20240401 11231800 1.0 ISO19115_3 TRUE <div>This dataset is a collection of water samples collected across the United States from 2000-2023 from the Water Quality Portal (WQP), which integrates publicly available water quality data from the USGS National Water Information System (NWIS) and the EPA Water Quality Exchange (WQX) Data Warehouse. These water quality data records are provided by many federal, state, and tribal organizations and other partners. Because these data are from secondary sources, the U.S. EPA cannot ensure that the information is accurate, current, or complete. Therefore, users should verify the data from the original sources before drawing site specific conclusions. </div><div><div><br /></div><div><b>Components</b></div><div>Data from these components are displayed in separate views within the Freshwater Explorer. Click on the hyperlinks below to learn more about each component. The datasets and analyses displayed in the <i>Freshwater Explorer 2.0 - Nutrients and Ions Data Layer</i> are as follows:</div></div><div><br /></div><div>Data and Metadata</div><div><div style='font-family:&apos; font-size:16px;'> <div style='font-family:inherit;'> <ul> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=66907c2475874280ad86958f449b849a&amp;sublayer=1' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured Total Alkalinity as Calcium Carbonate</a></li> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=66907c2475874280ad86958f449b849a&amp;sublayer=2' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured Ammonia</a></li> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=66907c2475874280ad86958f449b849a&amp;sublayer=3' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured Dissolved Calcium</a></li> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=66907c2475874280ad86958f449b849a&amp;sublayer=4' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured Chlorophyll A</a></li> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=66907c2475874280ad86958f449b849a&amp;sublayer=5' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured Dissolved Chloride</a></li> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=66907c2475874280ad86958f449b849a&amp;sublayer=8' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured Dissolved Sulfate</a></li> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=66907c2475874280ad86958f449b849a&amp;sublayer=6' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured Dissolved Organic Carbon</a></li> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=66907c2475874280ad86958f449b849a&amp;sublayer=7' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured pH</a></li> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=92d20e399e144bb38c0700299f751aee' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured Phosphorus</a></li> <li><a href='https://epa.maps.arcgis.com/home/item.html?id=66907c2475874280ad86958f449b849a&amp;sublayer=9' style='color:#00619b; text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>National Measured Total Nitrogen</a></li> </ul> </div> </div> </div> New Group Layer 2025-01-01T00:00:00 -178.945312 178.945312 75.386696 -56.800878 NutrientsIonsAlkalinityAmmoniaCalciumChlorophyll AChlorideOrganic CarbonpHSulfateTotal NitrogenDissolvedTotalWaterWQPWater Quality PortalNationalCONUSRegionStreamCATNHDNHDPlusMeasuredSummaryFreshwaterFreshwater ExplorerStreamRiverWhartonCormier This dataset is a collection of water samples collected across the United States from 2000-2023 from the Water Quality Portal (WQP), which integrates publicly available water quality data from the USGS National Water Information System (NWIS) and the EPA Water Quality Exchange (WQX) Data Warehouse. These water quality data records are provided by many federal, state, and tribal organizations and other partners. Because these data are from secondary sources, the U.S. EPA cannot ensure that the information is accurate, current, or complete. Therefore, users should verify the data from the original sources before drawing site specific conclusions. Authors: Cormier, S. M., Wharton, C. <p><strong>Freshwater Explorer Data Disclaimer</strong></p> <p>This data is intended for exploratory and discussion purposes. Although statutory provisions and U.S. Environmental Protection Agency (EPA) regulations contain legally binding requirements, these data and related information are not regulatory nor do they change or substitute for any provisions or regulations. The information does not substitute for the Clean Water Act, a National Pollutant Discharge Elimination System permit, or EPA or state regulations applicable to permits; nor is this material a permit or regulation itself. Thus, it does not impose legally binding requirements on EPA, states, tribes, or the regulatory community. This information does not confer legal rights or impose legal obligations on any member of the public. Mention of any trade names, products, or services is not and should not be interpreted as conveying official EPA approval, endorsement, or recommendation.</p> <p>While EPA has used its best efforts to include complete and accurate information in this system, EPA cannot be held responsible for errors or omissions and is not liable for any direct, indirect, or consequential damages resulting from using this secondary information. Some potential sources of error have been assessed by the U.S. EPA resulting in the removal of some samples from the original data sets. However, all sources of potential error cannot be eliminated from the measured data reported in the Freshwater Explorer or the data used to develop predictive models. Therefore, the U.S. EPA cannot fully ensure either the original data or the values calculated from them. Conclusions and assessments drawn from the use of the Freshwater Explorer are the responsibility of the user.</p> <p>Please check sources, scale, accuracy, dates, and other available information. Please confirm that you are using the most recent copy of both data and metadata. Reliance on the information contained in this system by any party cannot be used as a defense in any administrative or judicial proceeding.&nbsp;</p> <p>This dataset may be revised periodically. EPA can revise this dataset without public notice to reflect changes in EPA policy, guidance, and advancements in the field of biological assessments. EPA welcomes public input on this document at any time. Send comments to FreshwaterExplorer@epa.gov, National Center for Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, 26 W. Martin Luther King Dr, Cincinnati, OH 45268.</p> 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 United States Environmental Protection Agency