Horsham was polluted by sewage 773 times in 2024
lasting 8,695 hours - that's 1.01 years!

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024
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✔ means we have experimental daily data since 2023
Live data for Horsham in 2025
So far this year (as of Apr 16, 2025, 6:00 PM) there has been 3,091 hours of sewage overflows - that's 0.36 years!
Totals for Horsham in 2024
13 Sites polluted by Southern Water, Thames Water
773 sewage dumps
8,695 h duration
That's 1.01 years! On average 2.1 times a day
Change Over Time
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Daily Data
We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Horsham, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
     Monitoring Online      Monitoring Offline      Polluting      Potentially Polluting      Unknown
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.

Pollution Summary 2024

Here are all the reported sewage overflow totals for Horsham in 2024. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency 0 of the total 14 CSO locations had reporting enabled for less than half the year, of which 0 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Southern Water River Arun MANNINGS HEATH WWTW 131 1,602 94.6
Southern Water River Adur PARTRIDGE GREEN S.T.W. 100 1,327 99.6
Southern Water River Arun SLINFOLD WWTW 104 1,189 99.9
Southern Water Nuthurst Stream MONKS GATE WWTW 92 1,123 99.1
Southern Water Cowfold Stream River Adur COWFOLD WWTW 73 957 99.9
Southern Water Par Brook BILLINGSHURST WWTW 61 664 100
Southern Water River Arun HORSHAM WWTW 45 625 98.9
Southern Water Parsons Brook BARNS GREEN WWTW 60 502 98.8
Southern Water Boldings Brook, River Arun WARNHAM WWTW 41 383 95.2
Southern Water River Arun RUDGWICK RECREATION GROUND CSO 20 117 99.7
Southern Water Par Brook LAND ADJ. BILLINGSHURST PUMP. STN 15 87 100
Southern Water Horn Brook KERVES LANE HORSHAM WPS 17 66 100
Southern Water Freshwater River FARHALLS CRESCENT HORSHAM CSO 14 48 99.8
Thames Water Ifield Brook COLGATE WASTEWATER TREATMENT WORKS 0 0 98.7

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. This 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.