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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

354

organizations
Go to organizations
533

datasets
9,215

locations
75.8K

observations
634.7K

datapoints
Browse datapoints by location
3,747

data contributors

Popular testing spots

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Recently sampled and photographed

Most active datasets

Active this week

Lake Erie Rangers Monthly Monitoring

Part of the organization: Lake Erie Rangers

22.2K datapoints in 1,223 observations at 169 locations. 12 new observations this week.
Winter Chloride Watch

Part of the organization: National Great Rivers

44.1K datapoints in 8,079 observations at 468 locations. 9 new observations this week.
Lea Guardians

Part of the organization: Thames21

26.3K datapoints in 2,596 observations at 129 locations. 9 new observations this week.
OART River Rangers

Part of the organization: Ouse & Adur Rivers Trust

2,383 datapoints in 125 observations at 38 locations. 8 new observations this week.
Mississippi Water Stewards

Part of the organization: Mississippi State University

41K datapoints in 2,732 observations at 117 locations. 8 new observations this week.
Goulais River Water Quality Monitoring Program

Part of the organization: Lake Superior Watershed Conservancy

1,334 datapoints in 36 observations at 6 locations. 6 new observations this week.