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Lisa A Senior

Lisa Senior is a hydrologist with the USGS Pennsylvania Water Science Center and has been involved with both groundwater and surface-water investigations since 1986, becoming Project Chief for numerous studies in Pennsylvania since 1988.  

Recent Studies

  • Baseline surveys of groundwater quality in and near areas of Marcellus Shale gas development
  • Evaluations of naturally occurring radionuclides, trace elements, and methane in groundwater
  • Effects of land use on groundwater and surface-water quality
  • Modeling of surface-water quality
  • Characterization of fractured-rock hydrogeology of the Newark Basin to support contaminant delineation, monitoring, and remedial management in southeastern Pennsylvania

 

Professional Experience

  • Pennsylvania Water Science Center: 1986 - present

  • Branch of Regional Geophysics, Menlo Park, California: 1981 - 1983

     

Education and Certifications

  • M.S. in Hydrology, University of Arizona, Tucson

  • B.A. in Geology, Middlebury College, Middlebury, Vermont

     

Science and Products

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Screenshot of Chester County (PA) Monitoring Network web app

Chester County, Pennsylvania

USGS has had a cooperative program with Chester County, Pennsylvania, to measure and describe water resources since 1969. Cooperation has been primarily with the Chester County Water Resources Authority, with participation from the Chester County Health Department. This partnership provides Chester County with scientific information for water-resources management.
By
Pennsylvania Water Science Center
link

Chester County, Pennsylvania

USGS has had a cooperative program with Chester County, Pennsylvania, to measure and describe water resources since 1969. Cooperation has been primarily with the Chester County Water Resources Authority, with participation from the Chester County Health Department. This partnership provides Chester County with scientific information for water-resources management.
Learn More
link
Quarry photo with dipping sedimentary rock, SE Penn. Newark Basin

Contaminants in groundwater near former Navy bases in southeastern Pennsylvania

USGS has investigated groundwater flow and contaminant transport in the vicinity of former Navy bases in Bucks and Montgomery Counties, southeastern Pennsylvania, in cooperation with the U.S. Navy. Additional cooperative support for these investigations has been provided by the U.S. Environmental Protection Agency, Pennsylvania Department of Environmental Protection, Bucks and Montgomery counties...
By
Pennsylvania Water Science Center
link

Contaminants in groundwater near former Navy bases in southeastern Pennsylvania

USGS has investigated groundwater flow and contaminant transport in the vicinity of former Navy bases in Bucks and Montgomery Counties, southeastern Pennsylvania, in cooperation with the U.S. Navy. Additional cooperative support for these investigations has been provided by the U.S. Environmental Protection Agency, Pennsylvania Department of Environmental Protection, Bucks and Montgomery counties...
Learn More
link
Collecting blanks for PFAS from freshly decontaminated equipment.

Hydrologic and Water Quality Studies of PFAS in Pennsylvania

USGS is working with federal, state, and local partners to monitor and evaluate perfluoroalkyl and polyfluoroalkyl substances (PFAS) in Pennsylvania's groundwater and surface waters. A recent study sampled tap water in Pennsylvania (and other states) and detected PFAS chemicals in some samples.
By
Pennsylvania Water Science Center
link

Hydrologic and Water Quality Studies of PFAS in Pennsylvania

USGS is working with federal, state, and local partners to monitor and evaluate perfluoroalkyl and polyfluoroalkyl substances (PFAS) in Pennsylvania's groundwater and surface waters. A recent study sampled tap water in Pennsylvania (and other states) and detected PFAS chemicals in some samples.
Learn More
link
Photograph of road cut showing fractured sedimentary rocks

Contaminants in Groundwater near Superfund sites in Pennsylvania

USGS has investigated groundwater flow and contaminant transport in the vicinity of Superfund and other hazardous-waste sites in Pennsylvania, in cooperation with EPA. Additional cooperative support has been provided by the U.S. Department of Defense, National Park Service, Pennsylvania Department of Environmental Protection, Philadelphia, Bucks, Chester, and Montgomery Counties, and local...
By
Pennsylvania Water Science Center
link

Contaminants in Groundwater near Superfund sites in Pennsylvania

USGS has investigated groundwater flow and contaminant transport in the vicinity of Superfund and other hazardous-waste sites in Pennsylvania, in cooperation with EPA. Additional cooperative support has been provided by the U.S. Department of Defense, National Park Service, Pennsylvania Department of Environmental Protection, Philadelphia, Bucks, Chester, and Montgomery Counties, and local...
Learn More
link
Farms, forests and rolling hills in Lycoming County, PA

Regional Synthesis of Groundwater Quality in Domestic Supply Wells in Northeast and North Central Pennsylvania

USGS synthesized groundwater quality measurements in wells to characterize regional chemical characteristics of aquifers used for domestic supply in northeast and north central Pennsylvania.
By
Pennsylvania Water Science Center
link

Regional Synthesis of Groundwater Quality in Domestic Supply Wells in Northeast and North Central Pennsylvania

USGS synthesized groundwater quality measurements in wells to characterize regional chemical characteristics of aquifers used for domestic supply in northeast and north central Pennsylvania.
Learn More
link
Map of baseline groundwater quality assessments in Pennsylvania

Groundwater Quality of Domestic Supply Wells in Pennsylvania

Most rural residents in Pennsylvania use groundwater from domestic supply wells for drinking, cleaning and other purposes. Some groundwater samples have been analyzed for private purposes, but those results generally are not readily available to the public. Many of the publicly available water-quality samples from rural areas were collected more than 30 years ago. Quality-assured groundwater...
By
Pennsylvania Water Science Center
link

