Thames WaterBlitz


The Thames WaterBlitz is a campaign to collect as many water samples as possible (in a short period of time) from across the Thames catchment. Blitz events are held throughout the year and create an invaluable snapshot of the health of our rivers that will help to direct future conservation efforts. View our Frequently Asked Questions below or contact us at

Click here to read our report of the Pan-European WaterBlitz Autumn 2019

Next Event

Thames WaterBlitz Spring 2020 - POSTPONED UNTIL AUTUMN 2020

Friday, 24 April 2020 (All day) to Monday, 27 April 2020 (All day)

We are sorry to announce that, in light of government advisories as the situation with Covid-19 develops, we have taken the decision to postpone the Thames WaterBlitz until Autumn 2020. Exact dates will be confirmed in due course. Please follow the latest government advice to ensure that you stay safe. If you are looking for other ways to stay connected to nature while self-isolating, please sign up to the Earthwatch newsletter where we’ll be sharing plenty of ideas over the coming weeks.

Registration Closed



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I cannot log in to the website
When you registered we sent you an email with the subject "FreshWater Watch: Account Details". This email contains your log in information. If you enter an incorrect username or password several times the system will block your account. Please contact us if you have any problems.

I cannot log in to the app
Please enter your username (not your email address) to log in to the app. When you registered we sent you an email with the subject "FreshWater Watch: Account Details". This email contains your log in information.

How do I get my kit?
We provide a free water testing kit. This will be posted to the address that you provided on your registration form.

How do I enter my results?
We recommend you download the FreshWater Watch app (log in and look under "My Next Steps"). The app is available for android and iOS mobile phones.

How do I use the app?
Install and open the app on your device (use the same username and password that you use for the website). Tap on the menu to upload a record. If you have any problems, try deleting and reinstalling the app.

Android Users: Your device should be version 5 or above. Many devices can be updated in Settings > More > About device > Software update > Update now.

Do I have to use the FreshWater Watch app?
The app helps simplify some parts of the sampling such as recording geolocation but volunteers are welcome to use a datasheet if they prefer. Please download and print the WaterBlitz Datasheet (log in and look under "My Next Steps"). Take the datasheet with you to record your results. When you return home, log in to the website and click "Upload a Record".

If you have any other questions please let us know.