No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-08-24 21:03:22 UTC · Official GOV.UK warnings · Flood preparation & help guide
London Colney is a village and civil parish in Hertfordshire, England. It is located to the north of London, close to Junction 22 of the M25 motorway.
London Colney is monitored by 1 Environment Agency river level station on the River Colne, in Hertfordshire. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Colne is monitored by 1 station (London Colney). 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 London Colney. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: The River Colne at London Colney including Colney Street and Broad Colney; The Upper River Colne and Radlett Brook at Colney Heath, London Colney, Borehamwood and Radlett; The River Colne at Colney Heath including North Mymms; The Radlett Brook at Radlett.
If flooding is forecast in London Colney, 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.
Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of the town centre — most recent first. See them on the map →
Current verdict: Normal. No official flood warning is active nearby and the closest river stations are within normal ranges.
London Colney has river level monitoring on River Colne — 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.
Yes — the Environment Agency's Recorded Flood Outlines dataset shows 32 recorded flood extents around the town centre since 1946, most recently in 2014. Absence of a record does not mean a place has never flooded. See the flood history link below.
