The Facts

River Mole River Watch citizen science reveals how storm overflows pushed pollution higher during the season rivers should have lowest pollution concentration. This winter our dedicated citizen scientists have been out testing in rain and flood conditions, and their data are now revealing a clearer and more detailed understanding of how the River Mole behaves during winter high flows and prolonged periods of sewage overflow activity. Within this growing dataset, some concerni

A Newsflash prompted by recent observations and monitoring results, issued ahead of our next scheduled February catchment update coming soon. More than one kilometre of Earlswood Brook is currently coated in extensive sewage fungus downstream of Reigate / Earlswood Sewage Treatment Works (STW), following a period of prolonged storm overflow activity at the site. The growth blankets large sections of the stream bed, banks and in-channel debris in thick grey-brown mats — a well

Flooded River Mole at Cobham Our fantastic team of citizen science volunteers were out again monitoring the health of every river and stream in the Mole catchment on 24-25 January following flooding which peaked on 22 January. Their tests revealed something genuinely new in our water quality data. Despite very high river levels and the dilution that usually comes with them, we recorded unusually high ammonia and phosphate concentrations , particularly in small tributaries do