Groundwater Quality of Domestic Supply Wells in Pennsylvania

Most rural residents in Pennsylvania use groundwater from domestic supply wells for drinking, cleaning and other purposes. Some groundwater samples have been analyzed for private purposes, but those results generally are not readily available to the public. Many of the publicly available water-quality samples from rural areas were collected more than 30 years ago. Quality-assured groundwater...
Learn More
link
Graphic - Archives

Pre-2013 Bibliography of USGS publications - Chester County, Pennsylvania (Archive)

This is an Archive. A bibliography of USGS publications for Chester County, Pennsylvania, Pre-2013. Pre-2013 Publications available from the USGS Publications Warehouse are on the "Publications" tab. Other publications listed below are not, or in some cases are only partially available at the Publications Warehouse.
By
Pennsylvania Water Science Center
link

Pre-2013 Bibliography of USGS publications - Chester County, Pennsylvania (Archive)

This is an Archive. A bibliography of USGS publications for Chester County, Pennsylvania, Pre-2013. Pre-2013 Publications available from the USGS Publications Warehouse are on the "Publications" tab. Other publications listed below are not, or in some cases are only partially available at the Publications Warehouse.
Learn More
link
Map of potential radon exposure from groundwater and indoor air in Pennsylvania

Evaluation of Radon in Groundwater and Indoor Air in Pennsylvania

Existing groundwater and indoor air radon-222, hereafter referred to as "radon", concentrations were aggregated and evaluated for 16 geologic units throughout the state of Pennsylvania to provide a better understanding of potential human exposure to radon.
By
Pennsylvania Water Science Center
link

Evaluation of Radon in Groundwater and Indoor Air in Pennsylvania

Existing groundwater and indoor air radon-222, hereafter referred to as "radon", concentrations were aggregated and evaluated for 16 geologic units throughout the state of Pennsylvania to provide a better understanding of potential human exposure to radon.
Learn More

Optical measurements for surface water samples collected within the Neshaminy Creek basin during November 2021

Here we report optical data collected as part of a collaborative study between USGS Pennsylvania Water Science Center, Pennsylvania Department of Environmental Protection and Water Mission Area Proxies Project. The optical measurements reported here were collected to aide in the characterization of water sources and mixtures and establish proxies (surrogates) for per- and poly-fluorinated alkyl su
By
California Water Science Center

Altitude of selected beds and inferred faults in boreholes as identified from geophysical logs at Valmont TCE Site, Luzerne County, Pennsylvania

This dataset contains altitudes of selected beds and inferred faults in boreholes within an area of interest determined by the U.S. Environmental Protection Agency (EPA) at the Valmont TCE Superfund site in Luzerne County, Pennsylvania. The selected beds correspond to sections of borehole geophysical logs with elevated natural gamma activity as described in the U.S. Geological Survey (USGS) Open-F
By
Pennsylvania Water Science Center

Data compilation for regional synthesis of chemical characteristics of groundwater used for domestic supply in north-east and north-central Pennsylvania

Groundwater quality data for 472 domestic well-water samples were retrieved from the USGS National Water Information System (NWIS) database and combined with descriptive information on the sampled well locations. The NWIS data for a sample, collected on the selected date, were averaged into a single record (one per well), and rounded according to USGS protocols. For evaluation and reporting, the w
By
Pennsylvania Water Science Center

Water-level data and selected field notes for aquifer-interval-isolation tests at and near the former Naval Air Warfare Center Warminster, Bucks County, Pennsylvania, 2018-19 (ver. 2.0, January 2024)

The U.S. Geological Survey (USGS) conducted aquifer interval isolation (packer) tests of discrete water-bearing zones using straddle packers in 13 wells in Northampton, Warminster, and Warwick Townships and Ivyland Borough, Bucks County, Pennsylvania during 2018-19 to support detailed groundwater investigations at and near the former Naval Air Warfare Center (NAWC) Warminster, where groundwater co
By
Pennsylvania Water Science Center

Compiled data for groundwater levels, groundwater withdrawals by wells and quarries, and point-source discharges to streams in the vicinity of Willow Grove and Warminster, Bucks and Montgomery Counties, Pennsylvania, for selected years during 1999-2017

This USGS Data Release includes hydrologic data compiled for selected years during the period 1990-2017 to support the development and calibration of a numerical groundwater model used to simulate groundwater flow paths at and near former and currently active military bases in Montgomery and Bucks Counties in southeastern Pennsylvania (Goode and Senior, 2020). The hydrologic data compiled for the
By
Pennsylvania Water Science Center

MODFLOW 6 and MODPATH 7 model data sets used to evaluate groundwater flow in the vicinity of Horsham and Warminster, Bucks and Montgomery Counties, Pennsylvania-Preliminary simulations for conditions in 1999, 2010, 2013, 2016, and 2017

In cooperation with the U.S. Navy, USGS developed and calibrated a numerical MODFLOW 6 model to simulate regional groundwater flow under selected conditions during 1999-2017 at and near the former Willow Grove Naval Air Station Joint Reserve Base in Horsham, Montgomery County and the former Naval Air Warfare Center Warminster in Bucks County, Pennsylvania. The model simulations provide information
By
Pennsylvania Water Science Center

Field properties and results of laboratory analysis of groundwater samples collected from 79 wells in Pike County, Pennsylvania, 1982-2015

