Stations are listed from source to mouth as the water flows, traced on the river map (OS Open Rivers) and the Environment Agency’s own links between its gauges. A distance “by river” is along the river, and is shown only where the map traces the path.
Streams and rivers with a gauge whose water joins the Medway above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.
Its water passes Leigh Flood Storage Area and every gauge below it on the Medway. It does not pass Colliers Land Bridge or the gauges above it.
Gauged streams joining the Eden Tributary Medway
River Eden: joins the Eden Tributary Medway above Penshurst (its lowest gauge is 3.4 km by river above it). Gauge, source first: VEXOUR USGS; and 3 more gauges further up.
Named streams on the river map that flow into the Medway and have no gauge of their own. Each has a page with what is known about it: the next gauge downstream, and any storm overflows or water-sampling points placed on it.
Botany Stream (joins about 3.2 km above Hartlake Bridge)
Tudeley Brook (joins about 2.6 km above Yalding Hampstead Lock)
Storm overflows upstream
79 storm overflows are traced upstream of Allington Lock, the Medway’s lowest gauge on the river map: on the Medway itself, on its gauged tributaries, and on smaller streams that join above there.
0 report discharging now
75 not discharging
4 offline or silent: 0 monitor offline, 3 status unknown, 1 no live feed
Official figures for 2025, for the overflows traced upstream of Allington Lock: 1,401 spills over 9,938 hours in total, across all 79.
Each overflow is listed in the stretch above the first gauge its water reaches, from the source down, as on the Gauges tab. A stretch of the Medway includes the smaller streams that join it there. Every overflow traced is listed here, each stretch in full. Back to the short lists →
Above Forest Row, the Medway’s highest gauge3 overflows
Partridge Place Turners Hill CEONot discharging Southern Water · into Trib Of The River Medway · 13.1 km by river above Forest Row · 2025: 34 spills, 294 h
Luxford Ln-East Grinstead WwTWNot discharging Southern Water · into The Sunnyside Stream · 5.4 km by river above Forest Row · 2025: 15 spills, 55 h · placed on the river by its position alone
CSO At Station Road - Forest RowNot discharging Southern Water · into River Medway · 1.2 km by river above Forest Row · 2025: 14 spills, 38 h
Between Forest Row and Summerford Bridge3 overflows
Hartfield Road CSONot discharging Southern Water · into The River Medway · 7.9 km by river above Summerford Bridge · 2025: 56 spills, 439 h
Forest Row WwTWNot discharging Southern Water · into River Medway · 5.6 km by river above Summerford Bridge · 2025: 20 spills, 233 h
Hartfield WwTWNot discharging Southern Water · into Tributary Of The River Medway · 2.0 km by river above Summerford Bridge · 2025: 30 spills, 312 h
Between Summerford Bridge and Chafford6 overflows
Neville Street Tunbridge Wells CSONot discharging Southern Water · into The River Grom · 13.0 km by river above Chafford · 2025: 16 spills, 16 h
Cowden WwTW, Cowden, Tunbridge WellNot discharging Southern Water · into Kent Water · 7.0 km by river above Chafford · 2025: 47 spills, 506 h
Groombridge WwpsNot discharging Southern Water · into River Grom · 6.9 km by river above Chafford · 2025: 21 spills, 199 h
Tunbridge Wells South WwTWStatus unknown Southern Water · into The River Grom · 6.9 km by river above Chafford · 2025: 50 spills, 167 h
Tunbridge Wells South WwTWNot discharging Southern Water · into The River Grom · 6.9 km by river above Chafford · 2025: 52 spills, 536 h
Chafford Lane Fordcombe CEONot discharging Southern Water · into The River Medway · 500 m by river above Chafford · 2025: 0 spills, 0 h
CSO Pellings WoodNot discharging Southern Water · into Freshwater River · 15.0 km by river above Hendal Bridge · 2025: 29 spills, 100 h · placed on the river by its position alone
Alderbrook Way CSONot discharging Southern Water · into Jarvis Brook · 14.5 km by river above Hendal Bridge · 2025: 3 spills, 2.9 h
Alderbrook Way CSONot discharging Southern Water · into Jarvis Brook · 14.5 km by river above Hendal Bridge · 2025: 3 spills, 1.5 h
Jarvis Brook CSONot discharging Southern Water · into Jarvis Brook · 12.6 km by river above Hendal Bridge · 2025: 12 spills, 74 h
Redgate Mill Crowborough WwTWNot discharging Southern Water · into Eridge Stream · 8.2 km by river above Hendal Bridge · 2025: 0 spills, 0 h
