Tonbridge

Polluted by sewage 438 times in 2025 lasting 3,185 hours

Monitoring fell below 50% in some locations so could be more

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Live data for Tonbridge in 2026

So far this year (as of 26 Oct 2026, 08:01) there has been 5,151 hours of sewage overflows, from 46 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Sewage without rain in Tonbridge

On 11 occasions since December 2024, no rain fell anywhere in Tonbridge for days — and its CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s discharged anyway.

19 Apr - 22 Apr 2026 1 at once · 8h 3 Apr - 4 Apr 2025 1 at once · 7h 16 Aug 2025 1 at once · 4h

Totals for Tonbridge in 2025

20 Sites polluted by Southern Water
438 sewage dumps
3,185 hours duration
Sewage pollution map of Tonbridge
Sewage pollution map of Tonbridge: 438 spills in 2025, lasting 3,185 hours, by Southern Water
That's 4.42 months. On average 1.2 times a day

Change Over Time

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Tonbridge in 2025. 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 1 of the total 23 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Southern Water Somerhill Stream PRIORY MILL TONBRIDGE WPS 53 611 92.9
Southern Water Hilden Brook COLDHARBOUR LANE PUMPING STATION 44 520 99.9
Southern Water River Eden EDENBRIDGE WWTW 48 415 97.5
Southern Water River Medway PENSHURST S.T.W. 61 350 99.9
Southern Water Hilden Brook COLDHARBOUR LANE CSO 19 232 85.7
Southern Water Botany Stream TONBRIDGE WWTW 19 201 100
Southern Water River Medway CANNON LANE COMBINED SEWER OVERFLOW 40 194 100
Southern Water River Medway FORDCOMBE WASTEWATER TREATMENT WRKS 21 98 97.7
Southern Water Unnamed Dicth/Stream EGGPIE LANE LEIGH CSO 21 92 98.3
Southern Water River Bourne REEDS LANE, SHIPBOURNE CEO 13 89 90.3
Southern Water Botany Stream PRIORY ROAD TONBRIDGE O/S 86 CSO 30 86 97.6
Southern Water River Medway HILDEN PARK PUMPING STATION 19 73 100
Southern Water Mill Stream MILL STREAM, TONBRIDGE CSO 12 63 100
Southern Water Hilden Brook HILDEN BRIDGE PUMPING STATION 7 61 100
Southern Water Freshwater River CHIDDINGSTONE CAUSEWAY PUMPING STN 6 25 100
Southern Water Little Hawden Stream CHARCOTT PLACE CEO 8 22 96.8
Southern Water River Medway HARTLAKE ROAD PUMPING STATION 5 19 97.3
Southern Water Hilden Brook HAWDEN ROAD TONBRIDGE CSO 4 16 18.9
Southern Water Hilden Brook RIDING LANE HILDENBOROUGH CSO 3 6 97.4
Southern Water River Bourne BOURNE BRIDGE CSO 5 4 100
Southern Water River Medway CHAFFORD LANE FORDCOMBE CEO 0 0 100
Southern Water River Medway ENFIELD ROAD LEIGH WPS 0 0 100
Southern Water River Medway LEIGH ROAD HILDENBOROUGH CSO 0 0 75.6

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.

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