Water-quality data for groundwater samples collected by the U.S. Geological Survey from 79 wells in Pike County, Pennsylvania, 1982-2015. Data consist of field properties and results of laboratory analysis for concentrations of inorganic constituents, dissolved gases (methane, ethane and propane), radon-222, gross alpha and beta radioactivity, radium-226, and volatile organic compounds (VOCs) and
By
Pennsylvania Water Science Center

Data for regression models developed to estimate fecal coliform concentrations at five stream sites, Chester County, Pennsylvania (2017)

This data release supports the following publication: Senior, Lisa A., 2017, Estimated Fecal Coliform Bacteria Concentrations Using Near Real-Time Water-Quality and Streamflow Data From Five Stream Sites in Chester County, Pennsylvania, 200716: U.S. Geological Survey Scientific-Investigations Report 20175075 (https://doi.org/10.3133/sir20175075). The U.S. Geological Survey (USGS), in cooperation w
By
Pennsylvania Water Science Center
photograph of hillside with ferns, brown leaves, and exposed rock with large pebbles and openings between rock layers
Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania
Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania
photograph of hillside with ferns, brown leaves, and exposed rock with large pebbles and openings between rock layers

Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania

Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania

Exposed Hellam Conglomerate member of the Chickies Quartzite at East Mount Zion Superfund Site, York County, Pennsylvania. (Lisa Senior, USGS)

By
Pennsylvania Water Science Center
photograph of hillside with ferns, brown leaves, and exposed rock with large pebbles and openings between rock layers

Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania

Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania

Exposed Hellam Conglomerate member of the Chickies Quartzite at East Mount Zion Superfund Site, York County, Pennsylvania. (Lisa Senior, USGS)

By
Pennsylvania Water Science Center
photograph of gray rock with embedded pebbles sitting in a bed of green and red leaves and blue flowers
Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania
Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania
photograph of gray rock with embedded pebbles sitting in a bed of green and red leaves and blue flowers

Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania

Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania

Boulder of Hellam Conglomerate member of the Chickies Quartzite at East Mount Zion Superfund Site, York County, Pennsylvania. (Lisa Senior, USGS)

By
Pennsylvania Water Science Center
photograph of gray rock with embedded pebbles sitting in a bed of green and red leaves and blue flowers

Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania

Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania

Boulder of Hellam Conglomerate member of the Chickies Quartzite at East Mount Zion Superfund Site, York County, Pennsylvania. (Lisa Senior, USGS)

By
Pennsylvania Water Science Center
Filter Total Items: 39

Results of 2018–19 water-quality and hydraulic characterization of aquifer intervals using packer tests and preliminary geophysical-log correlations for selected boreholes at and near the former Naval Air Warfare Center Warminster, Bucks County, Pennsylva

The U.S. Geological Survey (USGS) collected data on the vertical distribution of hydraulic head, specific capacity, and water quality using aquifer-interval-isolation tests and other vertical profiling methods in 15 boreholes completed in fractured sedimentary bedrock in Northampton, Warminster, and Warwick Townships, Bucks County, Pennsylvania during 2018–19. This work was done, in cooperation wi
Authors
Lisa A. Senior, Alex R. Fiore
By
Water Resources Mission Area, New Jersey Water Science Center, Pennsylvania Water Science Center

Factors Affecting Groundwater Quality Used for Domestic Supply in Marcellus Shale Region of North-Central and North-East Pennsylvania, USA

Factors affecting groundwater quality used for domestic supply within the Marcellus Shale footprint in north-central and north-east Pennsylvania are identified using a combination of spatial, statistical, and geochemical modeling. Untreated groundwater, sampled during 2011–2017 from 472 domestic wells within the study area, exhibited wide ranges in pH (4.5–9.3), total dissolved solids (TDS, 22–196
Authors
Charles A. Cravotta, Lisa A. Senior, Matthew D. Conlon
By
Water Resources Mission Area, Pennsylvania Water Science Center

Geophysical and video logs of selected wells at and near the former Naval Air Warfare Center Warminster, Bucks County, Pennsylvania, 2017-19

The U.S. Geological Survey (USGS) collected borehole geophysical and video logs in 17 open-hole wells in Northampton, Warminster, and Warwick Townships, Bucks County, Pennsylvania during 2017–19 to support detailed groundwater investigations at and near the former Naval Air Warfare Center (NAWC) Warminster, where groundwater contamination with per- and polyfluoroalkyl substances (PFAS) had become
Authors
Lisa A. Senior, J. Alton Anderson, Philip H. Bird
By
Water Resources Mission Area, Pennsylvania Water Science Center

Hydrogeologic framework, water levels, and selected contaminant concentrations at Valmont TCE Superfund Site, Luzerne County, Pennsylvania, 2020

The Valmont TCE Superfund Site, Luzerne County, Pennsylvania is underlain by fractured and folded sandstones and shales of the Pottsville and Mauch Chunk Formations, which form a fractured-rock aquifer recharged locally by precipitation. Industrial activities at the former Chromatex Plant resulted in trichloroethene (TCE) contamination of groundwater at and near the facility, which was identified

Authors
Lisa A. Senior, Alex R. Fiore, Philip H. Bird
By
Water Resources Mission Area, New Jersey Water Science Center, Pennsylvania Water Science Center

Groundwater withdrawals and regional flow paths at and near Willow Grove and Warminster, Pennsylvania—Data compilation and preliminary simulations for conditions in 1999, 2010, 2013, 2016, and 2017

