# L8 legionella: Legionella Control Duty Rules

> The Legionella Control Duty Rules carries 1 published figure read from 2 sources' own pages, from 7 to 7 year, read 15 September 2026.

Asbestos Survey Cost · https://asbestossurveycost.co.uk/datasets/legionella-control-duty-rules/ · computed 2026-09-15

**Median of the published figures:** 7 year (range 7 to 7 year; 1 sources with a figure; 2 of 21 sources read publish one).

2 of the 21 named sources read in full publish a figure; 19 publish none, read 15 September 2026.

## By control-parameter

| Breakdown | Median | Range | Sources |
|---|---|---|---|
| control-parameter landlord-duty | 7 year | 7 to 7 year | 1 |
| control-parameter shutdown-trigger | 5 day | 5 to 5 day | 1 |

## Every figure, with its source

One row per source: the figure the source's own page publishes, the page, and the day it was read.

| Source | Figure | Breakdown | Read |
|---|---|---|---|
| [HSE legionella: landlords' responsibilities](https://www.hse.gov.uk/legionnaires/legionella-landlords-responsibilities.htm) | 7 year | landlord-duty | 2026-09-12 |
| [HSE HSG274 Part 1, evaporative cooling systems](https://www.hse.gov.uk/pubns/priced/hsg274part1.pdf) | 5 day | shutdown-trigger | 2026-09-12 |

## The sentence each figure was read from (2)

- [HSE legionella: landlords' responsibilities](https://www.hse.gov.uk/legionnaires/legionella-landlords-responsibilities.htm), read 2026-09-12: "A landlord is anyone who rents out a property they own under a lease or a licence that is shorter than 7 years."
- [HSE HSG274 Part 1, evaporative cooling systems](https://www.hse.gov.uk/pubns/priced/hsg274part1.pdf), read 2026-09-12: "where shutdown is for more than 5 days);"

## Read in full, publishes no figure

- [HSE ACOP L8, Legionnaires' disease: the control of legionella bacteria in water systems](https://www.hse.gov.uk/pubns/books/l8.htm), read 2026-09-11: read in full and no accepted figure on the page
- [HSE legionnaires' disease index](https://www.hse.gov.uk/legionnaires/), read 2026-09-11: read in full and no accepted figure on the page
- [HSE hot and cold water systems](https://www.hse.gov.uk/legionnaires/hot-and-cold.htm), read 2026-09-12: read in full and no accepted figure on the page
- [HSE hot and cold water systems - things to consider](https://www.hse.gov.uk/legionnaires/things-to-consider.htm), read 2026-09-12: read in full and no accepted figure on the page
- [HSE what you must do - keeping records](https://www.hse.gov.uk/legionnaires/what-you-must-do/keeping-records.htm), read 2026-09-12: read in full and no accepted figure on the page
- [HSE cooling towers and evaporative condensers](https://www.hse.gov.uk/legionnaires/cooling-towers.htm), read 2026-09-12: read in full and no accepted figure on the page
- [HSE spa pools](https://www.hse.gov.uk/legionnaires/spa-pools.htm), read 2026-09-12: read in full and no accepted figure on the page
- [HSE managing legionella in health and social care](https://www.hse.gov.uk/healthservices/legionella.htm), read 2026-09-11: read in full and no accepted figure on the page
- [HSENI, L8 ACOP as it applies in Northern Ireland](https://www.hseni.gov.uk/publications/l8-legionnaires-disease-control-legionella-bacteria-water-systems-gb-acop-approved-use), read 2026-09-12: read in full and no accepted figure on the page
- [CDC toolkit: developing a Legionella water management program](https://www.cdc.gov/control-legionella/php/toolkit/wmp-toolkit.html), read 2026-09-12: read in full and no accepted figure on the page
- [CDC steps to develop a water management program](https://www.cdc.gov/control-legionella/php/wmp/wmp-steps.html), read 2026-09-12: read in full and no accepted figure on the page
- [CDC overview of water management programs](https://www.cdc.gov/control-legionella/php/wmp/index.html), read 2026-09-12: read in full and no accepted figure on the page
- [CDC toolkit: controlling Legionella in common sources of exposure](https://www.cdc.gov/control-legionella/php/toolkit/control-toolkit.html), read 2026-09-12: read in full and no accepted figure on the page
- [OSHA Technical Manual section III chapter 7, Legionnaires' disease](https://www.osha.gov/dts/osta/otm/otm_iii/otm_iii_7.html), read 2026-09-12: read in full and no accepted figure on the page
- [New York Codes, Rules and Regulations 10 NYCRR Subpart 4-1, cooling towers](https://regs.health.ny.gov/content/subpart-4-1-cooling-towers), read 2026-09-12: read in full and no accepted figure on the page
- [Employment and Social Development Canada, legionella in the workplace](https://www.canada.ca/en/employment-social-development/services/health-safety/prevention/legionella.html), read 2026-09-12: read in full and no accepted figure on the page
- [HSE HSG274 Part 2, hot and cold water systems](https://www.hse.gov.uk/pubns/priced/hsg274part2.pdf), read 2026-09-12: read in full and no accepted figure on the page
- [HSE HSG274 Part 3, other risk systems](https://www.hse.gov.uk/pUbns/priced/hsg274part3.pdf), read 2026-09-12: read in full and no accepted figure on the page
- [hse.gov.uk](https://www.hse.gov.uk/legionnaires/), read 2026-09-11: read in full and no accepted figure on the page

