Exams / HS&E PLUM / Water systems and legionella / Question 6
HS&E PLUM practice question: Water systems and legionella (6 of 6) E. Specialist: Plumbing (JIB) A free question from our original HS&E PLUM practice exam. Try it, then open the answer to see why each option is right or wrong.
Last verified October 2026 against HSE guidance and the law ·How we write our questions
During a long refurbishment, some taps are still needed but are hardly ever used.
What does HSE say?
Choose one answer.
A A. Cover the spouts with tapeB B. Turn the hot water down to save energyC C. Flush them through regularlyD D. Leave them alone until handoverShow the answer and explanation Answer: C
A. Wrong: Wrong. That doesn't stop water stagnating.B. Wrong: Wrong. Lower temperatures help legionella grow.C. Right: Right. HSE says outlets that are still needed but not regularly used should be flushed through regularly.D. Wrong: Wrong. Stagnant water lets legionella grow.Explanation Flush rarely used outlets regularly, and drain systems that are no longer needed.
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