Official Statistics

Legionellosis in residents of England and Wales: 2024

Reported cases of legionellosis in residents of England and Wales with onset of symptoms in 2024.

• From: UK Health Security Agency
• Published: 20 November 2025

Applies to England and Wales

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Legionellosis in residents of England and Wales: 2024

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Legionellosis in residents of England and Wales: 2024 data

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Legionnaires’ disease is a severe but uncommon form of pneumonia associated with exposure to water systems (natural or man-made) colonised by legionella bacteria.

This report presents the epidemiological data on cases of Legionnaires’ disease reported in residents of England and Wales in 2024.

Previous annual reports from 2017 to 2023 are available.

Published 20 November 2025