Water Tank Cleaning Checklist

Use this Water Tank Cleaning Checklist to plan isolation, assess hazards, confirm PPE, manage sanitation, and document safe, compliant water tank cleaning.

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Water Tank Cleaning Checklist



Planning And Notification

1. A written cleaning and disinfection method statement is in place


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2. Occupants have been notified before the water supply is interrupted


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3. Alternative water arrangements are provided for the duration of the work


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4. The contractor's competence and training records have been verified


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5. The tank is identified by asset number and location on the record


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Isolation And Preparation

1. The inlet valve is closed and the supply to the tank is isolated


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2. Pumps and electrical equipment serving the tank are switched off and locked out


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3. The area around the access hatch is cleaned before it is opened


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4. The tank is drained through the outlet or by submersible pump


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5. Downstream outlets are isolated to keep sediment out of the distribution pipework


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Confined Space And Crew Safety

1. Entry is treated as confined space work with a permit issued


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2. Oxygen and gas readings are taken before and during entry


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3. A trained attendant is stationed at the hatch throughout


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4. Rescue arrangements and retrieval equipment are in place before entry


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5. The crew wear clean protective clothing and footwear not used elsewhere


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6. Ventilation is provided during disinfection to prevent chlorine gas building up


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Cleaning

1. Sediment depth is measured and recorded before cleaning begins


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2. Sludge and standing water are removed by hand or vacuum


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3. Walls, floor and roof are scrubbed or washed to remove biofilm and scale


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4. Only cleaning agents approved for potable water contact are used


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5. Debris, insects or animal remains found in the tank are recorded and reported


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6. The tank is rinsed until free of loosened deposits and cleaning agent


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Disinfection

1. The disinfectant is a chlorine solution approved for potable water use


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2. Concentration follows the supplier's specification for premise plumbing materials


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3. The full internal surface including the roof is wetted with the solution


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4. The required contact time is achieved and recorded with start and end times


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5. Free chlorine residual is measured at the end of the contact period


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6. Downstream pipework and outlets are flushed with disinfected water where required


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Flushing, Dechlorination And Disposal

1. The tank is drained and refilled until chlorine taste and odor have cleared


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2. Highly chlorinated water is dechlorinated before discharge


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3. Discharge meets the requirements of the receiving sewer or watercourse


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4. Outlets remain out of use until flushing is complete


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5. Free chlorine at outlets is back to normal supply levels before use resumes


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Structural And Component Inspection

1. The tank structure is free from cracks, leaks and corrosion


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2. Internal linings and coatings are intact with no flaking or blistering


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3. The access hatch is undamaged, close fitting and lockable


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4. Vents are screened and the screens are intact


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5. The overflow is screened and is separate from the vent


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6. Inlet and outlet valves operate correctly and do not leak


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7. The float or level control operates at the correct level


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Verification And Return To Service

1. A bacteriological sample has been taken after refilling


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2. Sample results show no coliform bacteria present


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3. Chlorine residual at the tank outlet is within the normal operating range


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4. The tank is not returned to service until satisfactory results are received


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5. Water clarity, taste and odor are acceptable before use resumes


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Records

1. The cleaning date and the contractor or operative are recorded


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2. Sediment depth, cleaning method and disinfection method are recorded


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3. Laboratory results are attached to the cleaning record


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4. The next cleaning date is scheduled and recorded


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Checklist by GoAudits.com – Please note that this checklist is intended as an example. We do not guarantee compliance with the laws applicable to your territory or industry. You should seek professional advice to determine how this checklist should be adapted to your workplace or jurisdiction.

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