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Latest News


River Mole River Watch - recent trends in storm overflows in Mole catchment.
Simon has made a video to explain the recent trends in storm overflows throughout the River Mole catchment Click here here for the link...
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Apr 21 min read
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Out of Order! Thames Water blame "heavy rain" for repeated Sewage Flooding from Horley Treatment Works
Sewage once again flooded into streets and properties from Thames Water's Horley Sewage Treatment Works (STW) on 5 January 2025. Sewage...
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Jan 2416 min read
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News from the River Mole: early January 2025
December and early January have been very busy months for River Mole River Watch.
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Jan 107 min read
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October pollution results: What are the emerging pollution patterns in the River Mole after 18 months of citizen science?
Eighteen months of citizen science data in the River Mole catchment reveal consistent and concerning patterns in water pollution.
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Nov 2, 20247 min read
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September River Mole test results: the solution to (hiding) pollution is dilution
We examine the early start to seasonal improvements in pollution across the catchment due to dilution from record breaking rainfall.
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Oct 8, 202410 min read
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Leigh Brook: The Most Polluted Stream in the River Mole Catchment?
Extremely high phosphate and ammoniacal nitrogen levels mean that Leigh Brook is probably the most polluted stream in the Mole catchment.
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Sep 17, 202416 min read
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August Pollution Test Results: River Mole shows some improvement over July spike but Water Quality is still Poor
Welcome to our August round-up of test results for the River Mole. Here are a few pictures from our citizen scientists taken on test day...
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Aug 31, 20249 min read
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Ofwat data reveals many failing Thames Water assets in the River Mole catchment
The recent Ofwat report proposes a £104 million fine on Thames Water for failing Urban Waste Water Treatment standards. The notice...
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Aug 16, 20245 min read
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Something bad is happening to the River Mole: shocking increase in pollution levels across the catchment!
Shocking and unprecedented jump in River Mole pollution levels this month is of great concern for river wildlife health and people.
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Aug 1, 202410 min read
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Rising pollution in the River Mole through early Summer, our tests reveal
Our water quality test results on the River Mole for June across the catchment show a disturbingly marked increase in levels of...
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Jul 23, 20249 min read
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River Mole News: Exciting New Testing Roll-Out and a Sharp Deterioration in water quality from April pollution test results!
Our wonderful citizen scientists were out monitoring water quality at all of our test sites across the River Mole catchment over the last...
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May 6, 20248 min read
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March test results for the River Mole catchment
March was another wet month with 110mm of rain falling in the River Mole catchment. This is over 200% of the long term average rainfall...
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Apr 5, 20244 min read
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January River Mole pollution data is in!
Here are the January pollution test results carried out by our fantastic River Mole River Watch citizen scientists. First off, above are...
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Feb 2, 20244 min read
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December pollution data is in!
Here are the pollution results for December 2023. Our fabulous River Mole River Watch citizen scientists collected data across the entire...
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Jan 8, 20242 min read
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November River Mole pollution data is out!
River Mole November pollution data is out! Things are getting complicated as more rainfall reduces Phosphate levels despite storm...
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Dec 7, 20231 min read
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October Test results are in!
River Mole River Watch October pollution test results are in! Overall catchment phosphate levels were down due to dilution in higher...
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Nov 8, 20231 min read
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River Mole September Health Check!
September pollution test results from River Mole citizen scientists are in (sorry for delay posting here)! Phosphate levels are somewhat...
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Oct 10, 20232 min read
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Visit to Dorking Sewage Works
In October 2022, Thames Water gave a group of us a tour of the sewage works to explain how they treat our waste water. It wasn't as...
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Jul 26, 20232 min read
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