Spring WaterBlitz 2021

Thames | Dublin | Luxembourg

7-10 May, 2021

Thank you to everyone who took part in this pan-European WaterBlitz. Click below to read the results of our biggest event to date!

WaterBlitz Report


The WaterBlitz is a four-day event run by Earthwatch, designed to help us find out more about the water quality of specific areas over a short period of time. We believe that we cannot truly understand what is going on in our rivers without collecting evidence that demonstrates how healthy (or unhealthy) they really are.

Most of our natural waters in Europe are suffering from pollution and other human impacts. We use data collected by you during the WaterBlitz to identify clean waters, to pinpoint pollution hotspots, and to help inform where, who, when and how remedial actions should be taken. We could never collect this much information by ourselves, so we ask you to help us. Alongside our 11th WaterBlitz in the Thames catchment area, we were also joined by citizens in Dublin and Luxembourg. A summary of the data collected is shown below.


Download the WaterBlitz Report for a scientific analysis of the data collected. We have also partnered with the UK Centre for Ecology & Hydrology to publish an interactive map allowing the direct comparison between Thames WaterBlitz data and Environment Agency monitoring data. This map, along with relevant findings, will be shared with the Environment Agency, who will incorporate the research into their decision-making process.

In your words

Congratulations on a great WaterBlitz - Citizen Science at its best!

As an angler, I already assumed there were water quality issues in parts of my local rivers and it's satisfying to know that the kits have proved it.

I understand more about the influences on the quality of water that I like to swim in.

As a family of four we all learnt to look for damage to our local rivers and that we do all need to look after our environment.

I visited a nearby stream that I had never stopped at before and better realised how pleasant it was to stay for a while.


Image credit: Peter White, John Hunt