Environment Agency directory · East of England
Flood warnings and river levels in Hertfordshire
Current warnings are checked live. Monitoring areas, stations and watercourses below are directory records and may be listed even when no warning is in force.
- Designated areas
- 88
- Level stations
- 56
- Named watercourses
- 39
- Directory snapshot
- 6 Aug 2026, 01:13
Live Environment Agency status
Current flood warnings in Hertfordshire
Directory metadata refreshed 6 Aug 2026, 01:13 (UK time). Warning status is requested separately from the EA feed.
Permanent EA coverage
Designated monitoring areas in Hertfordshire
These are predefined places where the Environment Agency can issue a Flood Warning or Flood Alert. The category describes how EA organises the area; it does not show whether an alert is active now. Similar names can refer to different official stretches of the same river.
| Official area name | Watercourse / coast | EA area category |
|---|---|---|
| River Thames at Thames Ditton Island including Boyle Farm Island EA ref 061FWB23DitIslnd | River Thames | Designated warning area Coverage type—not a current warning |
| River Thames at Thames Ditton Island including Boyle Farm Island EA ref 061WAB23DitIslnd | River Thames | Designated alert area Coverage type—not a current warning |
| River Thames from Shepperton to West and East Molesey including Hamm Court, Walton-on-Thames and Sunbury EA ref 061WAF23Shepprtn | River Thames | Designated alert area Coverage type—not a current warning |
| River Ivel from Langford to Blunham, including the rivers Purwell, Hiz, Flit and Hit EA ref 052WAFIVEL | River Ivel | Designated alert area Coverage type—not a current warning |
| Trinity Marsh Ditch at Waltham Cross EA ref 062FWF53Trinity | Trinity Marsh Ditch, Small River Lee | Designated warning area Coverage type—not a current warning |
| The Radlett Brook at Radlett EA ref 062FWF28Radlett | Radlett Brook | Designated warning area Coverage type—not a current warning |
| The Upper River Colne and Radlett Brook at Colney Heath, London Colney, Borehamwood and Radlett EA ref 062WAF28UpColne | River Colne | Designated alert area Coverage type—not a current warning |
| The River Crane at Hillingdon, Southall, Cranford, Feltham and Twickenham EA ref 062WAF36FluCrane | River Crane | Designated alert area Coverage type—not a current warning |
| River Lee at Luton, Harpenden including Wheathampstead and East Hyde EA ref 062WAF46UpperLee | River Lee | Designated alert area Coverage type—not a current warning |
| Beverley Brook at Barnes, London Boroughs of Richmond upon Thames and Wandsworth EA ref 064FWB40Barnes | Beverley Brook | Designated warning area Coverage type—not a current warning |
| Beverley Brook area, including the Pyl Brook, in the London Boroughs of Merton, Sutton, Kingston upon Thames, Richmond upon Thames and Wandsworth EA ref 064WAF40BevBrook | Beverley Brook, Pyl Brook, East Pyl Brook | Designated alert area Coverage type—not a current warning |
| River Thames from the River Brent to the River Crane including East Isleworth and Syon Park EA ref 063FWT23Islewrth | River Thames | Designated warning area Coverage type—not a current warning |
Showing 12 of 88 matching areas
River-level monitoring
Stations and readings in Hertfordshire
Blue points are monitoring instruments—not flood incidents. Open a station for recent readings, time checked and nearby context.
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Kingston
River Thames
Thames from Hurley to Teddington catchment
View readings and location →Bragbury Park
Stevenage Brook
Beane catchment
View readings and location →Colney Street
River Ver
Colne (Upper) catchment
View readings and location →Cheshunt, Trinity Lane
Theobalds Brook
Lower Lee catchment
View readings and location →Cheshunt, Windmill Lane
Small River Lee
Lower Lee catchment
View readings and location →Radlett
Radlett Brook
Colne (Upper) catchment
View readings and location →Trowlock Island
River Thames
Thames from Hurley to Teddington catchment
View readings and location →Hemel Hempstead, Old Fishery Lane
River Bulbourne
Colne (Upper) catchment
View readings and location →Furneux Pelham
River Ash
Ash (Herts) catchment
View readings and location →Molesey Lock
River Thames
Thames from Hurley to Teddington catchment
View readings and location →Hertford, Hartham Park
River Beane
Beane catchment
View readings and location →Rickmansworth
River Chess
Colne (Upper) catchment
View readings and location →Showing 12 of 56 matching stations
Directory index
Watercourses associated with Hertfordshire
Rivers, streams, drains and coastal waters named in EA area or station records. Inclusion does not mean the watercourse is currently high or flooding.
- Ash
- Beane
- Beverley Brook
- Borehamwood Brook
- Dane End Tributary
- East Pyl Brook
- Groundwater
- Hogsmill
- Hogsmill River
- Mimmshall Brook
- Mimram
- Pyl Brook
- Quin
- Radlett Brook
- Rags Brook
- Rib
- River Ash
- River Beane
- River Bulbourne
- River Chess
- River Colne
- River Crane
- River Gade
- River Ivel
Check property-level risk before buying or insuring
Our directory lists 88 Environment Agency warning and alert areas associated with Hertfordshire. The count does not determine the risk to a specific address. Use the postcode checker and official long-term flood-risk service, then confirm cover with your insurer or a qualified professional where necessary.