In 2014, groundwater samples from residential and public supply wells in the vicinity of two former U.S. Navy bases at Willow Grove and Warminster, and an active Air National Guard Station at Horsham, Bucks and Montgomery Counties, Pennsylvania, were found to have concentrations of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), which are per- and polyfluoroalkyl substances (PF
Authors
Daniel J. Goode, Lisa A. Senior
By
Water Resources Mission Area, Pennsylvania Water Science Center

Baseline assessment of groundwater quality in Pike County, Pennsylvania, 2015

The Devonian-age Marcellus Shale and the Ordovician-age Utica Shale, which have the potential for natural gas development, underlie Pike County and neighboring counties in northeastern Pennsylvania. In 2015, the U.S. Geological Survey, in cooperation with the Pike County Conservation District, conducted a study that expanded on a previous more limited 2012 study to assess baseline shallow groundwa
Authors
Lisa A. Senior, Charles A. Cravotta
By
Water Resources Mission Area, Pennsylvania Water Science Center

Estimated fecal coliform bacteria concentrations using near real-time continuous water-quality and streamflow data from five stream sites in Chester County, Pennsylvania, 2007–16

Several streams used for recreational activities, such as fishing, swimming, and boating, in Chester County, Pennsylvania, are known to have periodic elevated concentrations of fecal coliform bacteria, a type of bacteria used to indicate the potential presence of fecally related pathogens that may pose health risks to humans exposed through water contact. The availability of near real-time continu
Authors
Lisa A. Senior
By
Water Resources Mission Area, Pennsylvania Water Science Center

Effects of changes in pumping on regional groundwater-flow paths, 2005 and 2010, and areas contributing recharge to discharging wells, 1990–2010, in the vicinity of North Penn Area 7 Superfund site, Montgomery County, Pennsylvania

A previously developed regional groundwater flow model was used to simulate the effects of changes in pumping rates on groundwater-flow paths and extent of recharge discharging to wells for a contaminated fractured bedrock aquifer in southeastern Pennsylvania. Groundwater in the vicinity of the North Penn Area 7 Superfund site, Montgomery County, Pennsylvania, was found to be contaminated with org
Authors
Lisa A. Senior, Daniel J. Goode
By
Water Resources Mission Area, Pennsylvania Water Science Center

Baseline assessment of groundwater quality in Wayne County, Pennsylvania, 2014

The Devonian-age Marcellus Shale and the Ordovician-age Utica Shale, geologic formations which have potential for natural gas development, underlie Wayne County and neighboring counties in northeastern Pennsylvania. In 2014, the U.S. Geological Survey, in cooperation with the Wayne Conservation District, conducted a study to assess baseline shallow groundwater quality in bedrock aquifers in Wayne
Authors
Lisa A. Senior, Charles A. Cravotta, III, Ronald A. Sloto
By
Water Resources Mission Area, Pennsylvania Water Science Center

A reconnaissance spatial and temporal assessment of methane and inorganic constituents in groundwater in bedrock aquifers, Pike County, Pennsylvania, 2012-13

Pike County in northeastern Pennsylvania is underlain by the Devonian-age Marcellus Shale and other shales, formations that have potential for natural gas development. During 2012–13, the U.S. Geological Survey in cooperation with the Pike County Conservation District conducted a reconnaissance study to assess baseline shallow groundwater quality in bedrock aquifers prior to possible shale-gas dev
Authors
Lisa A. Senior
By
Water Resources Mission Area, Pennsylvania Water Science Center

Investigations of groundwater system and simulation of regional groundwater flow for North Penn Area 7 Superfund site, Montgomery County, Pennsylvania

Groundwater in the vicinity of several industrial facilities in Upper Gwynedd Township and vicinity, Montgomery County, in southeast Pennsylvania has been shown to be contaminated with volatile organic compounds (VOCs), the most common of which is the solvent trichloroethylene (TCE). The 2-square-mile area was placed on the National Priorities List as the North Penn Area 7 Superfund site by the U.
Authors
Lisa A. Senior, Daniel J. Goode
By
Water Resources Mission Area, Pennsylvania Water Science Center

Groundwater-level trends and forecasts, and salinity trends, in the Azraq, Dead Sea, Hammad, Jordan Side Valleys, Yarmouk, and Zarqa groundwater basins, Jordan

Changes in groundwater levels and salinity in six groundwater basins in Jordan were characterized by using linear trends fit to well-monitoring data collected from 1960 to early 2011. On the basis of data for 117 wells, groundwater levels in the six basins were declining, on average about -1 meter per year (m/yr), in 2010. The highest average rate of decline, -1.9 m/yr, occurred in the Jordan Side

Authors
Daniel J. Goode, Lisa A. Senior, Ali Subah, Ayman Jaber
By
Water Resources Mission Area, Pennsylvania Water Science Center, International Programs

Web Tools

Pennsylvania Real-Time Water Quality

Real-time computed concentrations of water-quality constituents such as suspended sediment and fecal coliform bacteria are calculated using ordinary least squares regression models. The results of these models, along with direct water-quality measurements, can be viewed here as time-series graphs, or downloaded as tabular data.

By
Pennsylvania Water Science Center
USGS at the Pennsylvania Groundwater Symposium

USGS at the Pennsylvania Groundwater Symposium

Penn State Extension and the Pennsylvania Department of Environmental Protection, along with numerous other sponsors, hosted the annual Pennsylvania...

Read Article
USGS Characterizes Flow Paths for Movement of PFAS in Groundwater in Southeastern Pennsylvania

USGS Characterizes Flow Paths for Movement of PFAS in Groundwater in Southeastern Pennsylvania

A USGS study characterized groundwater flow paths from possible PFAS sources at three former and active military facilities in southeastern...

