This dataset presents the results of passive water sampling conducted at 2 sites in 2013 and 3 sites in 2014 in Lake Mead National Recreational Area. Polar Organic Chemical Integrative Samplers (POCIS) and Semipermeable Membrane Devices (SPMDs) were deployed in Las Vegas Bay and Overton Arm in 2013 and Las Vegas Bay, Boulder Basin, and Overton Arm in 2014. The samplers were analyzed for concentrations of polychlorinated biphenyls (PCBs), organochlorines (DDT-type compounds and their degradates), polybrominated biphenyl ethers (PBDEs), polycyclic aromatic hydrocarbons (PAHs), waste indicators (WW), and yeast estrogen screen (YES) by the U.S. Geological Survey (USGS) at the Columbia Environmental Research Center (CERC) in Columbia, Missouri. Data are presented in a spreadsheet with 5 worksheets containing site information and analyte results.

This dataset presents the results of analysis of aquatic biota tissue samples, collected at 2 sites (Las Vegas Bay and Overton Arm) in 2013 and 2 sites (Las Vegas Bay, Boulder Basin, and Overton Arm) in 2014 in Lake Mead National Recreational Area. The tissue samples were analyzed for concentrations of more than 250 compounds and congeners of polychlorinated biphenyls (PCBs), organochlorine pesticides (DDT and its degradates), wastewater chemicals, and polybrominated diphenyl ethers (PBDEs) by the U.S. Geological Survey (USGS) at the Columbia Environmental Research Center (CERC) in Columbia, Missouri. Analysis methods include low-resolution, high-resolution, and full spectrum mass spectrometry and high-resolution gas chromatography. Data are presented in a spreadsheet with 15 worksheets containing analyte results and quality control information and a summary table suitable for principal component analysis (PCA).

This data release presents chemical and biological results from investigations of water quality, fish endocrine disruption, and emergent insects in the Shenandoah River Watershed (Virginia and West Virginia, USA) conducted during 2014, 2015, and 2016. Multiple sampling campaigns were conducted at sites located throughout the Shenandoah River Watershed (Table 1). The complex inorganic and organic chemical characteristics of river waters and wastewater treatment plant effluents were characterized using 21 separate analytical methods at 7 laboratories (Tables 2, 3, and 4). To assess the relations between water composition and fish endocrine disruption, 21-day mobile laboratory adult fathead minnow exposure experiments with water quality and biological characterization (water collected on day 0, 7, 14, and 21; fish collected on day 0, 7, and 21) were conducted at 4 locations from August 12 to September 1, 2014, 3 locations from May 26 to June 16, 2015, and 5 locations from July 27 to August 17, 2016 (Tables 1 and 5). To assess changes in water chemistry resulting from point and non-point sources along the flow path, targeted stream-reach sampling for water quality characterization was conducted at 14 locations from August 25 to August 27, 2015 (Tables 1 and 6). Temporal variability was assessed by time-series sampling for water quality characterization at 2 locations associated with wild fish collection from April 4 to June 14, 2016 (Tables 1 and 7). Spatial variability across the watershed was assessed by landscape-directed sampling for water-quality characterization with biological assessment at 18 locations from August 9 to August 16, 2016, and 17 locations from October 17 to October 18, 2016 (Tables 1 and 8). Biological results for the 21-day mobile-laboratory adult fathead minnow exposure experiments are presented in Table 9. Biological results for the wild smallmouth bass and white sucker sampling on April 12, 2016 are presented in Table 10. Biological results for the 96-hour larval fathead minnow exposures from July, August, and October 2016 are presented in Table 11. Results for tissue analysis of pesticides and disinfection byproducts in adult fathead minnows collected at day 21 of the August to September 2014 exposure experiments are presented in Table 12. Emergent aquatic insects, terrestrial insects, and spider sampling was conducted at 4 locations from May 21 to May 25, 2015 (Tables 13, 14, and 15) and tissue samples analyzed for pesticides (Tables 16 and 17).

