Does Chalfont St Peter flood?

What the Environment Agency's rivers-and-sea flood-risk data says about Chalfont St Peter

Ordnance Survey places 24 postcodes in Chalfont St Peter in the Environment Agency's rivers-and-sea flood-risk dataset (Risk of Flooding from Rivers and Sea). Each postcode is counted once, under the worst band any of its properties reaches; together they hold 270 properties in the EA dataset's likelihood bands.

This dataset covers flooding from rivers and the sea only — one of five flood sources. Surface water, groundwater, sewers and reservoirs are assessed separately, so a postcode missing from it is not proof that a place cannot flood. The band describes the land around properties (allowing for defences), not any single address and not today's conditions.

Rivers and live river levels near Chalfont St Peter

Environment Agency gauges within 10 km of Chalfont St Peter watch River Misbourne, River Colne, River Chess, Frays River, Cannon Brook, River Pinn, River Gade.

• Denham Lodge Structure
  River Misbourne · 6.1 km away 0.08 m
  controlled by a sluice or weir · 24 min ago
• Denham Colne
  River Colne · 6.6 km away 0.16 m
  normal range · steady · 24 min ago
• Willowbank Structure
  River Colne · 7.1 km away 0.86 m
  controlled by a sluice or weir · 24 min ago
• Rickmansworth Structure
  River Chess · 7.6 km away 0.10 m
  controlled by a sluice or weir · 24 min ago
• Uxbridge, Fountains Mill
  Frays River · 8.0 km away 0.92 m
  normal range · steady · 24 min ago
• Howletts Lane, Ruislip
  Cannon Brook · 8.3 km away No recent reading
  last reported 26 Oct 2026 10:00
• Moor Lane
  River Colne · 8.3 km away No recent reading
• Ickenham, Swakeleys Road
  River Pinn · 8.4 km away 0.60 m
  normal range · 24 min ago
• Uxbridge, Hercies Road
  River Pinn · 9.0 km away 0.77 m
  normal range · 24 min ago
• Ruislip
  River Pinn · 9.3 km away 0.21 m
  normal range · 24 min ago
• Croxley Green
  River Gade · 9.3 km away 0.10 m
  normal range · 24 min ago
• Iver, Clisbys Bridge
  River Colne · 9.6 km away 0.42 m
  normal range · steady · 24 min ago

Distances are from the middle of Chalfont St Peter's at-risk postcodes. Tidal and structure gauges are shown as readings only — the tide and sluice gates move them, not floods. A gauge with no recent reading shows no level.

Flood warning areas near Chalfont St Peter

15 Environment Agency flood warning areas lie within 10 km of Chalfont St Peter. The EA has issued 160 flood warnings and alerts for them since 2006, most recently on 28 Aug 2026.

• The River Misbourne at The Chalfonts including Chalfont St Giles, Chalfont St Peter and Denham
  no warning on record since 2006 1.5 km
• The River Misbourne at Great Missenden, Amersham and The Chalfonts
  no warning on record since 2006 1.8 km
• The River Colne at Willowbank including Uxbridge Moor
  1 warning or alert since 2006, latest Feb 2014 5.6 km
• The River Colne at Rickmansworth including Batchworth, Money Hill and Maple Cross
  1 warning or alert since 2006, latest Jan 2021 6.0 km
• The River Chess at Loudwater, Rickmansworth
  no warning on record since 2006 7.1 km
• The River Misbourne at Amersham, including Amersham Old Town, from Little Missenden to Chalfont St Giles
  no warning on record since 2006 7.7 km
• The River Chess at Chesham, Chenies and Loudwater
  2 warnings and alerts since 2006, latest Mar 2024 7.7 km
• The River Chess at Chenies, including Latimer and Sarratt
  no warning on record since 2006 8.1 km
• The River Pinn at Ickenham
  1 warning or alert since 2006, latest Jun 2016 8.4 km
• The River Pinn at Ruislip
  2 warnings and alerts since 2006, latest Jan 2024 9.0 km
• The River Pinn at Uxbridge including Hillingdon
  no warning on record since 2006 9.1 km
• The Lower River Colne and Frays River at Uxbridge, West Drayton, Poyle and Stanwell Moor
  39 warnings and alerts since 2006, latest Feb 2026 9.5 km

Recorded floods near Chalfont St Peter

Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of Chalfont St Peter, most recent first. Records, not floods: no outline on the record is not evidence a place has not flooded. See them on the map →

• 2 Mar 2024 — EA06MarchSpring2024
• 23 Feb 2024 — EA06FebruaryWinter2024 Main river
• 31 Jan 2014 — ea06FebruaryWinter2014 Main river
• 6 Jan 2014 — ea06JanuaryWinter2014 Sewer
• 23 Nov 2013 — Winter 2013/2014 Other
• 1 Oct 2001 — 06OctoberAutumn2001 Other
• 1 Jan 1987 — 06JulySummer1987 Main river
• 1 Jan 1987 — 06OctoberAutumn1987 Other

Rainfall near Chalfont St Peter

Chalfont St Peter gets about 708 mm of rain a year on average (wettest month November, 80 mm; driest March, 45 mm). That is 39% drier than the UK as a whole, which averages 1,163 mm a year. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 3.0 km from the place centre.

The nearest rain gauge, Rainfall station (9.5 km away), recorded 2.4 mm in the last 24 hours and 3.2 mm in the last 7 days (latest reading 24 min ago).

At-risk postcodes in Chalfont St Peter

Every postcode Ordnance Survey places in Chalfont St Peter that appears in the EA's rivers-and-sea dataset, worst band first. Each links to its own flood-risk page.

Medium likelihood (4)

Low likelihood (20)

Postcode districts

Sources

FloodRadar summarises public flood data. It is not a flood-risk survey of any property, and it does not replace official GOV.UK flood warnings or the GOV.UK long-term flood risk service.