Read Article
Baseline Groundwater Quality Studies Find Naturally Occurring Methane in Northeastern Pennsylvania

Baseline Groundwater Quality Studies Find Naturally Occurring Methane in Northeastern Pennsylvania

Well-water tested in Wayne and Pike counties contains low-to-moderate concentrations of naturally occurring methane, according to new studies by the U...

Read Article

Science and Products

link
Screenshot of Chester County (PA) Monitoring Network web app

Chester County, Pennsylvania

USGS has had a cooperative program with Chester County, Pennsylvania, to measure and describe water resources since 1969. Cooperation has been primarily with the Chester County Water Resources Authority, with participation from the Chester County Health Department. This partnership provides Chester County with scientific information for water-resources management.
By
Pennsylvania Water Science Center
link

Chester County, Pennsylvania

USGS has had a cooperative program with Chester County, Pennsylvania, to measure and describe water resources since 1969. Cooperation has been primarily with the Chester County Water Resources Authority, with participation from the Chester County Health Department. This partnership provides Chester County with scientific information for water-resources management.
Learn More
link
Quarry photo with dipping sedimentary rock, SE Penn. Newark Basin

Contaminants in groundwater near former Navy bases in southeastern Pennsylvania

USGS has investigated groundwater flow and contaminant transport in the vicinity of former Navy bases in Bucks and Montgomery Counties, southeastern Pennsylvania, in cooperation with the U.S. Navy. Additional cooperative support for these investigations has been provided by the U.S. Environmental Protection Agency, Pennsylvania Department of Environmental Protection, Bucks and Montgomery counties...
By
Pennsylvania Water Science Center
link

Contaminants in groundwater near former Navy bases in southeastern Pennsylvania

USGS has investigated groundwater flow and contaminant transport in the vicinity of former Navy bases in Bucks and Montgomery Counties, southeastern Pennsylvania, in cooperation with the U.S. Navy. Additional cooperative support for these investigations has been provided by the U.S. Environmental Protection Agency, Pennsylvania Department of Environmental Protection, Bucks and Montgomery counties...
Learn More
link
Collecting blanks for PFAS from freshly decontaminated equipment.

Hydrologic and Water Quality Studies of PFAS in Pennsylvania

USGS is working with federal, state, and local partners to monitor and evaluate perfluoroalkyl and polyfluoroalkyl substances (PFAS) in Pennsylvania's groundwater and surface waters. A recent study sampled tap water in Pennsylvania (and other states) and detected PFAS chemicals in some samples.
By
Pennsylvania Water Science Center
link

Hydrologic and Water Quality Studies of PFAS in Pennsylvania

USGS is working with federal, state, and local partners to monitor and evaluate perfluoroalkyl and polyfluoroalkyl substances (PFAS) in Pennsylvania's groundwater and surface waters. A recent study sampled tap water in Pennsylvania (and other states) and detected PFAS chemicals in some samples.
Learn More
link
Photograph of road cut showing fractured sedimentary rocks

Contaminants in Groundwater near Superfund sites in Pennsylvania

USGS has investigated groundwater flow and contaminant transport in the vicinity of Superfund and other hazardous-waste sites in Pennsylvania, in cooperation with EPA. Additional cooperative support has been provided by the U.S. Department of Defense, National Park Service, Pennsylvania Department of Environmental Protection, Philadelphia, Bucks, Chester, and Montgomery Counties, and local...
By
Pennsylvania Water Science Center
link

Contaminants in Groundwater near Superfund sites in Pennsylvania

USGS has investigated groundwater flow and contaminant transport in the vicinity of Superfund and other hazardous-waste sites in Pennsylvania, in cooperation with EPA. Additional cooperative support has been provided by the U.S. Department of Defense, National Park Service, Pennsylvania Department of Environmental Protection, Philadelphia, Bucks, Chester, and Montgomery Counties, and local...
Learn More
link
Farms, forests and rolling hills in Lycoming County, PA

Regional Synthesis of Groundwater Quality in Domestic Supply Wells in Northeast and North Central Pennsylvania

USGS synthesized groundwater quality measurements in wells to characterize regional chemical characteristics of aquifers used for domestic supply in northeast and north central Pennsylvania.
By
Pennsylvania Water Science Center
link

Regional Synthesis of Groundwater Quality in Domestic Supply Wells in Northeast and North Central Pennsylvania

USGS synthesized groundwater quality measurements in wells to characterize regional chemical characteristics of aquifers used for domestic supply in northeast and north central Pennsylvania.
Learn More
link
Map of baseline groundwater quality assessments in Pennsylvania

Groundwater Quality of Domestic Supply Wells in Pennsylvania

Most rural residents in Pennsylvania use groundwater from domestic supply wells for drinking, cleaning and other purposes. Some groundwater samples have been analyzed for private purposes, but those results generally are not readily available to the public. Many of the publicly available water-quality samples from rural areas were collected more than 30 years ago. Quality-assured groundwater...
By
Pennsylvania Water Science Center
link

Groundwater Quality of Domestic Supply Wells in Pennsylvania

Most rural residents in Pennsylvania use groundwater from domestic supply wells for drinking, cleaning and other purposes. Some groundwater samples have been analyzed for private purposes, but those results generally are not readily available to the public. Many of the publicly available water-quality samples from rural areas were collected more than 30 years ago. Quality-assured groundwater...
Learn More
link
Graphic - Archives

Pre-2013 Bibliography of USGS publications - Chester County, Pennsylvania (Archive)