## Methodology

Every row is a verbatim sentence read from the named source's own page through the estate's fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2). 2 of the 21 named sources that could be read published a usable figure; 19 published none and are recorded as not published, never filled in; 4 could not be read (blocked, dead or unreachable) and count nowhere. The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source in year (a source's median where its page yielded several accepted sentences), so N counts sources, never sentences; 4 candidate sentence(s) were refused by a reviewer with the reason recorded. Derivation as chartered: one row per jurisdiction per control parameter - cold water below 20 C, hot water stored and distributed, sentinel outlet monitoring interval, tank and calorifier inspection interval, review trigger, record retention, notification duty - each quoted verbatim from that jurisdiction's own authority with its effective date; the cross-jurisdiction comparison (which regimes set a fixed review interval and which, like GB, deliberately do not) is the figure, and the risk-assessment template is GENERATED from the ACOP's own required contents rather than written as an opinion; changed-since on every read.

## Sources

- [HSE ACOP L8, Legionnaires' disease: the control of legionella bacteria in water systems](https://www.hse.gov.uk/pubns/books/l8.htm) (the publisher's own terms; quoted for reporting and comment)
- [HSE legionnaires' disease index](https://www.hse.gov.uk/legionnaires/) (the publisher's own terms; quoted for reporting and comment)
- [HSE legionella: landlords' responsibilities](https://www.hse.gov.uk/legionnaires/legionella-landlords-responsibilities.htm) (the publisher's own terms; quoted for reporting and comment)
- [HSE hot and cold water systems](https://www.hse.gov.uk/legionnaires/hot-and-cold.htm) (the publisher's own terms; quoted for reporting and comment)
- [HSE hot and cold water systems - things to consider](https://www.hse.gov.uk/legionnaires/things-to-consider.htm) (the publisher's own terms; quoted for reporting and comment)
- [HSE what you must do - keeping records](https://www.hse.gov.uk/legionnaires/what-you-must-do/keeping-records.htm) (the publisher's own terms; quoted for reporting and comment)
- [HSE cooling towers and evaporative condensers](https://www.hse.gov.uk/legionnaires/cooling-towers.htm) (the publisher's own terms; quoted for reporting and comment)
- [HSE spa pools](https://www.hse.gov.uk/legionnaires/spa-pools.htm) (the publisher's own terms; quoted for reporting and comment)
- [HSE managing legionella in health and social care](https://www.hse.gov.uk/healthservices/legionella.htm) (the publisher's own terms; quoted for reporting and comment)
- [HSENI, L8 ACOP as it applies in Northern Ireland](https://www.hseni.gov.uk/publications/l8-legionnaires-disease-control-legionella-bacteria-water-systems-gb-acop-approved-use) (the publisher's own terms; quoted for reporting and comment)
- [Notification of Cooling Towers and Evaporative Condensers Regulations 1992 (SI 1992/2225)](https://www.legislation.gov.uk/uksi/1992/2225/made) (the publisher's own terms; quoted for reporting and comment)
