How to Read a Water Tank Cleaning Report: What the Technician Should Write and What You Should Ask

A tank is closed, dark and rarely seen by the owner, so what gets written after the visit is the only evidence of what took place. A record does not guarantee quality on its own, but it makes the work reviewable and keeps the crew honest about detail.

In Jeddah sediment builds up quickly in ground tanks because of dust, salts and summer heat. A precise description of what was found helps you pick a sensible interval for the next visit instead of guessing.

You do not need a long formal form. A clear sheet, or a well-organised WhatsApp message with photos, is enough as long as it covers the points described below.

A good record opens with the date, the address and the name of the person who received the crew. These look like formalities, yet they help later when you compare two visits or follow up on a remark.

It then identifies the tank exactly: ground or roof, how many tanks, and roughly what size. In villas with two tanks the record should confirm that both were cleaned, because it is common for only one to be done while everyone assumes the job is complete.

If the building uses a shared tank, ask for that to be written down. Responsibility for follow-up then sits with the residents or the owners association rather than with nobody.

The most valuable part of any record is the description of the starting condition: was there muddy sediment on the floor, a green film on the walls, hard scale, or dirt that came in through the lid? It tells you how neglected the tank had been and whether you need a shorter schedule.

Beware of general phrases. "The tank is clean" means little if the record never says what it looked like before. A useful note gives the place and rough amount, such as sediment near the inlet, or algae on the sun-facing wall of a roof tank.

This description also lets you compare today’s result with what another crew wrote last time, which is the only fair way to judge how fast your own tank gets dirty.

Read the steps in sequence: shut off the supply and drain the water, remove sediment from the bottom, scrub walls and floor, rinse, apply a suitable disinfectant while respecting its contact time, then rinse again and refill. A missing final rinse is the one omission that deserves a direct question.

With a ground tank feeding a roof tank, ask about the order of work between them. Cleaning one and then pumping water into the other before it has been washed spoils the result. We describe that sequence in our guide to <a class="underline" href="/en/guides/ground-and-roof-tank-system-cleaning-order-pump-transfer-jeddah">cleaning ground and roof tanks in the right order</a>.

The technician is not expected to write technical essays. Plain wording and the right sequence are enough.

The record should name the product used for washing and disinfecting, or at least its category, and it should be suitable for tanks that hold household water. If lingering smell worries you, ask to see the product’s instruction sheet.

Contact time is how long the solution stays on the surfaces before rinsing. No single number suits every product; the manufacturer’s instructions are the reference, so ask which duration the crew followed rather than accepting a vague answer.

If a strong smell is present when the tank is refilled, do not drink the water and call the company straight away for another rinse. It usually means the final rinse was not thorough enough.

A cleaning visit is a rare chance to see the inside of the tank, so the technician should note the lid and how well it seals, the vents and their screens, the float valve, the valves and visible pipes, and any cracks, leaks, rust or flaking internal coating.

These notes turn the visit from a wash into an inspection. A broken lid on a roof tank, for example, lets in dust, birds and insects, and a worn float can mean overflow or a tank that stops filling.

If the record flags a fault, ask who will repair it, whether it falls within the service or needs a plumber or contractor, and when it can be done.

Photos are among the best evidence in a record, provided they are taken from the same angle. A before picture from the left corner and an after picture from the right corner prove nothing, whereas two shots of the same patch of floor show the difference clearly.

Watch the lighting. Tanks are dark, and weak photos can hide sediment or suggest a cleanliness that is not real. Ask for one shot of the floor, one of a wall, one of the lid from inside and one of the inlet.

If the crew took no photos, ask for a detailed written description instead. Missing pictures are not a defect in themselves when the description is precise and convincing.

A good record ends with practical advice: when the next visit should be, whether a repair is needed before then, and what you can check yourself, such as the lid once a month. The date depends on the tank type, its condition and how the water is used, not on a fixed number for everyone.

Keep the record and photos in one place. They help a new tenant, the owner or the building committee, and they make the next visit easier because the crew can see what was found last time.

Once you hold two records a known time apart you will understand how quickly sediment builds in your own tank, which is information nobody else has.