Cooling tower monthly inspection checklist (legionella control)
Monthly inspection of an evaporative cooling tower for legionella risk control: biocide and inhibitor dosing, bleed-off, dip-slide sample, water appearance, biofilm, drift eliminators, stagnant sections, fan drive, make-up valve and safe access.
17 checkpointsHVACVersion 1Updated Imported once
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Section 1 of 4
Water treatment
Biocide dosing — Biocide dosing pump running and chemical tank not empty
Pass / FailHigh riskInhibitor dosing — Scale and corrosion inhibitor dosing operating, tank level sufficient
Pass / FailBleed-off — Bleed-off working and conductivity within the set range
Pass / FailWater sample — Take the microbiological sample (dip slide) and record it
Done / Not doneHigh riskWater — Appearance of the basin water
Choice- Clear (Conforming)
- Slightly cloudy
- Turbid, foaming or oily (Non-conforming)
- Algae or slime present (Non-conforming)
Section 2 of 4
Legionella risk points
Fill and basin — Any visible biofilm, slime or algae on the fill, basin or louvres?
Yes / NoNon-conforming answer: YesHigh riskBasin — Basin free of sludge, debris and corrosion deposits
Pass / FailDrift eliminators — Drift eliminators in place, complete, not damaged or displaced
Pass / FailHigh riskWater distribution — Water spread evenly over the fill, no blocked nozzles or troughs
Pass / FailStandby sections — Circulate water through standby cells, pumps and idle branches
Done / Not done
Section 3 of 4
Mechanical
Fan — Fan runs without abnormal noise or vibration
Pass / FailFan drive — Gearbox without oil leak and at correct level, or belts correctly tensioned
Pass / FailMake-up water — Make-up valve controls the level, no overflow to drain
Pass / FailCasing — Casing, panels and access doors intact and closed
Pass / Fail
Section 4 of 4
Access and records
Access — Ladders, handrails and platforms secure; fan guard in place
Pass / FailHigh riskLogbook — Update the water treatment and inspection logbook
Done / Not doneRemarks — Observations for the water treatment provider
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Templates are general guidance. They do not replace the manufacturer’s instructions, your site procedures or applicable regulations.
Equipment: HVAC
Industries: Facilities, Manufacturing, Healthcare, Energy and utilities
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