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We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Rochester and Strood, 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.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| Southern Water | MAGPIE HALL ROAD CHATHAM OUTSIDE 60 CSO - 108673 | River Medway Estuary | 20 | 444 h 55m | 18.5 |
| Southern Water | CHATHAM HILL CHATHAM OUTSIDE 425 CSO - 108603 | River Medway Estuary | 41 | 194 h 58m | 8.08 |
| Southern Water | CORPORATION STREET ROCHESTER NO 2 CSO - 108620 | Tidal Estaury Of River Medway | 9 | 145 h 20m | 6.04 |
| Southern Water | CHATHAM HILL CHATHAM OUTSIDE 425 CSO - 108603 | River Medway Estuary | 17 | 133 h 32m | 5.54 |
| Southern Water | Unknown | Unknown | 6 | 118 h 8m | 4.92 |
| Southern Water | DOCK ROAD GILLINGHAM CSO - 108628 | River Medway | 8 | 96 h 56m | 4 |
| Southern Water | NORTHGATE ROCHESTER CSO - 108692 | Tidal Estuary Of River Medway | 44 | 67 h 21m | 2.79 |
| Southern Water | CONSTITUTION HILL CHATHAM CSO - 108616 | Tidal Estuary Of River Medway | 30 | 66 h 44m | 2.75 |
| Southern Water | HOO ST WERBURGH SSO - 115968 | River Medway Estuary | 9 | 59 h 59m | 2.46 |
| Southern Water | BRAMBLETREE CRESCENT BORSTAL CEO - 108904 | River Medway Estuary | 12 | 42 h 10m | 1.75 |
| Southern Water | DOCK ROAD GILLINGHAM CSO - 108628 | River Medway | 19 | 32 h 57m | 1.33 |
| Southern Water | GRAIN CEO - 115411 | Medway Estuary | 17 | 23 h 48m | 0.96 |
| Southern Water | SECOND AVENUE CHATHAM NO 2 CSO - 108726 | River Medway Estuary | 3 | 21 h 13m | 0.88 |
| Southern Water | FRINDSBURY ROAD STROOD CSO - 108637 | Medway Estuary | 3 | 15 h 15m | 0.62 |
| Southern Water | MAGPIE HALL ROAD CHATHAM OUTSIDE 33 CSO - 108674 | River Medway Estuary | 13 | 14 h 22m | 0.58 |
| Southern Water | Unknown | Unknown | 1 | 7 h 7m | 0.29 |
| Southern Water | HOO ST WERBURGH SSO - 115968 | River Medway Estuary | 1 | 7 h 1m | 0.29 |
| Southern Water | CORPORATION STREET ROCHESTER NO 1 CSO - 108619 | River Medway Estuary | 5 | 6 h 15m | 0.25 |
| Southern Water | CHARLES STREET STROOD CSO - 108601 | Medway Estuary | 1 | 5 h 21m | 0.21 |
| Southern Water | Unknown | Unknown | 2 | 4 h 48m | 0.17 |
| Southern Water | CLOVER STREET CHATHAM CSO - 108608 | River Medway Estuary | 3 | 4 h 44m | 0.17 |
| Southern Water | NEW BROOK CHATHAM CEO - 108687 | Saline Estuary | 1 | 3 h 56m | 0.12 |
| Southern Water | GODDINGTON ROAD STROOD CSO - 108638 | River Medway | 4 | 3 h 20m | 0.12 |
| Southern Water | RIDGEWAY BANKS CHATHAM CSO - 108873 | River Medway | 2 | 2 h 21m | 0.08 |
| Southern Water | VICARAGE ROAD STROOD CEO - 108750 | River Medway Estuary | 1 | 2 h 12m | 0.08 |
| Southern Water | ROCHESTER AVENUE ROCHESTER CSO - 108720 | River Medway | 3 | 1 h 30m | 0.04 |
| Southern Water | CORPORATION STREET ROCHESTER NO 2 CSO - 108620 | Tidal Estaury Of River Medway | 2 | 1 h 23m | 0.04 |
| Southern Water | MARSH LANE CLIFFE CEO - 108607 | Cliffe Creek | 2 | 0 h 58m | 0 |
| Southern Water | MAGPIE HALL ROAD CHATHAM OUTSIDE 33 CSO - 108674 | River Medway Estuary | 1 | 0 h 42m | 0 |
