Environment Agency013WATMEWLWGtr Mancs Mersey and Ches
Mersey Estuary from Liverpool and Wirral to Widnes: flood history since 2015
The Environment Agency has issued 50 flood alerts for Mersey Estuary from Liverpool and Wirral to Widnes since 22 Mar 2015, most often in September; the busiest year was 2024 (9).
Flood alerts only
The flood area
- Flood area
- Mersey Estuary from Liverpool and Wirral to Widnes
- Code
- 013WATMEWLW
- Environment Agency area
- Gtr Mancs Mersey and Ches
- County
- Cheshire West and Chester, Halton, Knowsley, Liverpool, Sefton, Wirral
- River or sea
- Mersey Estuary
- First in the history
- 22 Mar 2015
- Latest in the history file
- 4 Apr 2026
- Current status
- check-for-flooding.service.gov.uk (the Environment Agency's live page)
Flood alert, flood warning, severe flood warning: what each means
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.
How many alerts and warnings a year?
Flood alerts, flood warnings and severe flood warnings (updates not counted), by year. 2026 runs to the end of June.
The numbers
| Year | Alerts | Warnings | Severe |
|---|---|---|---|
| 2026 | 1 | 0 | 0 |
| 2025 | 2 | 0 | 0 |
| 2024 | 9 | 0 | 0 |
| 2023 | 4 | 0 | 0 |
| 2022 | 1 | 0 | 0 |
| 2021 | 3 | 0 | 0 |
| 2020 | 8 | 0 | 0 |
| 2019 | 7 | 0 | 0 |
| 2018 | 2 | 0 | 0 |
| 2016 | 7 | 0 | 0 |
| 2015 | 6 | 0 | 0 |
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.
When in the year?
All alerts and warnings since 2015 by month.
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.
Before July 2026: the latest in the history file
| Date | Level |
|---|---|
| 4 Apr 2026 | Flood alert |
| 8 Oct 2025 | Flood alert |
| 9 Sep 2025 | Flood alert |
| 19 Oct 2024 | Flood alert |
| 16 Oct 2024 | Flood alert |
| 19 Sep 2024 | Flood alert |
| 20 Aug 2024 | Flood alert |
| 9 Apr 2024 | Flood alert |
| 13 Mar 2024 | Flood alert |
| 12 Mar 2024 | Flood alert |
| 11 Mar 2024 | Flood alert |
| 12 Feb 2024 | Flood alert |
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.