Water tank leak detection — service guide
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The underground tank is buried and unseen; the roof tank sits above and you do not climb to it daily. So water loss in either can continue for months before it is noticed. The direction can even be reversed: water entering the underground tank from the soil or a nearby drain, which is more serious because it touches drinking-water quality.
This service answers two questions by measurement: is the tank losing (or receiving) water? and where?
What we inspect in a tank
- Body: walls, floor, corners and construction joints in a concrete tank; cracks and seams in fibreglass and polyethylene tanks.
- Openings: fill inlet, pump outlet, overflow, drain, and the inspection hatch and its seal.
- Float valve: a float that does not close means continuous filling and silent overflow or waste.
- Pump line and the network after the tank: much of what is called a “tank leak” is a leak in the line leaving it.
- Surroundings: soil and wall moisture around an underground tank, salt deposits or sunken tiles above it.
When do you need the inspection?
- The pump runs often, or runs at night while the house is asleep.
- The tank level drops during hours with no consumption.
- A higher bill with a meter that turns while valves are closed.
- A change in the water’s taste, colour or smell, or mud in the underground tank after rain.
- Damp, salt deposits or cracks in the ground around the tank.
Start with the self level test if you can; its result helps us focus the inspection.
How we inspect
- Safety first: nobody enters a closed tank without ventilation and a person outside, and we cut power to the pump before working on it.
- Documented level test: we close filling and consumption, mark the level and measure after a set period; the drop is recorded with numbers and time.
- Isolating the tank from the network: we close the pump outlet and measure again to learn whether the loss is from the tank itself or the line after it.
- Body and connection check: visual survey with lighting, moisture reading on accessible outer walls, and acoustic listening on the pump and feed lines.
- Pressure test on the pump line when suspected.
- Documentation: photos of readings and positions and the recommendation (local repair, internal lining, float replacement or line repair).
After the inspection
If the fault is in the body or internal lining we propose tank waterproofing with drinking-water-suitable materials plus cleaning and disinfection. If it is in the line we propose the repair. The offer is written and separate, starts with your approval, and the lining work is documented in the insulation quality record when enabled.
How the service runs, step by step
- Booking
Choose the tank type (underground/roof), material, approximate capacity and the signs in the order form.
- What we need from you
Access to the tank hatch, the fill valve and the pump breaker, and no consumption during the level test.
- Inspection
Usually one to two hours; the level test may need a longer wait that we agree with you.
- Report
A numbered report with readings, photos, the probable cause and the recommendation.
- Repair or lining
A written quote, then a warranty certificate for the executed work.
What you receive
- A numbered inspection report with verify code: level readings, result of isolating the tank from the network, condition of connections and float, probable cause.
- A clear recommendation: local repair, internal lining, part replacement or network inspection.
- A written quote for any follow-up work.
- A verifiable warranty certificate for executed work.
How pricing works
Published inspection fee: 150.00 SAR (VAT included). Any further work is quoted after the on-site assessment, in writing, before it starts.
The price depends on tank type and capacity, ease of access and whether a pressure test on the pump line is needed. Cleaning, disinfection and lining are separate items priced in their own quote.
Verifying the report and warranty
Every inspection report and warranty certificate we issue carries a serial number, a verification code and a QR code. Enter the code on the verification page to confirm the document really came from us, that it has not been altered or revoked, and the warranty expiry date where one applies. A buyer, landlord or insurer can verify it the same way without contacting us.
Frequently asked questions
Do you separate a tank leak from a network leak?
Yes, that is the heart of the inspection: we measure the level once with the tank connected to the network and once isolated from it. The difference identifies the source.
Must the tank be emptied?
Not for the inspection; the level test needs water in the tank. Emptying is needed only for repair or internal lining.
How do I know water is entering from outside?
The level rises without filling, the water turns cloudy after rain, or salinity rises. We confirm by measurement and inspect the surroundings.
Does the roof tank need the same inspection?
Yes, with focus on the float, overflow and connections, because a roof-tank leak usually shows on the ceiling or walls below it.
How often should a tank be checked preventively?
A simple level test you do yourself every few months is enough for early detection. Instrument inspection when a sign appears or before summer when consumption rises.
Do you clean the tank in the same visit?
Cleaning and disinfection is a separate service that can be scheduled with or after lining; we mention it in the quote if you wish.
On-site service is available in Saudi Arabia; the guides and tools can be read anywhere.
This page is informational and educational. Confirming a leak, an insulation condition or a pest infestation always requires an on-site assessment, and structural questions are for a licensed engineer. We do not publish promises we cannot prove.