
Datasets of Groundwater-Quality and Select Quality-Control Data from the National Water-Quality Assessment Project, January 2017 through December 2019
Datasets from Groundwater-Quality and Select Quality-Control Data from the National Water-Quality Assessment Project, January through December 2016, and Previously Unpublished Data from 2013 to 2015
National Multi Order Hydrologic Position (MOHP) Predictor Data for Groundwater and Groundwater-Quality Modeling
Point data for four case studies related to testing of multi-order hydrologic position
Map showing principal aquifers (PAs) and wells that were sampled as part of a Nationwide assessment of the quality of groundwater used for public supply.
Graph of population potentially affected by groundwater contaminants (Belitz and others, 2022). Geogenic constituents affected a larger population compared to anthropogenic constituents.
Graph of population potentially affected by groundwater contaminants (Belitz and others, 2022). Geogenic constituents affected a larger population compared to anthropogenic constituents.
Gross alpha-particle activity and high 226Ra concentrations do not correspond with high 210Po in the Atlantic and Gulf Coastal Plain aquifers of the United States
210Po, which is of human-health concern based on lifetime ingestion cancer risk, is indirectly regulated in drinking water through the U.S. Environmental Protection Agency’s gross alpha-particle activity (GAPA) maximum contaminant level of 15 pCi/L (picocuries per liter). This regulation requires independent measurement of 226Ra for samples exceeding the GAPA screening level of 5 pCi/L. There is n
Predicted uranium and radon concentrations in New Hampshire (USA) groundwater—Using Multi Order Hydrologic Position as predictors
Quality of groundwater used for public supply in the continental United States: A comprehensive assessment
The presence of contaminants in a source water can constrain its suitability for drinking. The quality of groundwater used for public supply was assessed in 25 principal aquifers (PAs) that account for 84% of groundwater pumped for public supply in the U.S. (89.6 million people on a proportional basis). Each PA was sampled across its lateral extent using an equal-area grid, typically with 60 wells
Over a third of groundwater in USA public-supply aquifers is Anthropocene-age and susceptible to surface contamination
Volatile organic compounds in groundwater used for public supply across the United States: Occurrence, explanatory factors, and human-health context
Mapped predictions of manganese and arsenic in an alluvial aquifer using boosted regression trees
Relation between road-salt application and increasing radium concentrations in a low-pH aquifer, southern New Jersey
The Kirkwood–Cohansey aquifer in southern New Jersey is an important source of drinking-water supplies, but the availability of the resource is limited in some areas by high concentrations of radium, a potential carcinogen at elevated concentrations. Radium (226Ra plus 228Ra) concentrations from a network of 25 drinking-water wells showed a statistically significant increase over a decadal time sc
Depth of groundwater used for drinking-water supplies in the United States
Factors affecting uncertainty of public supply, self-supplied domestic, irrigation, and thermoelectric water-use data, 1985–2015—Evaluation of information sources, estimation methods, and data variability
Machine learning predictions of nitrate in groundwater used for drinking supply in the conterminous United States
Predicting regional fluoride concentrations at public and domestic supply depths in basin-fill aquifers of the western United States using a random forest model
Populations using public-supply groundwater in the conterminous U.S. 2010; Identifying the wells, hydrogeologic regions, and hydrogeologic mapping units
Science and Products
New Study Shows High Potential for Groundwater to be Corrosive in One-Half of U.S. States
Groundwater Quality Research
Corrosivity
Public Supply Wells
All about corrosivity
Data for depth of groundwater used for drinking-water supplies in the United States
Data Release for Secondary Hydrogeologic Regions of the Conterminous United States (ver. 2.0, June 2022)
Data for volatile organic compounds in groundwater used for public supply across the United States, 2013-19, and data for associated quality-control samples
Estimated equivalent population using groundwater for public supply domestic use in the conterminous U.S. 2010, hydrogeologic mapping units, and wells used (ver. 2.0, March 2023)
Public supply, self-supplied domestic, irrigation, and thermoelectric water-use data from 5-year compilation datasets from 1985 to 2015 used to assess data variability and uncertainty
Data for Machine Learning Predictions of Nitrate in Groundwater Used for Drinking Supply in the Conterminous United States
Data Release for Evaluation of Six Methods for Correcting Bias in Estimates from Ensemble Tree Machine Learning Regression Models
Inorganic Constituent and Ancillary Data for Evaluation of Lithium in Groundwater in the United States, 1991-2018
Datasets of Groundwater-Quality and Select Quality-Control Data from the National Water-Quality Assessment Project, January 2017 through December 2019
Datasets from Groundwater-Quality and Select Quality-Control Data from the National Water-Quality Assessment Project, January through December 2016, and Previously Unpublished Data from 2013 to 2015
National Multi Order Hydrologic Position (MOHP) Predictor Data for Groundwater and Groundwater-Quality Modeling
Point data for four case studies related to testing of multi-order hydrologic position
Map showing principal aquifers (PAs) and wells that were sampled as part of a Nationwide assessment of the quality of groundwater used for public supply.
Map showing principal aquifers (PAs) and wells that were sampled as part of a Nationwide assessment of the quality of groundwater used for public supply.
Graph of population potentially affected by groundwater contaminants (Belitz and others, 2022). Geogenic constituents affected a larger population compared to anthropogenic constituents.
Graph of population potentially affected by groundwater contaminants (Belitz and others, 2022). Geogenic constituents affected a larger population compared to anthropogenic constituents.
Gross alpha-particle activity and high 226Ra concentrations do not correspond with high 210Po in the Atlantic and Gulf Coastal Plain aquifers of the United States
210Po, which is of human-health concern based on lifetime ingestion cancer risk, is indirectly regulated in drinking water through the U.S. Environmental Protection Agency’s gross alpha-particle activity (GAPA) maximum contaminant level of 15 pCi/L (picocuries per liter). This regulation requires independent measurement of 226Ra for samples exceeding the GAPA screening level of 5 pCi/L. There is n
Predicted uranium and radon concentrations in New Hampshire (USA) groundwater—Using Multi Order Hydrologic Position as predictors
Quality of groundwater used for public supply in the continental United States: A comprehensive assessment
The presence of contaminants in a source water can constrain its suitability for drinking. The quality of groundwater used for public supply was assessed in 25 principal aquifers (PAs) that account for 84% of groundwater pumped for public supply in the U.S. (89.6 million people on a proportional basis). Each PA was sampled across its lateral extent using an equal-area grid, typically with 60 wells
Over a third of groundwater in USA public-supply aquifers is Anthropocene-age and susceptible to surface contamination
Volatile organic compounds in groundwater used for public supply across the United States: Occurrence, explanatory factors, and human-health context
Mapped predictions of manganese and arsenic in an alluvial aquifer using boosted regression trees
Relation between road-salt application and increasing radium concentrations in a low-pH aquifer, southern New Jersey
The Kirkwood–Cohansey aquifer in southern New Jersey is an important source of drinking-water supplies, but the availability of the resource is limited in some areas by high concentrations of radium, a potential carcinogen at elevated concentrations. Radium (226Ra plus 228Ra) concentrations from a network of 25 drinking-water wells showed a statistically significant increase over a decadal time sc