The U.S. Geological Survey (USGS) deployed passive samplers at surface-water and groundwater sites on the Hawaiian Islands of Kauaʻi, Oʻahu, Maui, and Hawaiʻi for several weeks each during 2015–19. The passive samplers were deployed to assess the occurrence of pesticides and pesticide degradates, herein referred to as pesticides, in water at the sites. Some of the passive samplers were also used to assess the occurrence of additional organic contaminants and wastewater indicators in water at the sites. This dataset includes files with chemical results for the passive samplers. The chemical results include masses of pesticides that accumulated in the passive samplers and concentration values that represent the average concentrations of chemicals in water during the deployment of a passive sampler at a site. The data release includes five files. The first file (1_passive-sampler_sites.csv) contains information for each passive sampler that was deployed in water. The second file (2_pesticide_masses_POCIS.csv) contains mass values of pesticides that accumulated in polar-organic-chemical-integrative sampler (POCIS) units of passive samplers. The third file (3_pesticide_concentrations_POCIS.csv) contains concentration values of selected pesticides that accumulated in POCIS units of passive samplers. The fourth file (4_organic_contaminants_SPMD.csv) contains concentration values for organic contaminants that accumulated in semipermeable-membrane-device (SPMD) units of passive samplers. The organic contaminants include organochlorine pesticides, polybrominated diphenyl ether residues, total polychlorinated biphenyl residues, and polycyclic aromatic hydrocarbon residues. The fifth file (5_wastewater_indicators_POCIS.csv) contains results for pharmaceutical compounds and organic waste compounds that accumulated in the POCIS units of the passive samplers. The third file includes water-quality standards and benchmarks established by the State of Hawaiʻi, the U.S. Environmental Protection Agency, and USGS. The USGS National Water Quality Laboratory (NWQL) determined the occurrence of pesticides and pharmaceutical compounds in POCIS units of passive samplers. The USGS Columbia Environmental Research Center (CERC) determined the occurrence of organic contaminants in SPMD units of passive samplers and determined the occurrence of organic waste compounds in POCIS units of the passive samplers.

This dataset contains pesticide-concentration values and other information for water samples and quality-control samples collected at surface-water sites on the Hawaiian Islands of Kauaʻi, Oʻahu, Maui, and Hawaiʻi between November 2016 and June 2019. The water water samples and quality-control samples were collected for a study that assessed pesticides in surface water in Hawaiʻi, as described in a U.S. Geological Survey (USGS) report available at https://doi.org/10.3133/sir20245071. The USGS National Water Quality Laboratory analyzed the water samples for pesticides that consisted of active ingredients in pesticide products and degradates of active ingredients in pesticide products. This dataset has three comma-separated value (csv) files. The first csv file (1_water_samples.csv) contains information for the water samples and quality-control samples. The second csv file (2_pesticide_concentrations_WS.csv) contains pesticide-concentration values for the water samples and also contains water-quality standards and benchmarks established by the USGS, the U.S. Environmental Protection Agency, and the State of Hawaiʻi. The third csv file (3_pesticide_concentrations_QC.csv) contains pesticide-concentration values and other information for quality-control samples. Concentration values in the second file were retrieved from the USGS National Water Information System (https://doi.org/10.5066/F7P55KJN) and are subject to revision. Users can access the concentration values at https://doi.org/10.5066/F7P55KJN and at The Water-Quality Portal (https://doi.org/10.5066/P9QRKUVJ). Information for the sample sites is available at https://doi.org/10.5066/P95XY6ZY and https://doi.org/10.5066/F7P55KJN.

This dataset contains pesticide-concentration values and other information for water samples and quality-control samples collected at surface-water sites on the Hawaiian Islands of Kauaʻi, Oʻahu, Maui, and Hawaiʻi between November 2016 and June 2019. The water water samples and quality-control samples were collected for a study that assessed pesticides in surface water in Hawaiʻi, as described in a U.S. Geological Survey (USGS) report available at https://doi.org/10.3133/sir20245071. The USGS National Water Quality Laboratory analyzed the water samples for pesticides that consisted of active ingredients in pesticide products and degradates of active ingredients in pesticide products. This dataset has three comma-separated value (csv) files. The first csv file (1_water_samples.csv) contains information for the water samples and quality-control samples. The second csv file (2_pesticide_concentrations_WS.csv) contains pesticide-concentration values for the water samples and also contains water-quality standards and benchmarks established by the USGS, the U.S. Environmental Protection Agency, and the State of Hawaiʻi. The third csv file (3_pesticide_concentrations_QC.csv) contains pesticide-concentration values and other information for quality-control samples. Concentration values in the second file were retrieved from the USGS National Water Information System (https://doi.org/10.5066/F7P55KJN) and are subject to revision. Users can access the concentration values at https://doi.org/10.5066/F7P55KJN and at The Water-Quality Portal (https://doi.org/10.5066/P9QRKUVJ). Information for the sample sites is available at https://doi.org/10.5066/P95XY6ZY and https://doi.org/10.5066/F7P55KJN.