This data release presents chemical and biological results from investigations of water quality, fish endocrine disruption, and emergent insects in the Shenandoah River Watershed (Virginia and West Virginia, USA) conducted during 2014, 2015, and 2016. Multiple sampling campaigns were conducted at sites located throughout the Shenandoah River Watershed (Table 1). The complex inorganic and organic chemical characteristics of river waters and wastewater treatment plant effluents were characterized using 21 separate analytical methods at 7 laboratories (Tables 2, 3, and 4). To assess the relations between water composition and fish endocrine disruption, 21-day mobile laboratory adult fathead minnow exposure experiments with water quality and biological characterization (water collected on day 0, 7, 14, and 21; fish collected on day 0, 7, and 21) were conducted at 4 locations from August 12 to September 1, 2014, 3 locations from May 26 to June 16, 2015, and 5 locations from July 27 to August 17, 2016 (Tables 1 and 5). To assess changes in water chemistry resulting from point and non-point sources along the flow path, targeted stream-reach sampling for water quality characterization was conducted at 14 locations from August 25 to August 27, 2015 (Tables 1 and 6). Temporal variability was assessed by time-series sampling for water quality characterization at 2 locations associated with wild fish collection from April 4 to June 14, 2016 (Tables 1 and 7). Spatial variability across the watershed was assessed by landscape-directed sampling for water-quality characterization with biological assessment at 18 locations from August 9 to August 16, 2016, and 17 locations from October 17 to October 18, 2016 (Tables 1 and 8). Biological results for the 21-day mobile-laboratory adult fathead minnow exposure experiments are presented in Table 9. Biological results for the wild smallmouth bass and white sucker sampling on April 12, 2016 are presented in Table 10. Biological results for the 96-hour larval fathead minnow exposures from July, August, and October 2016 are presented in Table 11. Results for tissue analysis of pesticides and disinfection byproducts in adult fathead minnows collected at day 21 of the August to September 2014 exposure experiments are presented in Table 12. Emergent aquatic insects, terrestrial insects, and spider sampling was conducted at 4 locations from May 21 to May 25, 2015 (Tables 13, 14, and 15) and tissue samples analyzed for pesticides (Tables 16 and 17).

The datafile contains data associated with analytical chemistry, fish gene expression, in vitro bioassays, chemical prioritization, and Attagene data for surface water monitoring and caged fish studies on the South Platte River (Colorado, USA) in 2018 and 2019. This dataset is associated with the following publication: Cavallin, J., J. Beihoffer, B. Blackwell, A. Cole, D. Ekman, R. Hofer, A. Jastrow, J. Kinsey, K. Keteles, E. Maloney, J. Parman, D. Winkelman, and D. Villeneuve. Effects-based monitoring of bioactive compounds associated with municipal wastewater treatment plant effluent discharge to the South Platte River, Colorado, USA. ENVIRONMENTAL POLLUTION. Elsevier Science Ltd, New York, NY, USA, 289: 117928, (2021).

The datafile contains data associated with analytical chemistry, fish gene expression, in vitro bioassays, chemical prioritization, and Attagene data for surface water monitoring and caged fish studies on the South Platte River (Colorado, USA) in 2018 and 2019. This dataset is associated with the following publication: Cavallin, J., J. Beihoffer, B. Blackwell, A. Cole, D. Ekman, R. Hofer, A. Jastrow, J. Kinsey, K. Keteles, E. Maloney, J. Parman, D. Winkelman, and D. Villeneuve. Effects-based monitoring of bioactive compounds associated with municipal wastewater treatment plant effluent discharge to the South Platte River, Colorado, USA. ENVIRONMENTAL POLLUTION. Elsevier Science Ltd, New York, NY, USA, 289: 117928, (2021).

