Already a Water Ranger? Login

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

381

organizations
Go to organizations
562

datasets
9,524

locations
80.5K

observations
713.1K

datapoints
Browse datapoints by location
4,022

data contributors

Popular testing spots

›

Recently sampled and photographed

Most active datasets

Active this week

Lea Guardians

Part of the organization: Thames21

30.4K datapoints in 2,915 observations at 131 locations. 18 new observations this week.
OART River Rangers

Part of the organization: Ouse & Adur Rivers Trust

4,230 datapoints in 231 observations at 39 locations. 9 new observations this week.
Lake Erie Rangers Monthly Monitoring

Part of the organization: Lake Erie Rangers

28.6K datapoints in 1,477 observations at 176 locations. 8 new observations this week.
Colquitz Water Quality

Part of the organization: Peninsula Streams Colquitz Watershed Monitoring

1,154 datapoints in 110 observations at 8 locations. 8 new observations this week.
Friends of Swan Creek Watershed

Part of the organization: Friends of Swan Creek Watershed

8,139 datapoints in 1,373 observations at 21 locations. 8 new observations this week.
Brent Catchment Water Quality Working Group

Part of the organization: Thames21

9,982 datapoints in 744 observations at 104 locations. 7 new observations this week.