This is an Archive. A bibliography of USGS publications for Chester County, Pennsylvania, Pre-2013. Pre-2013 Publications available from the USGS Publications Warehouse are on the "Publications" tab. Other publications listed below are not, or in some cases are only partially available at the Publications Warehouse.
By
Pennsylvania Water Science Center
link

Pre-2013 Bibliography of USGS publications - Chester County, Pennsylvania (Archive)

This is an Archive. A bibliography of USGS publications for Chester County, Pennsylvania, Pre-2013. Pre-2013 Publications available from the USGS Publications Warehouse are on the "Publications" tab. Other publications listed below are not, or in some cases are only partially available at the Publications Warehouse.
Learn More
link
Map of potential radon exposure from groundwater and indoor air in Pennsylvania

Evaluation of Radon in Groundwater and Indoor Air in Pennsylvania

Existing groundwater and indoor air radon-222, hereafter referred to as "radon", concentrations were aggregated and evaluated for 16 geologic units throughout the state of Pennsylvania to provide a better understanding of potential human exposure to radon.
By
Pennsylvania Water Science Center
link

Evaluation of Radon in Groundwater and Indoor Air in Pennsylvania

Existing groundwater and indoor air radon-222, hereafter referred to as "radon", concentrations were aggregated and evaluated for 16 geologic units throughout the state of Pennsylvania to provide a better understanding of potential human exposure to radon.
Learn More

Optical measurements for surface water samples collected within the Neshaminy Creek basin during November 2021

Here we report optical data collected as part of a collaborative study between USGS Pennsylvania Water Science Center, Pennsylvania Department of Environmental Protection and Water Mission Area Proxies Project. The optical measurements reported here were collected to aide in the characterization of water sources and mixtures and establish proxies (surrogates) for per- and poly-fluorinated alkyl su
By
California Water Science Center

Altitude of selected beds and inferred faults in boreholes as identified from geophysical logs at Valmont TCE Site, Luzerne County, Pennsylvania

This dataset contains altitudes of selected beds and inferred faults in boreholes within an area of interest determined by the U.S. Environmental Protection Agency (EPA) at the Valmont TCE Superfund site in Luzerne County, Pennsylvania. The selected beds correspond to sections of borehole geophysical logs with elevated natural gamma activity as described in the U.S. Geological Survey (USGS) Open-F
By
Pennsylvania Water Science Center

Data compilation for regional synthesis of chemical characteristics of groundwater used for domestic supply in north-east and north-central Pennsylvania

Groundwater quality data for 472 domestic well-water samples were retrieved from the USGS National Water Information System (NWIS) database and combined with descriptive information on the sampled well locations. The NWIS data for a sample, collected on the selected date, were averaged into a single record (one per well), and rounded according to USGS protocols. For evaluation and reporting, the w
By
Pennsylvania Water Science Center

Water-level data and selected field notes for aquifer-interval-isolation tests at and near the former Naval Air Warfare Center Warminster, Bucks County, Pennsylvania, 2018-19 (ver. 2.0, January 2024)

The U.S. Geological Survey (USGS) conducted aquifer interval isolation (packer) tests of discrete water-bearing zones using straddle packers in 13 wells in Northampton, Warminster, and Warwick Townships and Ivyland Borough, Bucks County, Pennsylvania during 2018-19 to support detailed groundwater investigations at and near the former Naval Air Warfare Center (NAWC) Warminster, where groundwater co
By
Pennsylvania Water Science Center

Compiled data for groundwater levels, groundwater withdrawals by wells and quarries, and point-source discharges to streams in the vicinity of Willow Grove and Warminster, Bucks and Montgomery Counties, Pennsylvania, for selected years during 1999-2017

This USGS Data Release includes hydrologic data compiled for selected years during the period 1990-2017 to support the development and calibration of a numerical groundwater model used to simulate groundwater flow paths at and near former and currently active military bases in Montgomery and Bucks Counties in southeastern Pennsylvania (Goode and Senior, 2020). The hydrologic data compiled for the
By
Pennsylvania Water Science Center

MODFLOW 6 and MODPATH 7 model data sets used to evaluate groundwater flow in the vicinity of Horsham and Warminster, Bucks and Montgomery Counties, Pennsylvania-Preliminary simulations for conditions in 1999, 2010, 2013, 2016, and 2017

In cooperation with the U.S. Navy, USGS developed and calibrated a numerical MODFLOW 6 model to simulate regional groundwater flow under selected conditions during 1999-2017 at and near the former Willow Grove Naval Air Station Joint Reserve Base in Horsham, Montgomery County and the former Naval Air Warfare Center Warminster in Bucks County, Pennsylvania. The model simulations provide information
By
Pennsylvania Water Science Center

Field properties and results of laboratory analysis of groundwater samples collected from 79 wells in Pike County, Pennsylvania, 1982-2015

Water-quality data for groundwater samples collected by the U.S. Geological Survey from 79 wells in Pike County, Pennsylvania, 1982-2015. Data consist of field properties and results of laboratory analysis for concentrations of inorganic constituents, dissolved gases (methane, ethane and propane), radon-222, gross alpha and beta radioactivity, radium-226, and volatile organic compounds (VOCs) and
By
Pennsylvania Water Science Center

Data for regression models developed to estimate fecal coliform concentrations at five stream sites, Chester County, Pennsylvania (2017)

