Rank: Forum user 
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We are in the process of installing 2 new showers, when do I have to undertake a new legionella risk assessment?
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Rank: Super forum user 
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Ongoing.
Just the decision to install extra showers is a decision that should be considered within a risk assessment framework. You almost certainly have.
I think we can all be guilty of getting a bit tied in to risk assessments being a piece of paper when actually its a process. The paper is merely us recording our thoughts and findings.
So you should probably record somewhere why you're installing two new showers, where they are going and what the consequences might be. If you want a bit of paper saying 'legionella risk assessment' then create that as per your other risk assessments. Most likely after installation and testing your original assumptions to ensure control measures are effective.
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Rank: Forum user
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We have a risk assessment in place which will be revised to include the new showers, my question is do I have to get an independent analysis, and possibly sampling, given that its new showers that spray and if so, when do I have to do this.
I'm working on the basis that's its not straight away as the showers have only just been put to use, but is there a timescale for this?
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Rank: Super forum user
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If you have an existing Legionella RA in place, it may just require the original assessor to review the assessment.
My advise is to - flush the showers on a weekly basis and record the activity and disinfect the showerheads every 3 months and to record this activity also, as these are the normal legionella control measures for showers.
Just another note - if the showers have TMV's fitted these must be checked and maintained.
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Rank: Super forum user
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Not sure what you want to analyse?
The guidance is that there is no need to routinely sample from domestic hot/cold water systems unless you are investigating a known problem. You don't even really need an independent person to review your overall risk assessment - especially if this is just two showers added to an existing system with no known issues. I can come up with a myriad of caveats to that last line but checking that they both reach the required temperature, both get regular use (preferably near daily) and periodic descale and disinfection is absolutely all you need to do the vast majority of the time. Add these checks to your management processes and check that they're doing the job further down the line.
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Rank: Forum user
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I certainly don't see the need to flush the outlets if they're used regularly.
Their regular use may need to be recorded somewhere, but there's no need to flush regularly used outlets.
Graham
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Rank: Super forum user
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Regularly used shower outlets do not need to be flushed, this is correct.
It can sometimes be difficult to know if a shower has been used or not, for example in hotels or large care homes. As a precaution we ensure that our showers are flushed weekly and a record kept as a matter of course. This recommendation is based on a case where a resident of a hotel contracted legionella, it was a room that was tucked away at the back of the hotel and was not used for some time with no controls in place.
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