Spring WaterBlitz 7-10 May 2021

Thames Valley | 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.

Upcoming events

Thames WaterBlitz

7-10 May 2021

Sorry, the Thames WaterBlitz is now fully subscribed! Please use the options below to express your interest in future events or discover new environmental projects with our exciting Earthwatchers programme.

Express Interest   Find New Projects

Dublin WaterBlitz

7-10 May 2021

Sorry, the Dublin WaterBlitz is now fully subscribed! River conditions in Dublin are being compromised due to changing land use. These changes have had major impacts on the use of rivers for recreation and drinking water supply. Join us and help make a difference in Dublin.

Paris WaterBlitz

Rescheduled: 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?


Luxembourg WaterBlitz

7-10 May 2021

Sorry, registration for the Luxembourg WaterBlitz is now closed! Luxembourg has experienced a large population increase over the past twenty years, negatively impacting biodiversity and water quality. Sign up and support our research partners at the University of Luxembourg.

Take part in a WaterBlitz near you!

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, Unsplash/Distillery Images, iStock/stevegeer, iStock/Nikada, iStock/bluejayphoto