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Area of Outstanding Natural Beauty

Surrey Hills - 2025 Sewage

Polluted by sewage 1,804 hours in 2025 , monitoring offline 1,487 hours , potential overflows 488 hours

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

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Totals for 2025

Sewage1,804 hours
Monitoring offline1,487 hours
Potential pollution488 hours
Storm overflows21

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Daily Data - when it rained, and when they spilled

Square = rainfall none → heavy
Drop = sewage minutes → all day
Potential pollution Monitoring offline
Jan - 638 hours
Feb - 381 hours
Mar - 12 hours , 304 offline
Apr - 4 hours , 273 offline
May - 61 hours , 121 potential
Jun - 8 hours , 367 potential
Jul - 18 hours
Aug - 0 hours , 235 offline
Sept - 16 hours
Oct - 99 hours , 494 offline
Nov - 83 hours , 178 offline
Dec - 479 hours

Storm overflows in and around Surrey Hills

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Southern Water CHIDDINGFOLD SSO - 115804 Chiddingfold Stream 31 421h 51m -
Southern Water CHIDDINGFOLD SSO - 115804 Chiddingfold Stream 19 308h 29m -
Thames Water Dorking STW River Mole 20 257h 45m -
Thames Water Stonebridge sso, brockham River Mole 22 240h 488 h
Southern Water GRAYSWOOD CSO - 115984 Two S Of River Chidd 24 197h -
Southern Water GRAYSWOOD CSO - 115984 Two S Of River Chidd 12 86h 33m -
Southern Water TURNERS MEAD CHIDDINGFOLD CEO - 108370 Freshwater River 11 70h 2m -
Thames Water Dorking STW River Mole 3 45h 45m -
Thames Water Castle Gardens (Dorking) SPS Mole 7 36h 15m -
Thames Water Waverley Lane (Farnham) SPS Farnham Bourne 4 22h 30m 186 h
Thames Water Spooks hill, north holmwood Tanners Brook 8 22h 676 h
Thames Water Stonebridge sso, brockham River Mole 3 21h 45m -
Southern Water TURNERS MEAD CHIDDINGFOLD CEO - 108370 Freshwater River 4 17h 7m -
Thames Water Boxhill SPS Into Land 9 11h 15m 235 h
Thames Water Boxhill SPS Into Land 3 10h -
Thames Water Waverley Lane (Farnham) SPS Farnham Bourne 2 10h -
Southern Water NORTHBRIDGE CHIDDINGFOLD CEO - 108295 Un River Arun 1 5h 56m -
Thames Water Spooks hill, north holmwood Tanners Brook 1 5h 45m -
Thames Water Castle Gardens (Dorking) SPS Mole 1 5h 45m -
Thames Water Churt SPS Whitmoor Vale Stream 1 5h 18m -
Thames Water Churt SPS Whitmoor Vale Stream 4 3h 4m 388 h

Data Sources & Accuracy

EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales, and Scottish Water

Experimental derived data from Thames Water API, Some data may be missing or inaccurate. Live sewage data from Stream Water API

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

Uses Environment Agency rainfall data from the real-time data API (Beta) - Rainfall data is delayed by up to two days.

This website is intended to provide an accurate representation of the Environment Agency data. The data is hard to use, and thus some errors may have been made. If you find something that is incorrect, please raise an issue at the GitHub issues page and we'll endeavour to fix it quickly.

This project is not associated, approved or endorsed by any of the companies whose logos you see here.