Horsham was polluted by sewage 984 times in 2023
lasting 11,004 hours - that's 1.27 years!

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
✔ means we have experimental daily data since 2023
Totals for Horsham in 2023
20 Sites polluted by Southern Water, Thames Water
984 sewage dumps
11,004 h duration
That's 1.27 years! On average 2.7 times a day
Change Over Time
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Daily Data Since 2023
     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 2023

Here are all the reported sewage overflow totals for Horsham in 2023. 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 21 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 Nuthurst Stream MONKS GATE WWTW 127 1,961 98.2
Southern Water River Arun MANNINGS HEATH WWTW 121 1,898 100
Southern Water River Ouse BALCOMBE WASTEWATER TREATMENT WORKS 121 1,401 99.65
Southern Water River Arun SLINFOLD WWTW 90 1,083 98.9
Southern Water Par Brook BILLINGSHURST WWTW 73 935 99.7
Southern Water River Arun HORSHAM WWTW 58 776 99.7
Southern Water Parsons Brook BARNS GREEN WWTW 63 569 99.9
Southern Water Boldings Brook, River Arun WARNHAM WWTW 48 507 100
Southern Water Lywood Stream ARDINGLY WWTW 36 366 100
Southern Water Freshwater River PARTRIDGE PLACE PUMPING STATION 49 364 99.9
Southern Water Freshwater River FARHALLS CRESCENT HORSHAM CSO 32 288 100
Southern Water River Medway WITHYPITTS PUMPING STATION 44 239 99.8
Southern Water River Arun RUDGWICK RECREATION GROUND CSO 26 176 100
Thames Water Gatwick Stream Pease Pottage 15 139 84
Southern Water Horn Brook KERVES LANE HORSHAM WPS 30 132 99.2
Southern Water Par Brook LAND ADJ. BILLINGSHURST PUMP. STN 16 84 99.7
Southern Water River Medway HAZEL WAY PUMPING STATION 16 49 99.9
Southern Water Balcombe Lake ST JAMES COTTAGE BALCOMBE CSO 14 20 99.9
Southern Water Felbridge Wtr FERNHILL CLOSE CRAWLEY DOWN 2 6 27.4
Southern Water Lywood Stream River Ouse ARDINGLY WWTW, ARDINGLY 3 3 100

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.