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Horsham - 2025 Sewage

Polluted by sewage 6,804 hours in 2025 , potential overflows 3 hours

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Horsham for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

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Constituencies near Horsham

Daily Data

Jan - 1,792 hours
Feb - 1,443 hours
Mar - 51 hours
Apr - 16 hours
May - 0 hours
Jun - 13 hours
Jul - 107 hours
Aug - 208 hours , 3 potential
Sept - 245 hours
Oct - 557 hours
Nov - 422 hours
Dec - 1,945 hours
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
Please note: We don't have rainfall data for Wales. If you know where to source it please let us know!
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Southern Water MONKS GATE SSO - 115805 Nuthurst Stream 80 1,301 h 48m -
Southern Water MANNINGS HEATH SSO - 115739 River Arun 38 616 h 51m -
Southern Water MONKS GATE SSO - 115805 Nuthurst Stream 25 490 h 27m -
Southern Water SLINFOLD SSO - 116044 River Arun 28 467 h 29m -
Southern Water COWFOLD SSO - 115726 Cowfold Stream River Adur 30 401 h 56m -
Southern Water PARTRIDGE GREEN SSO - 115766 River Adur 31 378 h 8m -
Southern Water MANNINGS HEATH SSO - 115739 River Arun 19 357 h 46m -
Southern Water BARNS GREEN SSO - 115748 Parsons Brook 34 326 h 4m -
Southern Water PARTRIDGE GREEN SSO - 115766 River Adur 16 294 h 2m -
Southern Water BILLINGSHURST SSO - 115764 Par Brook 24 289 h 13m -
Southern Water HORSHAM NEW SSO - 115826 River Arun 21 268 h 10m -
Southern Water COWFOLD SSO - 115726 Cowfold Stream River Adur 13 256 h 57m -
Southern Water WARNHAM SSO - 115747 Boldings Brook, River Arun 18 198 h 22m 3 h
Southern Water FARHALLS CRESCENT HORSHAM CSO - 102550 Freshwater River 13 187 h 21m -
Southern Water BILLINGSHURST SSO - 115764 Par Brook 10 140 h 31m -
Southern Water BARNS GREEN SSO - 115748 Parsons Brook 11 139 h 38m -
Southern Water WARNHAM SSO - 115747 Boldings Brook, River Arun 10 113 h 23m -
Southern Water HORSHAM NEW SSO - 115826 River Arun 8 102 h 55m -
Southern Water STANE STREET BILLINGSHURST CEO - 108189 Par Brook 14 95 h 22m -
Southern Water SLINFOLD SSO - 116044 River Arun 11 90 h 34m -
Thames Water Rusper SPS Baldhorns Brook 18 83 h 45m -
Southern Water RUDGWICK RECREATION GROUND CSO - 108268 River Arun 11 74 h 29m -
Southern Water KERVES LANE HORSHAM CSO - 108321 Horn Brook 8 45 h 22m -
Southern Water STANE STREET BILLINGSHURST CEO - 108189 Par Brook 3 28 h 16m -
Thames Water Rusper SPS Baldhorns Brook 5 22 h 30m -
Southern Water RUDGWICK RECREATION GROUND CSO - 108268 River Arun 5 16 h 40m -
Southern Water KERVES LANE HORSHAM CSO - 108321 Horn Brook 2 16 h -
Southern Water FARHALLS CRESCENT HORSHAM CSO - 102550 Freshwater River 0 0 h -
Thames Water Colgate STW Ifield Brook 0 0 h -
Southern Water COWFOLD CEO - 115981 Cowfold Stream River Adur 0 0 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

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.

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© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

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