| Southern Water | SECOND AVENUE CHATHAM NO 3 CSO - 108874 | River Medway Estuary | 1 | 0 h 42m | 0 |
| Southern Water | MARSH ROAD HALLING CEO - 111646 | Tidal River Medway | 1 | 0 h 41m | 0 |
| Southern Water | SECOND AVENUE CHATHAM NO 1 CSO - 108725 | River Medway Estuary | 1 | 0 h 40m | 0 |
| Southern Water | GROVE ROAD CHATHAM OUTSIDE 1 CSO - 108646 | Medway Estuary | 1 | 0 h 30m | 0 |
| Southern Water | WALDERSLADE ROAD CHATHAM OUTSIDE 149 CSO - 108752 | River Medway Estuary | 1 | 0 h 18m | 0 |
| Southern Water | CHARLES STREET STROOD CSO - 108601 | Medway Estuary | 1 | 0 h 6m | 0 |
| Southern Water | MARSH ROAD HALLING CEO - 111646 | Tidal River Medway | 1 | 0 h | 0 |
| Southern Water | CASTLE HILL ROCHESTER CSO - 109538 | River Medway | 1 | 0 h | 0 |
| Southern Water | MAIDA ROAD CHATHAM CSO - 108675 | River Medway | 1 | 0 h | 0 |
| Southern Water | SECOND AVENUE CHATHAM NO 1 CSO - 108725 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | VICARAGE ROAD STROOD CEO - 108750 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | STURLA ROAD CHATHAM CSO - 108741 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | MARSH LANE CLIFFE CEO - 108607 | Cliffe Creek | 0 | 0 h | 0 |
| Southern Water | CASTLE HILL ROCHESTER CSO - 109538 | River Medway | 0 | 0 h | 0 |
| Southern Water | Unknown | Unknown | 0 | 0 h | 0 |
| Southern Water | RIDGEWAY BANKS CHATHAM CSO - 108873 | River Medway | 0 | 0 h | 0 |
| Southern Water | SECOND AVENUE CHATHAM NO 2 CSO - 108726 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | BRAMBLETREE CRESCENT BORSTAL CEO - 108904 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | NEW BROOK CHATHAM CEO - 108687 | Saline Estuary | 0 | 0 h | 0 |
| Southern Water | WALDERSLADE ROAD CHATHAM OUTSIDE 149 CSO - 108752 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | CLOVER STREET CHATHAM CSO - 108608 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | GODDINGTON ROAD STROOD CSO - 108638 | River Medway | 0 | 0 h | 0 |
| Southern Water | FRINDSBURY ROAD STROOD CSO - 108637 | Medway Estuary | 0 | 0 h | 0 |
| Southern Water | CONSTITUTION HILL CHATHAM CSO - 108616 | Tidal Estuary Of River Medway | 0 | 0 h | 0 |
| Southern Water | BRYANT ROAD STROOD CSO - 108594 | Tidal River Medway | 0 | 0 h | 0 |
| Southern Water | NORTHGATE ROCHESTER CSO - 108692 | Tidal Estuary Of River Medway | 0 | 0 h | 0 |
| Southern Water | Unknown | Unknown | 0 | 0 h | 0 |
| Southern Water | MAIDA ROAD CHATHAM CSO - 108675 | River Medway | 0 | 0 h | 0 |
| Southern Water | GROVE ROAD CHATHAM OUTSIDE 1 CSO - 108646 | Medway Estuary | 0 | 0 h | 0 |
| Southern Water | STURLA ROAD CHATHAM CSO - 108741 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | GROVE ROAD CHATHAM OUTSIDE 77 CSO - 108647 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | MELBOURNE ROAD CHATHAM CSO - 108682 | River Medway Estuary | 0 | 0 h | 0 |
| Southern Water | GRAIN CEO - 115411 | Medway Estuary | 0 | 0 h | 0 |
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.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org