Clean and well-maintained water storage tanks are essential to safe building operation. For MCSTs and building owners in Singapore, annual water-tank inspection, maintenance and certification are an important regulatory responsibility.

Why water-tank maintenance matters

Water storage tanks form part of a building’s potable-water service installation. Regular inspection and washing help identify sediment, debris, damaged covers, leakage, corrosion, poor tank security and incomplete maintenance records.

The annual PUB requirement

PUB requires the responsible party for a water service installation with a storage tank to engage a Licensed Plumber at least once every 12 months to inspect the tank and, where necessary, clean and disinfect it and certify the tank. The process helps confirm that the tank is properly maintained, secure and suitable for storing water for human consumption.

A practical water-tank washing workflow

1. Schedule and plan

Confirm the tank location, isolation and drainage requirements, access route, operational dependencies, notifications, risk assessment and safe work procedure.

2. Inspect and clean

Carry out controlled isolation and cleaning. Record defects such as leakage, corrosion, damaged covers or unsecured access points.

3. Water-sample testing

Water samples should be sent to a Singapore Accreditation Council–SINGLAS accredited laboratory for the required potable-water-quality tests.

4. Licensed Plumber certification and PUB submission

Keep cleaning records, water-test reports, defect rectification records and Licensed Plumber documentation together with the annual submission confirmation and next due date.

Safety and operational planning

Tank washing may involve work at height, restricted access, wet surfaces, electrical equipment near water and chemical handling. The work must be planned with suitable permits, risk assessments, safe work procedures, trained personnel and supervision for the actual site conditions.

How ISS supports building owners

Intelligence Solution & Service Pte. Ltd. supports clients with water-tank washing coordination, site and access planning, safety documentation, defect reporting, water-test tracking and records organisation. The appointed Licensed Plumber remains responsible for the statutory inspection, certification and submission process.

Plan early for safe, documented water-tank maintenance. Contact ISS for practical building-services maintenance coordination and support.

Regulatory requirements may change. Building owners and MCSTs should confirm current PUB requirements and engage the appropriate Licensed Plumber for annual inspection, certification and submission.