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Conditions are worth watching: the Environment Agency has a Flood Alert in force for Tidal Thames riverside from Putney Bridge to Teddington Weir — flooding is possible from 02:15 AM to 04:15 AM on Saturday 10th October. Flooding is possible — be prepared and keep an eye on updates.
Updated 2026-10-09 18:46:07 UTC · Official GOV.UK warnings · Flood preparation & help guide
Carshalton is a town, with a historic village centre, in south London, England, within the London Borough of Sutton. It is situated around 9.5 miles (15.3 km) southwest of Charing Cross and around 1.2 miles (1.9 km) east of Sutton town centre, in the valley of the River Wandle, one of the sources of which is Carshalton Ponds in the south of the village. Prior to the creation of Greater London in 1965, Carshalton was in the administrative county of Surrey.
Towns and villages near Carshalton with a page of their own: the homes in a flood risk area there, the nearest river gauges, and recorded floods.
Croydon · Purley · Wimbledon · Epsom · Surbiton · Clapham
Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0.
The nearest watercourse on the river map is an unnamed stream, about 70 m from the middle of Carshalton's gauges. It flows into the River Wandle about 950 m downstream.
A gauge downstream shows water that has already passed this point; one upstream sees it first. Distances along the river are from the point on an unnamed stream nearest the middle of Carshalton's gauges. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.
Carshalton is monitored by 1 Environment Agency river level station on the River Wandle, in Greater London. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Wandle is monitored by 1 station (Carshalton Ponds). Each station records water levels continuously, with data synced to FloodRadar every 5 minutes.
There are 8 Environment Agency flood warning areas within 10km of Carshalton. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: River Wandle at Beddington Park including Hackbridge and Waddon, London Boroughs of Sutton and Croydon; Areas at risk of groundwater flooding in the Caterham Bourne catchment including Caterham, Whyteleafe, Kenley, Purley, South Croydon, Beddington and Carshalton; River Wandle at Morden, including Morden Hall Park, London Borough of Merton; Pyl Brook at North Cheam including Kimpton Industrial Estate, London Boroughs of Merton and Sutton.
There are 2 storm overflows within 5km of Carshalton. None has a live status right now, so whether any is discharging is not known. Enable "Sewage" on the map above to see their locations.
Each has its own page of live status and past discharges:
If flooding is forecast in Carshalton, call Floodline on 0345 988 1188 for the latest information. Move valuables upstairs, turn off gas and electricity if safe to do so, and avoid walking or driving through flood water. Sign up for flood warnings on any station page above to receive email alerts when water levels rise. For emergency numbers, a preparation checklist and insurance guidance, see our flood help & preparation guide.
Carshalton gets about 703 mm of rain a year on average (wettest month November, 78 mm; driest March, 43 mm). That is 40% drier than the UK as a whole, which averages 1,163 mm a year. See the rain gauges →
A thirty-year average for the area, not a forecast and not a flood risk on its own. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 2.3 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of the town centre — most recent first. These are records of mapped extents, not a full list of floods. See them on the map →
Records, not floods: no outline on the record is not evidence a place has not flooded.
Current verdict: Watch. Conditions are worth watching: the Environment Agency has a Flood Alert in force for Tidal Thames riverside from Putney Bridge to Teddington Weir — flooding is possible from 02:15 AM to 04:15 AM on Saturday 10th October. Flooding is possible — be prepared and keep an eye on updates.
Carshalton has river level monitoring on River Wandle — 1 monitoring station in total.
Use the GOV.UK Check for Flooding service (check-for-flooding.service.gov.uk) or call Floodline on 0345 988 1188 (24 hours). You can also set up free FloodRadar email or browser alerts from any station page above.
Follow official advice: move valuables and vehicles to safety, never walk or drive through flood water, turn off gas and electricity if safe, and check on vulnerable neighbours. See our flood preparation guide at floodradar.co.uk/flood-help.
No recorded flood outline is mapped around the Carshalton town centre means no flood was mapped here, which is not evidence none happened: the Environment Agency mapped only some floods, mapping effort rose sharply after about 2000, and surface-water flooding is largely absent from this record. FloodRadar has separately logged 10 flood warnings or alerts for the Greater London area since February 2026. See the flood history link below.
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