Redgate Mill Crowborough WwTWNot discharging Southern Water · into Eridge Stream · 8.2 km by river above Hendal Bridge · 2025: 44 spills, 491 h
Between Colliers Land Bridge and Leigh Flood Storage Area2 overflows
Penshurst WwTWNot discharging Southern Water · into River Medway · 5.7 km by river above Leigh Flood Storage Area · 2025: 61 spills, 350 h
Enfield Road Leigh WpsStatus unknown Southern Water · into The River Medway · 1.8 km by river above Leigh Flood Storage Area · 2025: 0 spills, 0 h
River Eden, above Vexour Bridgejoins the Eden Tributary Medway1 overflow
Edenbridge WwTWNot discharging Southern Water · into River Eden · 9.1 km by river above Vexour Bridge · 2025: 48 spills, 416 h
River Eden, above Edenbridgejoins the Eden Tributary Medway4 overflows
Godstone WwTWNot discharging Southern Water · into Gibbs Brook · 15.6 km by river above Edenbridge · 2025: 21 spills, 163 h
Oxted WwTWNot discharging Southern Water · into The River Eden · 13.3 km by river above Edenbridge · 2025: 27 spills, 76 h
Oxted WwTWNot discharging Southern Water · into The River Eden · 13.3 km by river above Edenbridge · 2025: 52 spills, 427 h
Lingfield WwTWNot discharging Southern Water · into Ray Brook · 8.0 km by river above Edenbridge · 2025: 38 spills, 350 h
Between Leigh Flood Storage Area and Town Lock5 overflows
Eggpie Lane Leigh CSONot discharging Southern Water · into Unnamed Dicth/Stream · 7.5 km by river above Town Lock · 2025: 21 spills, 92 h · placed on the river by its position alone
Riding Lane Hildenborough CSONot discharging Southern Water · into The Hilden Brook · 6.0 km by river above Town Lock · 2025: 3 spills, 6.3 h
Coldharbour Lane CSONot discharging Southern Water · into The Hilden Brook · 4.9 km by river above Town Lock · 2025: 19 spills, 233 h
Hilden Bridge Pumping StationNot discharging Southern Water · into The Hilden Brook · 1.5 km by river above Town Lock · 2025: 7 spills, 62 h
Hawden Road Tonbridge CSONot discharging Southern Water · into Tributary Of Hilden Brook · 690 m by river above Town Lock · 2025: 4 spills, 17 h
Between Town Lock and Hartlake Bridge6 overflows
North Farm Road Tonbridge Wells CSONot discharging Southern Water · into Tributary Of The River Medway · 10.9 km by river above Hartlake Bridge · 2025: 1 spill, 0.3 h · placed on the river by its position alone
Priory Road Tonbridge O/S 86 CSONot discharging Southern Water · into Botany Stream · 4.7 km by river above Hartlake Bridge · 2025: 30 spills, 86 h
Tonbridge WwTWNot discharging Southern Water · into The Botany Stream · 3.8 km by river above Hartlake Bridge · 2025: 3 spills, 22 h
Tonbridge WwTWNot discharging Southern Water · into The Botany Stream · 3.8 km by river above Hartlake Bridge · 2025: 16 spills, 180 h
Cannon Lane Combined Sewer OverflowNot discharging Southern Water · into The River Medway · 3.7 km by river above Hartlake Bridge · 2025: 40 spills, 195 h
Mill Stream, Tonbridge CSONot discharging Southern Water · into Mill Stream · 2.8 km by river above Hartlake Bridge · 2025: 12 spills, 63 h
Between Hartlake Bridge and Yalding Hampstead Lock2 overflows
Five Oak Green Road Tudeley CEONot discharging Southern Water · into A Trib Of The River Medway · 12.5 km by river above Yalding Hampstead Lock · 2025: 36 spills, 191 h · placed on the river by its position alone
Bourne Bridge CSONot discharging Southern Water · into River Bourne · 9.3 km by river above Yalding Hampstead Lock · 2025: 5 spills, 4.5 h · placed on the river by its position alone
River Bourne, above HADLOW EMGSjoins the Medway above Yalding Hampstead Lock1 overflow
Reeds Lane, Shipbourne CEONot discharging Southern Water · into The River Bourne · 5.1 km by river above HADLOW EMGS · 2025: 13 spills, 89 h · placed on the river by its position alone
River Beult, above Smardenjoins the Medway above Teston2 overflows
High Halden WTWNot discharging Southern Water · 9.8 km by river above Smarden · 2025: 20 spills, 149 h · placed on the river by its position alone
High Halden WwTWNot discharging Southern Water · into Tributary Of River Beult · 9.8 km by river above Smarden · 2025: 26 spills, 211 h · placed on the river by its position alone
River Beult, above Stilebridgejoins the Medway above Teston9 overflows
Cranbrook WwTWNot discharging Southern Water · into The Crane Brook · 27.2 km by river above Stilebridge · 2025: 40 spills, 92 h
Cranbrook WwTWNot discharging Southern Water · into The Crane Brook · 27.2 km by river above Stilebridge · 2025: 43 spills, 347 h