- [Control of Substances Hazardous to Health Regulations 2002 (SI 2002/2677)](https://www.legislation.gov.uk/uksi/2002/2677/contents/made) (the publisher's own terms; quoted for reporting and comment)
- [CDC toolkit: developing a Legionella water management program](https://www.cdc.gov/control-legionella/php/toolkit/wmp-toolkit.html) (the publisher's own terms; quoted for reporting and comment)
- [CDC steps to develop a water management program](https://www.cdc.gov/control-legionella/php/wmp/wmp-steps.html) (the publisher's own terms; quoted for reporting and comment)
- [CDC overview of water management programs](https://www.cdc.gov/control-legionella/php/wmp/index.html) (the publisher's own terms; quoted for reporting and comment)
- [CDC toolkit: controlling Legionella in common sources of exposure](https://www.cdc.gov/control-legionella/php/toolkit/control-toolkit.html) (the publisher's own terms; quoted for reporting and comment)
- [OSHA Technical Manual section III chapter 7, Legionnaires' disease](https://www.osha.gov/dts/osta/otm/otm_iii/otm_iii_7.html) (the publisher's own terms; quoted for reporting and comment)
- [OSHA Technical Manual directive TED 01-00-015](https://www.osha.gov/enforcement/directives/ted-115-ch-1) (the publisher's own terms; quoted for reporting and comment)
- [New York Codes, Rules and Regulations 10 NYCRR Subpart 4-1, cooling towers](https://regs.health.ny.gov/content/subpart-4-1-cooling-towers) (the publisher's own terms; quoted for reporting and comment)
- [Employment and Social Development Canada, legionella in the workplace](https://www.canada.ca/en/employment-social-development/services/health-safety/prevention/legionella.html) (the publisher's own terms; quoted for reporting and comment)
- [HSE HSG274 Part 2, hot and cold water systems](https://www.hse.gov.uk/pubns/priced/hsg274part2.pdf) (the publisher's own terms; quoted for reporting and comment)
- [HSE HSG274 Part 1, evaporative cooling systems](https://www.hse.gov.uk/pubns/priced/hsg274part1.pdf) (the publisher's own terms; quoted for reporting and comment)
- [HSE HSG274 Part 3, other risk systems](https://www.hse.gov.uk/pUbns/priced/hsg274part3.pdf) (the publisher's own terms; quoted for reporting and comment)
- [CDC water management program toolkit (PDF)](https://www.cdc.gov/control-legionella/media/pdfs/toolkit.pdf) (the publisher's own terms; quoted for reporting and comment)
- [hse.gov.uk](https://www.hse.gov.uk/legionnaires/) (the publisher's own terms; quoted for reporting and comment)

## Cite or embed

- The Legionella Control Duty Rules carries 1 published figure read from 2 sources' own pages, from 7 to 7 year, read 15 September 2026.
- 2 of the 21 named sources read in full publish a figure; 19 publish none, read 15 September 2026.
- Legionella Control Duty Rules, control-parameter landlord-duty: median 7 year across 1 source, read 15 September 2026.
- Legionella Control Duty Rules, control-parameter shutdown-trigger: median 5 day across 1 source, read 15 September 2026.

Cite as: "Asbestos Survey Cost Legionella Control Duty Rules", updated 2026-09-15, https://asbestossurveycost.co.uk/datasets/legionella-control-duty-rules/.

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