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Does my water system need a legionella risk assessment?

Equipment and work · Question 1 of 3

Which water systems or premises are involved?

Choose every relevant system or use. The assessment must cover the real water assets and people who can be exposed.

Business or industry

Which water systems or premises are involved?

Commercial hot and cold waterOffices, shops, factories, warehouses or public buildingsRented housing or HMOA landlord or managing agent controls the domestic water systemCare or healthcare premisesResidents or patients can have greater susceptibilityHotel, hospitality or guest accommodationBedrooms, showers and variable occupancy increase the asset countLeisure, pool or spa systemSpa pools and wet leisure systems need specialist assessmentCooling tower or evaporative condenserAn evaporative cooling system has a separate HSG274 control routeOther risk water systemVehicle wash, humidifier, misting, dental, industrial or process systemNo water system under our controlUse only after confirming no premises or work activity creates exposure responsibilityWater system is uncertainOwnership, assets or system layout needs checking

Choose an industry and at least one equipment or work type.

More help with Legionella risk assessments

Use these when you need more detail before appointing someone. This questionnaire is decision support, not a professional assessment or a legal determination.

Buying toolkit and quote checklist →Supplier evidence directory →

Guides, technical explanations and references

Duty and technical sources

UK employers and people in control of premises must assess and control legionella exposure risks under health and safety law and COSHH. HSE ACOP L8 explains how those duties apply to water systems.

HSE ACOP L8 — Legal duties, risk assessment and control principles
HSE HSG274 — Technical guidance for cooling, hot and cold, and other water systems
HSE employer responsibilities — Practical dutyholder steps and competence

Published price evidence

Birmingham Water Solutions — Publishes £250 to £450 for a stated small low-complexity building and higher bands for larger systems.
Aqua Legion UK — Publishes set-price packages from £295 plus VAT based on location, complexity and time.
uRisk — Publishes commercial assessments from £300 plus VAT and a stated range for larger or more complex sites.

Control sequence

Assessment connects water assets to operating controls

The responsible person needs a mapped system, evidence of risk conditions and a written scheme that defines what happens between assessments.

Check against HSE ACOP L8

01Water sourceMains, storage, heating, cooling or process supply
02System assetsTanks, calorifiers, loops, pipework and outlets
03ExposureAerosols, system users and susceptible people
04ControlsTemperature, turnover, cleaning, monitoring and action limits
05Written schemeNamed duties, tasks, records, corrective action and review

Evidence a competent appointment should leave visible

System schematic and asset register
Risk and exposure findings
Control measurements and records
Written scheme and corrective actions