Biddenden WwTWNot discharging Southern Water · into The River Beult · 19.7 km by river above Stilebridge · 2025: 8 spills, 56 h · placed on the river by its position alone
Smarden Wastewater Treatment WorksNot discharging Southern Water · into The River Beult · 18.0 km by river above Stilebridge · 2025: 41 spills, 516 h
Sewage Drain, SmardenNot discharging Southern Water · into Freshwater River · 16.2 km by river above Stilebridge · 2025: 3 spills, 18 h · placed on the river by its position alone
Ulcombe Wastewater Treatment WorksNot discharging Southern Water · into Tributary Of The River Beult · 14.9 km by river above Stilebridge · 2025: 8 spills, 71 h · placed on the river by its position alone
Frittenden WwTWNot discharging Southern Water · into Maplehurst Stream · 12.3 km by river above Stilebridge · 2025: 15 spills, 86 h · placed on the river by its position alone
Headcorn Waste Water StationNot discharging Southern Water · into Freshwater River · 11.2 km by river above Stilebridge · 2025: 29 spills, 241 h · placed on the river by its position alone
Staplehurst WwTWNot discharging Southern Water · into The River Beult · 6.6 km by river above Stilebridge · 2025: 7 spills, 53 h
River Teise, above Stonebridgejoins the Medway above Teston2 overflows
Chequers Pumping StationNot discharging Southern Water · into Freshwater River · 8.2 km by river above Stonebridge · 2025: 34 spills, 245 h · placed on the river by its position alone
Broadford CEONot discharging Southern Water · into Trib Of River Teise · 530 m by river above Stonebridge · 2025: 10 spills, 57 h
River Bewl, above BEWL BRIDGE GSjoins the Teise1 overflow
Tinkers Lane PS, TicehurstNot discharging Southern Water · into Unnamed Trib Of Bewl Water · 5.3 km by river above BEWL BRIDGE GS · 2025: 38 spills, 255 h
Between Teston and East Farleigh Gate Upstream1 overflow
South Street East Barming CEONot discharging Southern Water · into The River Medway · 1.3 km by river above East Farleigh Gate Upstream · 2025: 3 spills, 2.8 h
Between East Farleigh Gate Upstream and Maidstone10 overflows
Harrietsham WwTWNot discharging Southern Water · into The River Len · 15.4 km by river above Maidstone · 2025: 1 spill, 9.7 h
Leeds WwTWNot discharging Southern Water · into Tributary Of River Len · 8.7 km by river above Maidstone · 2025: 1 spill, 0.3 h
Bearsted Wastewater P SNot discharging Southern Water · into River Len · 4.7 km by river above Maidstone · 2025: 9 spills, 14 h
Spot Lane Bearsted CEONot discharging Southern Water · into The River Len · 4.4 km by river above Maidstone · 2025: 0 spills, 0 h
Deringwood Drive Maidstone CEONot discharging Southern Water · into The River Len · 4.0 km by river above Maidstone · 2025: 1 spill, 4.5 h
Tovil Wharf Wastewater PSNot discharging Southern Water · into The River Medway · 1.2 km by river above Maidstone · 2025: 0 spills, 0 h
Albion Place Maidstone CSONot discharging Southern Water · into River Len · 750 m by river above Maidstone · 2025: 0 spills, 0 h
Padsole Lane Maidstone CSONot discharging Southern Water · into The River Len · 630 m by river above Maidstone · 2025: 0 spills, 0 h
King Street Maidstone CSONot discharging Southern Water · into The River Len · 610 m by river above Maidstone · 2025: 3 spills, 0.5 h
Lower Stone Street Maidstone CSONot discharging Southern Water · into The River Len · 210 m by river above Maidstone · 2025: 1 spill, 0.3 h
Between Allington Marina and Allington Lock1 overflow
Boarley Lane Penenden Heath CEONot discharging Southern Water · into Freshwater River · 650 m by river above Allington Lock · 2025: 5 spills, 5.3 h · placed on the river by its position alone
Above Leigh Barrier2 overflows
Hurstwood Tunbridge Wells CEONot discharging Southern Water · into Barden Mill Stream · 14.2 km by river above Leigh Barrier · 2025: 16 spills, 49 h · placed on the river by its position alone
Bidborough WwTWNot discharging Southern Water · into Barden Mill Stream · 11.3 km by river above Leigh Barrier · 2025: 17 spills, 126 h · placed on the river by its position alone
Above ALLINGTON USGS5 overflows
Knightrider Street CSONot discharging Southern Water · into The River Medway · 2.4 km by river above ALLINGTON USGS · 2025: 0 spills, 0 h
Barker Road Maidstone CSONot discharging Southern Water · into The River Medway · 2.3 km by river above ALLINGTON USGS · 2025: 1 spill, 0.1 h
Boxley Road Maidstone CSONo live feed Southern Water · into A Trib Of The River Medway · 1.6 km by river above ALLINGTON USGS · 2025: 0 spills, 0 h
