Check a stream
Help look after the water near you
- Takes about two minutes, no sign-up.
- Your report tells neighbours, dog owners and the city how the stream is doing.
Which stream are you at?
Just curious?
Read the colour of any water
Try the colour reading without sending anything. It happens on your device — your photo is never uploaded.
We read the water's colour from the middle of your photo, the way scientists compare water against a colour chart.
- Aim the middle at open water
- Leave out the bank and plants
- Avoid glare and your shadow
Your full photo never leaves your phone. Only the colour we find, and a small, low-resolution thumbnail we use once to check it's really a photo of water, are sent — the thumbnail is never stored or shown to anyone.