As part of the Triangle Area Water Supply Monitoring Project, the U.S. Geological Survey conducted a study to evaluate the occurrence and distribution of phytoplankton, taste-and-odor compounds, and cyanotoxin occurrence in four water-supply reservoirs in the Triangle area of North Carolina. This data release contains the associated data described in the Scientific Investigations Report, "Phytoplankton, Taste-and-Odor Compounds, and Cyanotoxin Occurrence in Drinking Water Supply Reservoirs in the Triangle Area of North Carolina". Surface-water samples were collected four times between April and October 2014 at five study sites for laboratory analysis of nutrients, chlorophyll a, major ions, metals, taste and odor compounds, and cyanotoxins for each sample. Field measurements of dissolved oxygen, pH, water temperature, and specific conductance were also conducted at the sites. This data release contains blank sample results, environmental data, replicate sample results, and phytoplankton results. The quality-assurance blank sample dataset contains the analytical results for the blank samples collected during the 2014 study period. The environmental dataset contains surface-water results for phytoplankton, taste-and-odor compounds, and cyanotoxin occurrence. The replicate sample dataset contains the analytical results for the environmental samples paired with their respective replicate collected during the 2014 study period. The phytoplankton dataset contains the analytical results for the phytoplankton data. The remaining field measurement data and chemical constituent results are available from Cain and others (2017).

Data release including concentrations of cyanotoxins and phytoplankton community composition data for water samples collected from the Lake Mattamuskeet National Wildlife Refuge in North Carolina during 2015.

Data release including concentrations of cyanotoxins and phytoplankton community composition data for water samples collected from the Lake Mattamuskeet National Wildlife Refuge in North Carolina during 2015.

This data release contains cyanotoxin concentrations for microcystins, cylindrospermopsins, anatoxins, and saxitoxins assessed using Enzyme-Linked Immunosorbent Assays (ELISA) on 363 samples collected from 82 surface-water sites located in the Cascade Range in Oregon, and eight sites located outside of the Oregon Cascade Range in Washington and California, during 2016-2020. Three sample types were assessed: 1) benthic colonies and mats of cyanobacteria (n=109), 2) plankton net tows (n=90), and 3) Solid Phase Adsorption Toxin Tracking samplers (SPATTs)(n=164).

This data release contains cyanotoxin concentrations for microcystins, cylindrospermopsins, anatoxins, and saxitoxins assessed using Enzyme-Linked Immunosorbent Assays (ELISA) on 363 samples collected from 82 surface-water sites located in the Cascade Range in Oregon, and eight sites located outside of the Oregon Cascade Range in Washington and California, during 2016-2020. Three sample types were assessed: 1) benthic colonies and mats of cyanobacteria (n=109), 2) plankton net tows (n=90), and 3) Solid Phase Adsorption Toxin Tracking samplers (SPATTs)(n=164).

In cooperation with the Tennessee Department of Environment and Conservation (TDEC), the U.S. Geological Survey (USGS) measured cyanobacterial toxin concentrations (i.e., microcystin, anatoxin, cylindrospermopsin, and saxitoxin) and collected water-quality field data at 18 sites in North-central Tennessee from August 2022 to November 2024. Additionally, selected sites also were sampled once for environmental DNA (eDNA) analysis to confirm the presence of toxin producing DNA at the monitoring sites. The goal for the sample data was to better understand the occurrence and distribution of cyanobacterial toxins in various freshwater reservoir types in North-central Tennessee. Sample collection was primarily during the growing season, when harmful algal blooms (HABs) are known to be most active. This data release documents the sites, toxin concentrations, water-quality data, and eDNA data produced from the study.

In cooperation with the Tennessee Wildlife Resources Agency (TWRA) and University of Tennessee Knoxville (UTK), the U.S. Geological survey (USGS) collected cyanobacterial toxin concentrations (i.e., microcystin, anatoxin, cylindrospermopsin, and saxitoxin) and water-quality field data at 4 sites on the Clinch River from November 2020 to December 2023. The goal for the sample data was to better understand the occurrence and distribution of cyanobacterial toxins in a section of the Clinch River. Sample collection was primarily during the growing season, when harmful algal blooms (HABs) are known to be most active. This data release documents the toxin concentrations and water-quality data produced from the study.

