Legionella Risk Assessments For Car And Lorry Washes

Vehicle washes are subject to legislation regarding Legionella control and appropriate assessment and management of risks.  These vehicle washes include those for Car And Lorry sized vehicles, car washes (those found in fuel stations and stand-alone car wash machines), lorry washes, bus washes (often located at public transport or private coach hire depots) and train wash systems.

Systems either collect water and re-use it or is discharged after initial use.  The amount of cover a vehicle wash has is deemed of little significance when evaluating risk.


Legionella Control & Risk Assessments
We can assist with risk assessments, recommendations and control regimes, which may be particularly useful to managers of sites where the addition of a vehicle wash is a recent event or where you have cause for concern about the effectiveness of previous maintenance and control regimes. Such schedules can include:

Checking The Water Supply

This includes checking whether water used in the car or lorry wash system is of a temperature which makes Legionella growth more likely. If so, further control measures can be recommended. Additional advice can be given as a result of tests to check for suitable cleanliness, filtration and pre-treatment where required where process water is used. A suitable biocide may be required for example.

Microbial Control

Where dosing systems are appropriate, chemical consumption levels and bacteria levels present can be tested. Recommendations can be made on the use of suitable biocides and whether they are suitable for use alongside other chemicals in the vehicle wash system. Appropriate records can be generated as a result.


Chemical dosing equipment
A maintenance schedule can be created to ensure chemical dosing equipment is kept in good working order. Equipment should be kept free from corrosion, hydrocarbons and in good, clean condition. Records are to be kept of work done to keep equipment in good working order, repairs and checks carried out.

Increased water temperature
Temperatures between 20 – 46 degrees C are ideal for the proliferation of Legionella bacteria and as such should be avoided if possible. Aspects of the system which can result in water temperature increases and inefficiencies can be checked for and addressed where possible.

Insulation and sun screening of pipework and tanks may be required. Variations in temperature are assessed as part of a legionella risk assessment.


Inspection, Cleaning & Disinfection
Assessments of the suitability of current cleaning regimes, including their regularity, can form part of our service. This includes the procedures and regularity of cleaning and disinfection of collection and interceptor tanks.

Release of aerosols
Risk assessments will assess the extent of risks presented by the release of aerosols and likelihood of contact with public and staff. Where appropriate recommendations will be made to reduce the extent to which people may be exposed to aerosols as a result of the vehicle wash. These may include modifications to design or processes.

Sampling & Testing for Legionella
Legionella testing and sampling can be routinely carried out to ensure consistent compliance with legislation and guidelines.

Accurate record keeping including details of routine maintenance, checks, chemical dosing, temperature checks, legionella testing, silt removal and training should be kept on an ongoing basis as part of any legionella control regime.


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