These data represent surface water and bed sediment samples analyzed for a variety of organic compounds. The samples were collected in streams and rivers in the Chesapeake Bay watershed from 2012-2018. Sites were located in Maryland, Pennsylvania, and West Virginia. Surface water samples were collected from 25 sites and analyzed for estrogenicity and an extensive suite of organic contaminants including hormones, pharmaceuticals, wastewater indicators, pesticides, phytoestrogens, and mycotoxins. Bed sediment samples were collected from 20 sites and analyzed for a suite of organic contaminants including hormones, wastewater indicators, pesticides, and organohalogens. Bed sediment was also analyzed for total organic carbon. Data also include replicate and blank quality assurance samples. This U.S. Geological Survey (USGS) data release contains daily-mean streamflow and water-quality data in the Chesapeake Bay watershed ranging from 2012 to 2018 (beginning and end dates may vary).

These data represent surface water and bed sediment samples analyzed for a variety of organic compounds. The samples were collected in streams and rivers in the Chesapeake Bay watershed from 2012-2018. Sites were located in Maryland, Pennsylvania, and West Virginia. Surface water samples were collected from 25 sites and analyzed for estrogenicity and an extensive suite of organic contaminants including hormones, pharmaceuticals, wastewater indicators, pesticides, phytoestrogens, and mycotoxins. Bed sediment samples were collected from 20 sites and analyzed for a suite of organic contaminants including hormones, wastewater indicators, pesticides, and organohalogens. Bed sediment was also analyzed for total organic carbon. Data also include replicate and blank quality assurance samples. This U.S. Geological Survey (USGS) data release contains daily-mean streamflow and water-quality data in the Chesapeake Bay watershed ranging from 2012 to 2018 (beginning and end dates may vary).

Water and sediment was collected to assess the occurrence of contaminants of emerging concern (CECs) in National Park waters of the northern Colorado Plateau, USA. CEC presence in water and sediment is reported for 21 sites in eight U.S. national parks in the northern Colorado Plateau region. From 2012 to 2016, at least one PPCP and/or WWI was detected at most sites on over half of sampling visits, indicating that CECs are not uncommon even in isolated areas. Maximum concentrations in this study were generally below available water quality benchmarks, sediment quality guidelines, and concentrations known to induce biological activity in vitro. C occurrence patterns and similarities between continuous and isolated flow locations suggest that direct contamination from individual visitors may also occur. While the data indicate there is little aquatic health risk associated with CECs at our sites, results demonstrate the ubiquity of CECs on the landscape and a continued need for public outreach concerning resource-use ethics and the potential effects of upstream development. This dataset is associated with the following publication: Weissinger, R., B. Blackwell, K. Keteles, W. Battaglin, and P. Bradley. Bioactive contaminants of emerging concern in national park waters of the northern Colorado plateau, USA. SCIENCE OF THE TOTAL ENVIRONMENT. Elsevier BV, AMSTERDAM, NETHERLANDS, 636: 910-918, (2018).

Water and sediment was collected to assess the occurrence of contaminants of emerging concern (CECs) in National Park waters of the northern Colorado Plateau, USA. CEC presence in water and sediment is reported for 21 sites in eight U.S. national parks in the northern Colorado Plateau region. From 2012 to 2016, at least one PPCP and/or WWI was detected at most sites on over half of sampling visits, indicating that CECs are not uncommon even in isolated areas. Maximum concentrations in this study were generally below available water quality benchmarks, sediment quality guidelines, and concentrations known to induce biological activity in vitro. C occurrence patterns and similarities between continuous and isolated flow locations suggest that direct contamination from individual visitors may also occur. While the data indicate there is little aquatic health risk associated with CECs at our sites, results demonstrate the ubiquity of CECs on the landscape and a continued need for public outreach concerning resource-use ethics and the potential effects of upstream development. This dataset is associated with the following publication: Weissinger, R., B. Blackwell, K. Keteles, W. Battaglin, and P. Bradley. Bioactive contaminants of emerging concern in national park waters of the northern Colorado plateau, USA. SCIENCE OF THE TOTAL ENVIRONMENT. Elsevier BV, AMSTERDAM, NETHERLANDS, 636: 910-918, (2018).