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.

Totals for Horsham in 2025

Sewage6,804 hours
Monitoring offline0 hours
Potential pollution3 hours
Storm overflows31

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

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.