This data release supports the following publication: Senior, Lisa A., 2017, Estimated Fecal Coliform Bacteria Concentrations Using Near Real-Time Water-Quality and Streamflow Data From Five Stream Sites in Chester County, Pennsylvania, 200716: U.S. Geological Survey Scientific-Investigations Report 20175075 (https://doi.org/10.3133/sir20175075). The U.S. Geological Survey (USGS), in cooperation w
By
Pennsylvania Water Science Center
photograph of hillside with ferns, brown leaves, and exposed rock with large pebbles and openings between rock layers
Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania
Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania
photograph of hillside with ferns, brown leaves, and exposed rock with large pebbles and openings between rock layers

Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania

Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania

Exposed Hellam Conglomerate member of the Chickies Quartzite at East Mount Zion Superfund Site, York County, Pennsylvania. (Lisa Senior, USGS)

By
Pennsylvania Water Science Center
photograph of hillside with ferns, brown leaves, and exposed rock with large pebbles and openings between rock layers

Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania

Rock, partings, ferns, hillside, Mt. Zion site, Pennsylvania

Exposed Hellam Conglomerate member of the Chickies Quartzite at East Mount Zion Superfund Site, York County, Pennsylvania. (Lisa Senior, USGS)

By
Pennsylvania Water Science Center
photograph of gray rock with embedded pebbles sitting in a bed of green and red leaves and blue flowers
Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania
Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania
photograph of gray rock with embedded pebbles sitting in a bed of green and red leaves and blue flowers

Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania

Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania

Boulder of Hellam Conglomerate member of the Chickies Quartzite at East Mount Zion Superfund Site, York County, Pennsylvania. (Lisa Senior, USGS)

By
Pennsylvania Water Science Center
photograph of gray rock with embedded pebbles sitting in a bed of green and red leaves and blue flowers

Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania

Quartzite rock, flowering ground cover, East Mount Zion site, York County, Pennsylvania

Boulder of Hellam Conglomerate member of the Chickies Quartzite at East Mount Zion Superfund Site, York County, Pennsylvania. (Lisa Senior, USGS)

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Pennsylvania Water Science Center
Filter Total Items: 39

Results of 2018–19 water-quality and hydraulic characterization of aquifer intervals using packer tests and preliminary geophysical-log correlations for selected boreholes at and near the former Naval Air Warfare Center Warminster, Bucks County, Pennsylva

The U.S. Geological Survey (USGS) collected data on the vertical distribution of hydraulic head, specific capacity, and water quality using aquifer-interval-isolation tests and other vertical profiling methods in 15 boreholes completed in fractured sedimentary bedrock in Northampton, Warminster, and Warwick Townships, Bucks County, Pennsylvania during 2018–19. This work was done, in cooperation wi
Authors
Lisa A. Senior, Alex R. Fiore
By
Water Resources Mission Area, New Jersey Water Science Center, Pennsylvania Water Science Center

Factors Affecting Groundwater Quality Used for Domestic Supply in Marcellus Shale Region of North-Central and North-East Pennsylvania, USA

Factors affecting groundwater quality used for domestic supply within the Marcellus Shale footprint in north-central and north-east Pennsylvania are identified using a combination of spatial, statistical, and geochemical modeling. Untreated groundwater, sampled during 2011–2017 from 472 domestic wells within the study area, exhibited wide ranges in pH (4.5–9.3), total dissolved solids (TDS, 22–196
Authors
Charles A. Cravotta, Lisa A. Senior, Matthew D. Conlon
By
Water Resources Mission Area, Pennsylvania Water Science Center

Geophysical and video logs of selected wells at and near the former Naval Air Warfare Center Warminster, Bucks County, Pennsylvania, 2017-19

The U.S. Geological Survey (USGS) collected borehole geophysical and video logs in 17 open-hole wells in Northampton, Warminster, and Warwick Townships, Bucks County, Pennsylvania during 2017–19 to support detailed groundwater investigations at and near the former Naval Air Warfare Center (NAWC) Warminster, where groundwater contamination with per- and polyfluoroalkyl substances (PFAS) had become
Authors
Lisa A. Senior, J. Alton Anderson, Philip H. Bird
By
Water Resources Mission Area, Pennsylvania Water Science Center

Hydrogeologic framework, water levels, and selected contaminant concentrations at Valmont TCE Superfund Site, Luzerne County, Pennsylvania, 2020

The Valmont TCE Superfund Site, Luzerne County, Pennsylvania is underlain by fractured and folded sandstones and shales of the Pottsville and Mauch Chunk Formations, which form a fractured-rock aquifer recharged locally by precipitation. Industrial activities at the former Chromatex Plant resulted in trichloroethene (TCE) contamination of groundwater at and near the facility, which was identified

Authors
Lisa A. Senior, Alex R. Fiore, Philip H. Bird
By
Water Resources Mission Area, New Jersey Water Science Center, Pennsylvania Water Science Center

Groundwater withdrawals and regional flow paths at and near Willow Grove and Warminster, Pennsylvania—Data compilation and preliminary simulations for conditions in 1999, 2010, 2013, 2016, and 2017

In 2014, groundwater samples from residential and public supply wells in the vicinity of two former U.S. Navy bases at Willow Grove and Warminster, and an active Air National Guard Station at Horsham, Bucks and Montgomery Counties, Pennsylvania, were found to have concentrations of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), which are per- and polyfluoroalkyl substances (PF
Authors
Daniel J. Goode, Lisa A. Senior
By
Water Resources Mission Area, Pennsylvania Water Science Center

