Water hygiene services

Tank inspections & cleaning.

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What are tank inspections and cleaning?

Tank inspections and cleaning keep your cold water storage tanks and other vessels clean, well-maintained and fit for purpose. Over time, tanks can accumulate sediment, debris, biofilm and scale, creating conditions in which bacteria can thrive. Regular inspection and cleaning are core control measures under ACoP L8 and HSG274.

Our teams carry out visual and internal inspections, condition reporting, and full cleaning and disinfection of storage tanks, all of which are recorded with photographic evidence. We assess the integrity of lids, screens, insulation and overflows, and advise on any repairs or improvements needed to protect water quality and maintain compliance.

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Why choose Complii?

How we can help.

What are tank inspections and cleaning?

Protected water quality

Removing sediment, biofilm and scale keeps stored water clean and reduces the conditions that allow bacteria to grow.

Compliance evidence

Inspection and cleaning records, supported by photographs, demonstrate that this key control measure is being maintained.

Condition insight

We assess lids, screens, insulation and overflows, flagging integrity issues before they compromise water quality.

Thorough disinfection

Cleaning is followed by disinfection to recognised standards, restoring your tank to a safe, hygienic condition.

Minimal disruption

Works are planned around your operations to keep any interruption to supply short and predictable.

Clear recommendations

Where repairs or upgrades are needed, we set out practical options to protect the asset and support long-term compliance.

You questions answered.

Cold water storage tanks should be inspected regularly, with cleaning and disinfection carried out when an inspection indicates they are needed, for example, where sediment, debris, or biofilm is present. Your risk assessment will set the appropriate regime.
A visual and internal inspection of the tank’s condition, water quality, and the integrity of lids, screens, insulation, and overflows, with photographic evidence.
Cleaning usually requires taking the tank offline for a period. We plan to work around your operations to keep any interruption short and predictable, and we can discuss temporary arrangements where needed.
Yes. Cleaning is followed by disinfection to recognised standards, and the tank is returned to service in a safe, hygienic condition.
We report the issue clearly and recommend practical repairs or improvements, and can carry out the remedial works to protect water quality and maintain compliance.

News & insights

News / July 9, 2026

Acquisitions / July 9, 2026

Complii strengthens water compliance offering with acquisition of Sweetbriar Limited

Complii announced the acquisition of Sweetbriar Limited, a specialist provider of water hygiene, water treatment and legionella control services. Based in Chandlers Ford, Hampshire, Sweetbriar brings over two decades of technical expertise and a strong reputation for service-led water compliance to Complii.

Acquisitions / May 22, 2026

News / May 22, 2026

Complii acquires Classic Lifts (Scotland) to grow its lifts and escalators division

Complii, one of the UK’s leading providers of building safety and regulatory compliance services, announced the acquisition of Classic Lifts (Scotland) Limited, a highly regarded specialist lift services provider based in Glasgow. The acquisition represents a significant milestone in Complii’s growth journey, introducing Lifts and Escalators as a dedicated new compliance service line within its expanding portfolio.

Acquisitions / May 15, 2026

News / May 15, 2026

Complii continues Lifts and Escalators expansion with acquisition of The Escalator Company

Complii, one of the UK’s leading providers of building safety and regulatory compliance services, announced the acquisition of The Escalator Company, a specialist in escalator, lift and travelator servicing, maintenance, refurbishment and installation. Based in Rochester, Kent, The Escalator Company brings over two decades of experience and a strong reputation for engineering excellence to Complii.

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Compliance with confidence.

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