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Collect, share, and explore community water science data

We’re a non-profit on a mission to make water science accessible! Our free, open-access platform, testing equipment, and training resources help communities collect, organize, and share water quality data.

Map showing community water quality sites

Browse all of the data!

Explore community-collected water quality data on our public map. Search by location, dataset, or organization, then view sites and trends or download what you need.

Explore the map

Set up your own dataset

You can easily add your organization and dataset, customize your form fields using Water Rangers’ equipment plus your own, and invite your volunteer monitors to contribute. It's free for communities to use.

We've prepared a walkthrough on YouTube to understand the basics.

Built for sharing

We make your water quality data easy to understand with simple visualizations. Want to do more? We follow open data standards so your work can be compared, understood, and acted on. You can download datasets or connect to our open API to pull data into your own projects.

Learn about sharing data

357

organizations
Go to organizations
533

datasets
9,273

locations
76.4K

observations
645.4K

datapoints
Browse datapoints by location
3,812

data contributors

Popular testing spots

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Recently sampled and photographed

Most active datasets

Active this week

Lea Guardians

Part of the organization: Thames21

27K datapoints in 2,659 observations at 131 locations. 19 new observations this week.
Mississippi Water Stewards

Part of the organization: Mississippi State University

41.6K datapoints in 2,766 observations at 121 locations. 8 new observations this week.
Mississippi Lakes Association

Part of the organization: Mississippi Lakes Association

9,117 datapoints in 774 observations at 70 locations. 8 new observations this week.
Winter Chloride Watch

Part of the organization: National Great Rivers

44.1K datapoints in 8,086 observations at 468 locations. 6 new observations this week.
Upper St. Lawrence River Volunteer Monitoring

Part of the organization: River Institute

11.6K datapoints in 1,018 observations at 303 locations. 6 new observations this week.
Millstream Water Quality Monitoring Program

Part of the organization: Friends of Millstream Watershed

1,365 datapoints in 144 observations at 8 locations. 6 new observations this week.