Baseline assessment of groundwater quality in Pike County, Pennsylvania, 2015

The Devonian-age Marcellus Shale and the Ordovician-age Utica Shale, which have the potential for natural gas development, underlie Pike County and neighboring counties in northeastern Pennsylvania. In 2015, the U.S. Geological Survey, in cooperation with the Pike County Conservation District, conducted a study that expanded on a previous more limited 2012 study to assess baseline shallow groundwa
Authors
Lisa A. Senior, Charles A. Cravotta
By
Water Resources Mission Area, Pennsylvania Water Science Center

Estimated fecal coliform bacteria concentrations using near real-time continuous water-quality and streamflow data from five stream sites in Chester County, Pennsylvania, 2007–16

Several streams used for recreational activities, such as fishing, swimming, and boating, in Chester County, Pennsylvania, are known to have periodic elevated concentrations of fecal coliform bacteria, a type of bacteria used to indicate the potential presence of fecally related pathogens that may pose health risks to humans exposed through water contact. The availability of near real-time continu
Authors
Lisa A. Senior
By
Water Resources Mission Area, Pennsylvania Water Science Center

Effects of changes in pumping on regional groundwater-flow paths, 2005 and 2010, and areas contributing recharge to discharging wells, 1990–2010, in the vicinity of North Penn Area 7 Superfund site, Montgomery County, Pennsylvania

A previously developed regional groundwater flow model was used to simulate the effects of changes in pumping rates on groundwater-flow paths and extent of recharge discharging to wells for a contaminated fractured bedrock aquifer in southeastern Pennsylvania. Groundwater in the vicinity of the North Penn Area 7 Superfund site, Montgomery County, Pennsylvania, was found to be contaminated with org
Authors
Lisa A. Senior, Daniel J. Goode
By
Water Resources Mission Area, Pennsylvania Water Science Center

Baseline assessment of groundwater quality in Wayne County, Pennsylvania, 2014

The Devonian-age Marcellus Shale and the Ordovician-age Utica Shale, geologic formations which have potential for natural gas development, underlie Wayne County and neighboring counties in northeastern Pennsylvania. In 2014, the U.S. Geological Survey, in cooperation with the Wayne Conservation District, conducted a study to assess baseline shallow groundwater quality in bedrock aquifers in Wayne
Authors
Lisa A. Senior, Charles A. Cravotta, III, Ronald A. Sloto
By
Water Resources Mission Area, Pennsylvania Water Science Center

A reconnaissance spatial and temporal assessment of methane and inorganic constituents in groundwater in bedrock aquifers, Pike County, Pennsylvania, 2012-13

Pike County in northeastern Pennsylvania is underlain by the Devonian-age Marcellus Shale and other shales, formations that have potential for natural gas development. During 2012–13, the U.S. Geological Survey in cooperation with the Pike County Conservation District conducted a reconnaissance study to assess baseline shallow groundwater quality in bedrock aquifers prior to possible shale-gas dev
Authors
Lisa A. Senior
By
Water Resources Mission Area, Pennsylvania Water Science Center

Investigations of groundwater system and simulation of regional groundwater flow for North Penn Area 7 Superfund site, Montgomery County, Pennsylvania

Groundwater in the vicinity of several industrial facilities in Upper Gwynedd Township and vicinity, Montgomery County, in southeast Pennsylvania has been shown to be contaminated with volatile organic compounds (VOCs), the most common of which is the solvent trichloroethylene (TCE). The 2-square-mile area was placed on the National Priorities List as the North Penn Area 7 Superfund site by the U.
Authors
Lisa A. Senior, Daniel J. Goode
By
Water Resources Mission Area, Pennsylvania Water Science Center

Groundwater-level trends and forecasts, and salinity trends, in the Azraq, Dead Sea, Hammad, Jordan Side Valleys, Yarmouk, and Zarqa groundwater basins, Jordan

Changes in groundwater levels and salinity in six groundwater basins in Jordan were characterized by using linear trends fit to well-monitoring data collected from 1960 to early 2011. On the basis of data for 117 wells, groundwater levels in the six basins were declining, on average about -1 meter per year (m/yr), in 2010. The highest average rate of decline, -1.9 m/yr, occurred in the Jordan Side

Authors
Daniel J. Goode, Lisa A. Senior, Ali Subah, Ayman Jaber
By
Water Resources Mission Area, Pennsylvania Water Science Center, International Programs

Web Tools

Pennsylvania Real-Time Water Quality

Real-time computed concentrations of water-quality constituents such as suspended sediment and fecal coliform bacteria are calculated using ordinary least squares regression models. The results of these models, along with direct water-quality measurements, can be viewed here as time-series graphs, or downloaded as tabular data.

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Pennsylvania Water Science Center
USGS at the Pennsylvania Groundwater Symposium

USGS at the Pennsylvania Groundwater Symposium

Penn State Extension and the Pennsylvania Department of Environmental Protection, along with numerous other sponsors, hosted the annual Pennsylvania...

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USGS Characterizes Flow Paths for Movement of PFAS in Groundwater in Southeastern Pennsylvania

USGS Characterizes Flow Paths for Movement of PFAS in Groundwater in Southeastern Pennsylvania

A USGS study characterized groundwater flow paths from possible PFAS sources at three former and active military facilities in southeastern...

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Baseline Groundwater Quality Studies Find Naturally Occurring Methane in Northeastern Pennsylvania

Baseline Groundwater Quality Studies Find Naturally Occurring Methane in Northeastern Pennsylvania

Well-water tested in Wayne and Pike counties contains low-to-moderate concentrations of naturally occurring methane, according to new studies by the U...

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