This dataset includes information for the sample sites described in the U.S. Geological Survey (USGS) Scientific-Investigations Report 2024-5071, available at https://doi.org/10.3133/sir20245071. The sample sites were at surface-water bodies on the Hawaiian Islands of Kauaʻi, Oʻahu, Maui, and Hawaiʻi. Site information is provided in a comma-separated-value (csv) file and a shapefile. The shapefile contains the same information as the csv file but is formatted for use in a geospatial information system.

This dataset includes pesticide-concentration results for 32 discrete water samples that were collected on the islands of Kauai and Oahu between November 21, 2016 and April 29, 2017. The water samples were collected for the Pesticide-Monitoring Program of Surface Water in the State of Hawaii. This dataset consists of five files: a summary file, a sample-list file, two results files, and this metadata file. The summary file (Summary_of_pesticide_results_for_discrete_samples_Hawaii_Nov2016_Apr2017.pdf) includes maps and a table of the sample sites, graphs that summarize the most frequently detected pesticide compounds in the water samples, and tables that summarize comparisons between (1) concentrations of detected pesticide compounds and (2) water-quality standards, criteria, and benchmarks. The sample-list file [List_of_discrete_samples_Hawaii_Nov2016_Apr2017.csv] contains a list of 32 samples and attributes that describe where, when, and how each sample was collected. The first results file [All_pesticide_results_(ngL)_for_discrete_samples_Hawaii_Nov2016_Apr2017.csv] contains all pesticide-concentration results (in nanograms per liter) for all 32 samples, and these results were obtained from the U.S. Geological Survey (USGS) National Water Information System (NWIS) database (https://doi.org/10.5066/F7P55KJN). The second results file [Pesticide_results_(ngL)_for_detections_only_in_discrete_samples_Hawaii_Nov2016_Apr2017.csv] is a subset of the first results file, and contains pesticides-concentration results for pesticide-compound detections only. For context, both results files include, for each pesticide result, the maximum contaminant level in drinking water, the lowest human-health benchmark considered, and the lowest aquatic-life benchmark considered, if available. This dataset contains summaries and results that were derived from data retrieved from NWIS on January 18, 2018. The data that were retrieved from NWIS are subject to revision, so users should check NWIS (https://doi.org/10.5066/F7P55KJN) for the most current verion of the data.

This dataset includes pesticide-concentration results for 32 discrete water samples that were collected on the islands of Kauai and Oahu between November 21, 2016 and April 29, 2017. The water samples were collected for the Pesticide-Monitoring Program of Surface Water in the State of Hawaii. This dataset consists of five files: a summary file, a sample-list file, two results files, and this metadata file. The summary file (Summary_of_pesticide_results_for_discrete_samples_Hawaii_Nov2016_Apr2017.pdf) includes maps and a table of the sample sites, graphs that summarize the most frequently detected pesticide compounds in the water samples, and tables that summarize comparisons between (1) concentrations of detected pesticide compounds and (2) water-quality standards, criteria, and benchmarks. The sample-list file [List_of_discrete_samples_Hawaii_Nov2016_Apr2017.csv] contains a list of 32 samples and attributes that describe where, when, and how each sample was collected. The first results file [All_pesticide_results_(ngL)_for_discrete_samples_Hawaii_Nov2016_Apr2017.csv] contains all pesticide-concentration results (in nanograms per liter) for all 32 samples, and these results were obtained from the U.S. Geological Survey (USGS) National Water Information System (NWIS) database (https://doi.org/10.5066/F7P55KJN). The second results file [Pesticide_results_(ngL)_for_detections_only_in_discrete_samples_Hawaii_Nov2016_Apr2017.csv] is a subset of the first results file, and contains pesticides-concentration results for pesticide-compound detections only. For context, both results files include, for each pesticide result, the maximum contaminant level in drinking water, the lowest human-health benchmark considered, and the lowest aquatic-life benchmark considered, if available. This dataset contains summaries and results that were derived from data retrieved from NWIS on January 18, 2018. The data that were retrieved from NWIS are subject to revision, so users should check NWIS (https://doi.org/10.5066/F7P55KJN) for the most current verion of the data.

A novel U.S. Geological Survey-developed active water sampler was deployed at Ulatis Creek in Solano County, California for 24 hours from November 15, 2023 to November 16, 2023. Discrete surface water samples were collected at the start and end points of the active water sampler deployment interval for comparison to the active water sampler. Samples from the active water sampler and the discrete surface water samples were analyzed for 183 pesticides dissolved in water and 178 pesticides in suspended sediment at the U.S. Geological Survey Organic Chemistry Research Laboratory in Sacramento, California. Twenty-seven out of 183 pesticide compounds measured in sample extracts were detected in at least one of the grab sample or active sampler dissolved water extracts with concentrations ranging from 0.9 nanograms per liter to 32.2 nanograms per liter. No pesticides were detected in the suspended sediment filtered from the water.

