Redgate Mill Crowborough storm overflow
Southern Water · Redgate Mill Crowborough CSO - 115999 · SWS00700
This page collects what public records say about one storm overflow: its permit, how often it spilled, and the improvements recorded for it. It is not a water test and does not say whether the water is fit to swim in. A spill count is not a finding that the overflow broke its permit: overflows may spill in heavy rain under their permits, and nothing here can tell whether a spill was allowed.
The record
| Company | Southern Water |
|---|---|
| Environment Agency id | SWS00700 |
| Name in the company's return | REDGATE MILL CROWBOROUGH CSO - 115999 |
| Permit reference | W00479, activity Storm (2025 return) |
| Type | Inlet SO at WwTW |
| Discharges to | ERIDGE STREAM (water body: Eridge Stream) |
The permit reference is as the Environment Agency's annual returns give it. The EA's consents register holds the permit itself, but its licence allows internal use only, so its conditions are not published here.
Swim spots downstream
SwimSignal counts this overflow at 1 swim spot. km is along the river network, through any lake on the way. The model weight is SwimSignal's estimate of how much this overflow's spills count at that spot, not a measurement (how it is worked out).
- River Medway, Tonbridge · 29.8 km upstream · model weight 6% · every overflow there
Spills each year
| Year | Spills | Spill hours | Monitor uptime |
|---|---|---|---|
| 2021 | – | – | – |
| 2022 | 3 | 2.17 | 100% |
| 2023 | 0 | 0 | 100% |
| 2024 | 0 | 0 | 100% |
| 2025 | 0 | 0 | 33.33% |
From the water company's annual return to the Environment Agency, as published: the spill count as the company returned it, and the hours as the Environment Agency works them out from the return's total duration, to two decimal places. Spills are counted by the Environment Agency's 12/24 method: any discharge in the first 12 hours counts as one spill, then one more for each 24 hours with any discharge. A dash: no return for that year. Monitor uptime is the share of the year the monitor worked; a year with low uptime may undercount.
Recent spills
When this page was updated (31 Oct 2026, 20:24), the live feed's last reading for it was not current. The last spill the feed reported ended on 27 May 2025.
Each spill's start and stop times: not listed here. The Environment Agency publishes them for 2024 on, under the Open Government Licence (its start/stop files). Southern Water publishes its own files from 2017; they carry no licence, so SwimSignal does not use them.
Improvements recorded
| Return year | Improvement activity | Investigation activity |
|---|---|---|
| 2024 | No improvement action in reporting period | No investigation activity in reporting period |
| 2025 | No improvement action in reporting period | Env Act (SODRP) investigation ongoing |
Word for word from the annual returns. The 2023 return left these columns empty. A year's entry covers that year only; work under way may not show until a later return.
The Environment Agency's PR24 Water Industry National Environment Programme (WINEP) lists 2 actions on this overflow's permit. The date is the date the action should be delivered, a deadline, not a record that it was:
- REDGATE MILL CROWBOROUGH CSO (08SO100178, EnvAct_IMP4): due 31 March 2035. The programme names the permit, which 2 overflows share, so this action may concern another of them.
- REDGATE MILL CROWBOROUGH SSO (08SO103907, EnvAct_IMP2): due 31 March 2035. The programme names the permit, which 2 overflows share, so this action may concern another of them.
Not published here: Southern Water's planned dates (its Clean Rivers and Seas Plan layer), which carry no licence; Water UK's National Storm Overflows Plan, whose terms forbid reuse without written permission.
Send this record
The button opens your own email app with a short, factual draft about this overflow and a link to this page. Read it, change it as you wish, and add the address yourself: SwimSignal sends nothing and keeps no copy.
Southern Water's own contact details are on its contact page. To send the same record to your MP, find your MP on the UK Parliament website.
The draft
Storm overflow Redgate Mill Crowborough storm overflow (SWS00700) Dear Southern Water, I am writing about your storm overflow Redgate Mill Crowborough storm overflow (Environment Agency id SWS00700, permit W00479). It is upstream of River Medway, Tonbridge, where people swim. Your annual returns to the Environment Agency record 2024: 0 spills, 0 hours; 2025: 0 spills, 0 hours. Your 2025 return lists its improvement activity as: "No improvement action in reporting period". The Environment Agency's PR24 WINEP sets 31 March 2035 as the date for the action "REDGATE MILL CROWBOROUGH CSO" (08SO100178). Could you tell me what is planned for this overflow, and when the work is expected to be finished? The public record I am referring to is here: https://swimsignal.co.uk/overflow/SWS00700/ Thank you.
Sources and credits
Storm overflow annual returns, including permit references and improvement and investigation activity: © Environment Agency copyright and/or database right, Open Government Licence v3.0; the figures are the water companies' own returns. PR24 Water Industry National Environment Programme: © Environment Agency copyright and/or database right 2025. All rights reserved. Published under the Open Government Licence. Spill lengths: Environment Agency storm overflow EDM start/stop data 2024 and 2025, Open Government Licence v3.0. Live status: the water companies via the National Storm Overflow Hub, CC BY 4.0. Spots, distances and model weights: SwimSignal, traced on OS Open Rivers (contains OS data © Crown copyright and database right 2026). Sources: annual returns, PR24 WINEP, start/stop data, National Storm Overflow Hub. All credits and licences.