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 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.

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.

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.

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.

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.

This data release includes all pesticide results from selected batches of water samples analyzed by the U.S Geological Survey National Water Quality Laboratory (NWQL). Samples were analyzed using gas chromatography/mass spectrometry (GCMS) or liquid chromatography/mass spectrometry (LCMS) methods. Eight datasets are included in this data release; 1) all environmental and field quality control (QC) results for 11 pesticide compounds from 70 selected batches of GCMS data from schedules 2001, 2003, 2032, and 2033 (Sandstrom and others, 2001; Zaugg and others, 1995) from May 2001-June 2015, 2) all environmental and field QC results for 10 pesticide compounds from 43 selected batches of LCMS data from schedule 2060 (Furlong and others, 2001) from October 2001-July 2015, 3) All available GCMS set blank results from January 2001-May 2016, 4) All available LCMS set blank results from May 2001-August 2015, 5 and 6) All available blind-blank GCMS and LCMS results from the NWQL from 2004 and from the USGS Branch of Quality systems from 2007 through 2012, and 7 and 8) Blind-spike results from the USGS Organic Blind Sample Project from 2001 through 2016 for the 11 GCMS and 10 LCMS compounds that were investigated in the larger work cited in this metadata record. In addition to the pesticide data originally analyzed and published by the NWQL, a reevaluation of the data in the first two datasets listed in this abstract was performed using current 2017 identification practices. NWQL standard operating procedures have evolved over the 15 years encompassed by this study to provide more specific guidance on the application of identification rules for determining detections. In addition, technology advances were implemented at the NWQL that resulted in improvements in method performance and sample analysis over time. In the data reevaluation process, NWQL reevaluated every result from the 70 GCMS batches and 43 LCMS batches of samples using current 2017 operating procedures and consistently applied criteria for the qualitative identification of pesticides as described in the methods documents (Sandstrom and others, 2001; Zaugg and others, 1995; Furlong and others, 2001). This data release supports the following publication: Medalie, L., Sandstrom, M.W., Toccalino, P.L., Foreman, W.T., ReVello, R.C., Bexfield, L.M., and Riskin, M.L., 2019, Use of set blanks in reporting pesticide results at the U.S. Geological Survey National Water Quality Laboratory, 2001–15: U.S. Geological Survey Scientific Investigations Report 2019–5055, 147 p., https://doi.org/10.3133/sir20195055. References: Furlong, E.T., Anderson, B.D., Werner, S.L., Soliven, P.P., Coffey, L.J., and Burkhardt, M.R., 2001, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory—Determination of pesticides in water by graphitized carbon-based solid-phase extraction and high-performance liquid chromatography/mass spectrometry: U.S. Geological Survey Water-Resources Investigations Report 01–4134, 73 p. [Also available at https://doi.org/10.3133/wri014134.] Sandstrom, M.W., Stroppel, M.E., Foreman, W.T., and Schroeder, M.P., 2001, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory—Determination of moderate-use pesticides and selected degradates in water by C-18 solid-phase extraction and gas chromatography/mass spectrometry: U.S. Geological Survey Water-Resources Investigations Report 01–4098, 70 p. [Also available at https://nwql.usgs.gov/Public/pubs/WRIR/WRIR-01-4098.pdf.] Zaugg, S.D., Sandstrom, M.W., Smith, S.G., and Fehlberg, K.M., 1995, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory—Determination of pesticides in water by C–18 solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring: U.S. Geological Survey Open-File Report 95–181, 49 p. [Also available at https://doi.org/10.3133/ofr95181.]