Explore Monitoring Results
One-click visualizations make monitoring results easier to understand.
Great Lakes
DataStream
An open access hub for sharing water data
Our mission is to promote knowledge sharing and collaboration so our waters remain healthy for generations to come
Stories and Announcements
Building a Common Language to Share Water Quality Data: Inside a Global Interoperability Experiment
In 2022, a diverse international coalition of researchers, technology leaders, and implementers came together with a shared goal: make water quality data easier to share, understand, and use across borders, institutions, and systems.
2025: DataStream's Year in Review
We got a lot done in 2025! Thank you to our partners, collaborators, and everyone monitoring their waters and sharing data!
Data Curation for PFAS in Quebec Surface Waters
In the winter of 2024, I had the opportunity to participate in a Data Rescue Internship focused on data curation for per- and polyfluoroalkyl substances (PFAS) in Quebec’s surface waters.
Better Data Means Better Decisions
Communities can drive the data-to-policy cycle. Great Lakes DataStream is designed to support this.
Monitoring Groups
Communities are connected to their waters and best-placed to see changes as they happen.
Open Data
DataStream provides a place to store, share, and compare water monitoring data across watersheds.
Interpretation & Knowledge
Open data advances scientific knowledge, supports collaboration, and fuels innovation.
Policy & Action
Knowledge can be translated into action to protect the health of watersheds on which we all depend.
Great Lakes DataStream at a Glance
DataStream brings water monitoring information together so it’s open, accessible and usable.
91
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Monitoring Groups
8M
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Unique Measurements
27K
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Monitoring Sites