Sandling Lane Maidstone CSONot discharging Southern Water · into River Medway · 1.1 km by river above ALLINGTON USGS · 2025: 0 spills, 0 h
Sandling Lane Maidstone CSONot discharging Southern Water · into River Medway · 1.1 km by river above ALLINGTON USGS · 2025: 0 spills, 0 h
Above E6417 overflows
Horsmonden Road Pumping StationNot discharging Southern Water · into Trib Of The River Teise · 19.7 km by river above E641 · 2025: 12 spills, 50 h
BridgewaysNot discharging Southern Water · into Freshwater River · 18.9 km by river above E641 · 2025: 6 spills, 21 h · placed on the river by its position alone
Furnace Pond CEONot discharging Southern Water · into A Trib Of The River Teise · 18.4 km by river above E641 · 2025: 15 spills, 118 h
Paddock Wood WwTWNot discharging Southern Water · into The Rhoden Stream · 11.1 km by river above E641 · 2025: 22 spills, 156 h · placed on the river by its position alone
Tatt Yalding CEONot discharging Southern Water · into River Beult (Trib Of Medway) · 5.5 km by river above E641 · 2025: 21 spills, 153 h
Yalding Old Works CEONot discharging Southern Water · into Trib Of The River Medway · 4.8 km by river above E641 · 2025: 42 spills, 342 h
Yalding Old Works CEOStatus unknown Southern Water · into Trib Of The River Medway · 4.8 km by river above E641 · 2025: 0 spills, 0 h
Near these gauges, connection not known
Within 3 km of one of the Medway’s gauges in a straight line, but the river map cannot say whether their water reaches it.
Castle Rd Allington PS+storm Tk CEONot discharging Southern Water · into Medway Estuary · 310 m from Allington Lock in a straight line · discharges to the sea, an estuary or tidal water · 2025: 7 spills, 11 h
Castle Rd Allington PS+storm Tk CEONot discharging Southern Water · into Medway Estuary · 310 m from Allington Lock in a straight line · discharges to the sea, an estuary or tidal water · 2025: 7 spills, 16 h
Fordcombe Wastewater Treatment WrksNot discharging Southern Water · into A Trib Of The River Medway · 570 m from Chafford in a straight line · no mapped watercourse close enough to be sure · 2025: 21 spills, 99 h
Hartlake Road Pumping StationNot discharging Southern Water · into Tributary Of River Medway · 1.0 km from Hartlake Bridge in a straight line · no mapped watercourse close enough to be sure · 2025: 5 spills, 19 h
Priory Mill Tonbridge WpsNot discharging Southern Water · into The Somerhill Stream · 1.2 km from Town Lock in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 53 spills, 611 h
Hilden Park Pumping StationNot discharging Southern Water · into Tributary Of The River Medway · 2.0 km from Leigh Flood Storage Area in a straight line · its watercourse is not on the river map · 2025: 19 spills, 74 h
Leigh Road Hildenborough CSONo live feed Southern Water · into A Trib Of The River Medway · 2.0 km from Leigh Flood Storage Area in a straight line · its watercourse is not on the river map · 2025: 0 spills, 0 h
Hall Road Aylesford CSONot discharging Southern Water · into The Medway Estuary (Tidal) · 2.4 km from Allington Lock in a straight line · discharges to the sea, an estuary or tidal water · 2025: 5 spills, 1.8 h
Oxford Road Shepway CSONot discharging Southern Water · into A Trib Of The River Len · 2.6 km from Maidstone in a straight line · its watercourse is not on the river map · 2025: 1 spill, 0.9 h
Coldharbour Lane Pumping StationNo live feed Southern Water · into Tributary Of The Hilden Brook · 2.8 km from Leigh Flood Storage Area in a straight line · no mapped watercourse close enough to be sure · 2025: 44 spills, 521 h
Dated samples taken by the Environment Agency, not live readings. Results are published days to months after the sample is taken, and many points are sampled only a few times a year, or have not been sampled for years.
127 sampling points on the River Medway and the streams that join it above Allington Lock. 59 have a sample from the last 12 months; 85 have any sample banked.
Sampled most recently, anywhere on the Medway and its streams:
Moat Farm Eden BrookHookstile Gully · 9.4 km above EdenbridgeLast sampled 29 Sep 2026 · 9 days agoOxygen 71.6% Jul 2026Temp 22 °C Jul 2026pH 7.62 Jul 2026Ammonia below 0.03 mg/l Jul 2026
England's samples only. Each count opens the list of those points, nearest first, with the date of each one’s latest sample (the gauge’s “Upstream of here” list).
FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
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