This data release presents cyanotoxin and multiparameter water-quality sonde data collected from July-October 2020, at eleven sites in the Salem River, New Jersey. Data-collection sites included seven flowing and four impounded reaches of the main stem Salem River. Solid Phase Adsorption Toxin Tracking (SPATT) samplers were deployed at 11 sampling locations during the study period and retrieved after 1-15 days. Discrete grab samples also were collected at each sampling location during SPATT deployment and retrieval. Physicochemical measurements were collected in-situ with a multiparameter water-quality sonde when the SPATT samplers were deployed and retrieved and include measurements of water temperature, pH, specific conductance, dissolved oxygen concentration, and turbidity. Because of analytical expenses, discrete cyanotoxin samples were analyzed at only 10 of the 11 discrete sampling locations, and toxin results from these analyses informed selection of only 4 of the 11 SPATT sampling locations for additional analyses. SPATT sampler extracts and discrete-grab samples were analyzed for four cyanotoxins (anatoxin-a, cylindrospermopsin, microcystin, saxitoxin) by enzyme-linked immunosorbent assay (ELISA).

Within New Jersey’s Raritan Basin Water Supply Complex, multiple lakes and reservoirs with persistent and recurrent cyanobacterial harmful algal blooms (cyanoHABs) discharge water which ultimately travels downstream in surface water to drinking-water intakes. Cyanobacteria and other water-quality data were collected as part of a collaborative study among multiple agencies, including the U.S. Geological Survey (USGS) New Jersey Water Science Center (NJWSC), New Jersey Water Supply Authority, New Jersey Department of Environmental Protection, and Montclair State University to evaluate the spatial and temporal variability of cyanotoxin occurrence and potential production, persistence, and transport from lacustrine sources to downstream fluvial systems used as a drinking-water source in the Raritan Basin Water Supply Complex, New Jersey. An advanced monitoring strategy using a combination of solid phase adsorption toxin tracking (SPATT) passive samplers, discrete water-quality samples, and continuous monitoring instrumentation, were used to help gain insight on rapidly changing water-quality conditions that affect cyanotoxin production and transport. Eight discrete sampling locations were chosen based upon existing USGS streamflow-gaging stations as well as one site located on Spruce Run Reservoir. Twenty discrete sampling events were conducted across the 8 river sampling locations and 24 sampling events from the reservoir sampling location from August 2020 through August 2021; events occurred twice per month except from December 2020 to April 2021, when samples were collected once per month. Each sampling event was spread over two days, with upstream sites sampled on the first day and downstream sites sampled on the second day. This sampling method mimicked the natural order of streamflow. To meet study objectives, certain types of data were collected, including streamflow, discrete water quality and turbidity samples, water-quality field measurements (water temperature, pH, dissolved oxygen, and specific conductance), nutrients (ammonia, orthophosphate, nitrate plus nitrite, total phosphorus, and total nitrogen), chlorophyll-a, cyanobacterial genes (cyanobacteria 16S cyanobacterial ribosomal RNA, and cyanotoxin synthetase genes for microcystin, saxitoxin, anatoxin-a, and cylindrospermopsin), cyanotoxins (microcystin, anatoxin-a, and cylindrospermopsin), and phytoplankton.

This U.S. Geological Survey (USGS) Data Release provides spatial water-quality data collected from the Caloosahatchee River on June 21-22 and July 20, 2021, south Florida. Geo-referenced measurements of near surface water temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll fluorescence, phycocyanin fluorescence, and fluorescence of dissolved organic matter were recorded at 20 second intervals and nitrate+nitrite as nitrogen was recorded at 5 to 60 second intervals during water-quality surveys in order to create high resolution water-quality maps of the study area.