| Data Service Title | Observation Network Name | WSDL | CreatedDate | Organization | Earliest Start Date | Latest End Date |
| NWIS Daily Values | NWISDV | WSDL | 2015.03.16 | U.S. Geological Survey (USGS) | 1847.10.18 | 2026.01.13 |
| NWIS Ground Water Level | NWISGW | WSDL | 2008.10.30 | U.S. Geological Survey (USGS) | 1801.01.01 | 2025.06.04 |
| NWIS Unit Values | NWISUV | WSDL | 2008.10.30 | U.S. Geological Survey (USGS) | 2025.09.15 | 2026.01.13 |
| Streamflow data from Andrews Forest LTER | AndrewsforestLTER | WSDL | 2019.08.27 | Andrews Forest LTER | 1997.01.26 | 2015.12.13 |
| Curated Data for the Brazilian Rainforest-Savanna Transition Zone | Brazil_UCB | WSDL | 2017.09.06 | Department of Civil and Environmental Engineering at UC Berkeley | 1933.01.01 | 2014.07.31 |
| CALVIN_HHS | CALVIN_HHS | WSDL | 2018.06.22 | Aquatic Habitat, Climate, & Water Analysis Laboratory | 1921.10.31 | 1993.09.30 |
| Corpus Christi Bay Environmental Flows and Hypoxia | CCBEPDAP | WSDL | 2018.05.29 | Harte Research Institute | 1968.09.23 | 2010.11.09 |
| CALIFORNIA DATA EXCHANGE CENTER | CDEC | WSDL | 2021.09.07 | CALIFORNIA DATA EXCHANGE CENTER | 1909.04.13 | 2026.01.13 |
| Cedar River Watershed Forest Snow Observations | CedarRiver | WSDL | 2015.05.13 | University of Washington | 2011.03.17 | 2011.05.25 |
| Clarksburg Study Partnership | Clarksburg_SP | WSDL | 2017.03.17 | Colorado State University | 2014.12.05 | 2017.02.28 |
| Community Collaborative Rain, Hail and Snow Network | CocoRaHs | WSDL | 2017.09.08 | Community Collaborative Rain, Hail and Snow Network | 1998.01.01 | 2026.01.13 |
| Coopercreek Watershed | coopercreek | WSDL | 2021.11.19 | Hamilton County Conservation District | 2019.03.21 | 2025.01.28 |
| Charles River Watershed Association Volunteer Monitoring Program | CRWA | WSDL | 2017.03.29 | Charles River Watershed Association | 1995.06.06 | 2015.12.15 |
| Contributing Organizations Cornell Six Mile Creek Isotopes | CUISO | WSDL | 2018.09.26 | Cornell University | 2017.01.08 | 2018.08.09 |
| Meteorological Monitoring at Duquesne University | DUQWeatherStation | WSDL | 2022.02.03 | Duquesne University - Center for Environmental Research & Education | 2021.11.12 | 2022.01.06 |
| EPA_Lake_Harsha | EPA_Lake_Harsha_Data | WSDL | 2015.10.23 | US EPA | 2009.12.31 | 2011.01.10 |
| Farmington River Watershed Association Water Quality Monitoring Program | FarmRWA | WSDL | 2017.06.08 | Farmington River Watershed Association | 2006.03.30 | 2017.05.10 |
| Florida Coastal Everglades (FCE) LTER | FCELTER | WSDL | 2020.04.14 | Florida Coastal Everglades (FCE) LTER | 1924.02.01 | 2017.12.31 |
| Hydro-metrological and water quality data for Fiji catchments | Fijicatch | WSDL | 2025.03.14 | University of New South Wales, Australia | 2015.01.01 | 2024.10.17 |
| French River Connection Water Quality Monitoring | FRC_WQM | WSDL | 2017.09.07 | French River Connection | 2005.05.22 | 2017.05.19 |
| FSU Hydrowell | FSUHydro | WSDL | 2020.10.14 | FSU Earth Ocean and Atmospheric Science | 2020.10.08 | 2020.10.22 |
| Global Historical Climatology Network | GHCN | WSDL | 2012.04.03 | National Oceanic and Atmospheric Administration (NOAA) | 1763.01.01 | 2025.02.28 |
| Glacial Ridge Project | GlacialRidge | WSDL | 2011.04.25 | University of North Dakota | 2007.10.10 | 2010.09.22 |
| Lake Auburn, Maine, USA. Instrumented Buoy. | GLEON_Auburn | WSDL | 2014.10.25 | Bates College | 2013.07.25 | 2013.11.21 |
| Dorset Environmental Science Centre | GLEON_Dorset | WSDL | 2014.11.06 | Dorset Environmental Science Centre | 2014.07.08 | 2014.10.08 |
| Lake Annie Instrumented Buoy, Venus FL | GLEON_LakeAnnie | WSDL | 2016.03.07 | Archbold Biological Station | 2008.02.14 | 2016.12.31 |
| Lake Sunapee, NH, USA, Instrumented Buoy | GLEON_Sunapee | WSDL | 2014.10.28 | Lake Sunapee Protective Association | 2013.05.15 | 2013.10.16 |
| Global Rivers Observatory | GlobalRiversObservatory | WSDL | 2014.09.12 | The Global Rivers Observatory | 2009.07.28 | 2016.08.15 |
| Gongga Shan | Gongga | WSDL | 2016.11.22 | Alpine Ecosystem Observation and Experiment Station of Mt. Gongga | 2014.12.31 | 2015.11.30 |
| Hassberge catchment long-Term monitoring data | Hassberge | WSDL | 2011.12.12 | Technische University Manchen | 2008.11.07 | 2011.06.05 |
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