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

387

organizations
Go to organizations
568

datasets
9,612

locations
81.7K

observations
732.8K

datapoints
Browse datapoints by location
4,093

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

31.1K datapoints in 1,583 observations at 186 locations. 28 new observations this week.
Lea Guardians

Part of the organization: Thames21

31.5K datapoints in 2,998 observations at 131 locations. 18 new observations this week.
BVAR

Part of the organization: Blackwater Valley Action for our Rivers

2,720 datapoints in 231 observations at 33 locations. 17 new observations this week.
ZERO Guildford Hub

Part of the organization: River Wey Trust

12.4K datapoints in 796 observations at 33 locations. 11 new observations this week.
South Wey Hub

Part of the organization: River Wey Trust

15.1K datapoints in 993 observations at 71 locations. 9 new observations this week.
Cranleigh Hub

Part of the organization: River Wey Trust

4,949 datapoints in 298 observations at 26 locations. 8 new observations this week.