The National Water-Quality Assessment (NAWQA) Program and National Stream Quality Accounting Network (NASQAN) are U.S. Geological Survey (USGS) monitoring programs that measure pesticide concentrations in the Nation’s streams and rivers, herein collectively referred to as streams. The NAWQA Program began monitoring pesticides in 1992 and the NASQAN Program began monitoring pesticides in 1995. The programs were recently merged to form the USGS National Water Quality Network for Rivers and Streams. Water samples are analyzed for pesticides by the USGS National Water Quality Laboratory (NWQL) using methods developed by the NWQL’s Methods Research and Development team. The NWQL extensively used two analytical methods, gas chromatography/mass spectrometry and liquid chromatography/mass spectrometry, to measure pesticides in filtered water samples during 1992–2012 (old method). In October 2012, the monitoring programs began using direct aqueous-injection liquid chromatography tandem mass spectrometry as a new analytical method for pesticides (new method). The change in analytical methods, however, has the potential to inadvertently introduce bias in analysis of datasets that span the change. The data sets provided in this report were used to document performance of the new method in a variety of stream-water matrices and help quantify potential changes in measurement bias or variability that could be attributed to changes in analytical methods (Martin and others, 2016). Users should consult the report by Martin and others (2016) to understand how these data were collected and used. Measured concentrations and calculated recoveries of 281 pesticides and degradates in paired environmental background water samples and matrix spiked water samples collected at 48 stream-water sites from June 11, 2012 to September 6, 2012 are provided in seven tab-delimited ASCII files with relational database (RDB) format header. A tab-delimited ASCII file (DataDictionaryList.txt) listing DataSet attributes and RDB column formats is also included in this data release. Martin, J.D., Norman, J.E., Sandstrom, M.W., and Rose, C.E., 2016, A field study of selected U.S. Geological Survey analytical methods for measuring pesticides in filtered stream water, June-September 2012: U.S. Geological Survey Scientific Investigations Report, 2017-5049

Data in this release were collected and computed to evaluate the occurrence of pesticides in shallow groundwater in the state of Alabama. Additionally, these data support interpretation in Gill (2023) for a cooperative project between the U.S. Geological Survey and the Alabama Department of Agriculture and Industries. During 2009-2020, samples were collected from twenty-four wells located near agricultural land use in Alabama and evaluated for concentrations of agricultural pesticides and pesticide degradates. Most data produced from the sampling effort are available from the publicly accessible USGS National Water Information System (NWIS; U.S. Geological Survey, 2023). For certain pesticide compounds, data were combined from multiple analytical methods to provide a longer period of record in order to evaluate changes in concentrations and occurrence through time. All groundwater quality data used in Gill (2023), including supporting quality assurance datasets, are included in this data release. References: Gill, A.C., 2023, Pesticide occurrence in shallow groundwater near areas of agricultural land use in Alabama, 2009-2020: U.S. Geological Survey Scientific Investigations Report 2023-xxxx, xx p., https://doi.org/xxxx. U.S. Geological Survey, 2023, National Water Information System data available on the World Wide Web (USGS Water Data for the Nation), accessed April 21, 2023, at http://dx.doi.org/10.5066/F7P55KJN.

Data in this release were collected and computed to evaluate the occurrence of pesticides in shallow groundwater in the state of Alabama. Additionally, these data support interpretation in Gill (2023) for a cooperative project between the U.S. Geological Survey and the Alabama Department of Agriculture and Industries. During 2009-2020, samples were collected from twenty-four wells located near agricultural land use in Alabama and evaluated for concentrations of agricultural pesticides and pesticide degradates. Most data produced from the sampling effort are available from the publicly accessible USGS National Water Information System (NWIS; U.S. Geological Survey, 2023). For certain pesticide compounds, data were combined from multiple analytical methods to provide a longer period of record in order to evaluate changes in concentrations and occurrence through time. All groundwater quality data used in Gill (2023), including supporting quality assurance datasets, are included in this data release. References: Gill, A.C., 2023, Pesticide occurrence in shallow groundwater near areas of agricultural land use in Alabama, 2009-2020: U.S. Geological Survey Scientific Investigations Report 2023-xxxx, xx p., https://doi.org/xxxx. U.S. Geological Survey, 2023, National Water Information System data available on the World Wide Web (USGS Water Data for the Nation), accessed April 21, 2023, at http://dx.doi.org/10.5066/F7P55KJN.