WaterBlitz 2021

Thames | Bristol | Dublin | Paris | Luxembourg

Be a citizen scientist. Test water quality near you.

What is a WaterBlitz?

A WaterBlitz is a FreshWater Watch activity for the whole community. Usually hosted over one weekend, members of the public can sign up to receive a free water testing kit and become citizen scientists by testing a water body local to them. The data collected by hundreds of people over this same time period gives us an accurate and comparable snapshot of water health within a region. Learn more with our WaterBlitz leaflet.

In the UK, events are held across the Thames Valley and Bristol Avon catchment areas. The WaterBlitz also runs in Ireland, France, Luxembourg, Italy and Sweden.

For information about how to organise your own WaterBlitz, contact us.

WaterBlitz 2021

Bristol Avon WaterBlitz

9-12 July 2021

BART are seeking river guardians to gain a snapshot of water quality across the Bristol Avon catchment. Help us protect and enhance a river under pressure by registering for the Bristol Avon WaterBlitz.

Sorry, this event has ended.

Paris WaterBlitz

4-7 June 2021

The River Seine and many of Paris' other waterbodies have been impacted by urban activities and the loss of green buffer areas. Can you help us to investigate water quality in the rivers, streams, lakes and ponds of Paris?

Sorry, this event has ended.

Pan-European WaterBlitz

7-10 May 2021

Alongside our 11th Thames WaterBlitz, we were joined by citizens from Ireland and Luxembourg. In total, 1,214 volunteers took part, recording 1,568 measurements across all three locations!


Making data count

We believe that we cannot truly understand what is going on in our rivers without collecting evidence to demonstrate how healthy, or unhealthy, they really are. We use data collected by you during a WaterBlitz to identify clean waters, to pinpoint pollution hotspots, and to help inform where, who, when and how remedial actions should be taken.

Past events

Thames WaterBlitz

25-28 September 2020

An amazing 879 volunteers took part in our largest ever Thames Valley event! Click below to read the full WaterBlitz report and view an interactive data map.

Find out more

Pan-European WaterBlitz

20-23 September 2019

Our first ever Pan-European WaterBlitz saw events held simultaneously in London, Dublin, Paris and Luxembourg. Over 1,100 volunteers took part, uploading nearly 1,000 water quality measurements!

Find out more


Images: John Hunt, Samuel Oakes, Unsplash/Distillery Images, iStock/Nikada