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

369

organizations
Go to organizations
558

datasets
9,459

locations
79.2K

observations
689.6K

datapoints
Browse datapoints by location
3,952

data contributors

Popular testing spots

›

Recently sampled and photographed

Most active datasets

Active this week

Lake Erie Rangers Monthly Monitoring

Part of the organization: Lake Erie Rangers

26.8K datapoints in 1,405 observations at 175 locations. 46 new observations this week.
BVAR

Part of the organization: Blackwater Valley Action for our Rivers

2,302 datapoints in 180 observations at 32 locations. 18 new observations this week.
Big Rideau Lake Water Quality

Part of the organization: Big Rideau Lake Association

7,905 datapoints in 761 observations at 45 locations. 18 new observations this week.
Roundhay Freshwater Watch

Part of the organization: Roundhay Environmental Action Project and Friends of Roundhay Park

5,533 datapoints in 267 observations at 16 locations. 15 new observations this week.
Mississippi Water Stewards

Part of the organization: Mississippi State University

44.7K datapoints in 2,942 observations at 122 locations. 15 new observations this week.
Upper St. Lawrence River Volunteer Monitoring

Part of the organization: River Institute

12.7K datapoints in 1,076 observations at 308 locations. 13 new observations this week.