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
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.
Meet Our Team: Patrick Schaefer
As part of our ongoing staff feature series, we are thrilled to profile our Data Services Manager, Patrick Schaefer!
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.
89
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Monitoring Groups
7.9M
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Unique Measurements
27K
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Monitoring Sites
