Underground tank leak detection for villas in Al Mrjan, Jeddah

Prepared by the technical team · editorial review · last updated 13 November 2026 · Sources

Why underground tank leak detection differs in Al Mrjan

The centre of Al Mrjan is at 21.6875, 39.1001, about 17.7 km from the centre of Jeddah, with an approximate radius of 3.1 km. The service-area circle on the map below is drawn from this point. Al Mrjan is about 0.7 km from the sea coast (OpenStreetMap).

The centre of Al Mrjan sits about 8 m above sea level (SRTM open elevation data). Main roads in or near Al Mrjan: Madinah Road, Prince Sultan Road, Al Takhayyul Street.

Underground tank leak checks for villas in Al Mrjan, Jeddah, start with the location itself. The centre of Al Mrjan sits at 21.6875, 39.1001, about 17.7 km from the centre of Jeddah, with an approximate radius of 3.1 km, so most villas here are set in a neighbourhood that is some distance from the main city core. The centre sits about 8 m above sea level, and the coast is only about 0.7 km away. Because the ground is low and close to the sea, we first look at how groundwater and salt air may affect buried steel and concrete tanks, and at whether any water table pressure could be pushing against the walls.

Other points are left to the site visit. The technician will need to see the tank itself, its access points, the pipework that runs to and from it, and the condition of the surrounding soil. Tank age, original construction, past repairs and any signs of seepage around the lid or fittings can only be judged on the ground. The inside surface matters too; internal coating for tanks is priced at SAR 25–65 per m², and the actual area and condition needed will depend on what the inspection finds. Nothing in this section should be read as a finished diagnosis, because the true state of a tank is only known once it has been opened up and examined.

To help the technician, it is useful to have ready the history of the villa's water system, including when the tank was last cleaned or serviced, any earlier leak repairs, and whether water bills or pump run times have changed recently. Note where you have noticed damp patches, unusual smells, or a drop in stored water. Make sure access to the tank cover and the plant area is clear before the visit, and say whether the tank is still in use. Clear information of this kind lets the visit focus on the key checks and makes the findings easier to understand afterwards.

Villas often have several lines and tanks; we test them one at a time so the cause is clear.

When do you need underground tank leak detection?

If you notice one of these signs in Al Mrjan, it is a good moment to talk to the team:

• Damp or salt marks on the tiles above the tank
• The tank needs refilling faster than usual
• The pump runs for longer periods

The most common causes

• Cracks in the concrete tank walls or floor — we check this before anything else.
• Construction joints and corners — we check this before anything else.
• A common cause: a float valve that does not close, so water is wasted.

How we choose the tool in Al Mrjan

From the first visit to the report

1. Safety first: Tank lids and confined spaces are handled with ventilation and a second person on site.
2. Documented level test: Filling and use are stopped and the level is recorded against time.
3. Isolating the tank from the network: This tells us whether the loss is from the tank body or from the supply line.
4. Checking the body and connections: Inlet, outlet and overflow connections are inspected.
5. Recommendation: You get the next step in writing: repair, waterproofing or a line test.

Facts and costs — Al Mrjan

Questions from Al Mrjan

Common mistakes we see

• Ignoring the float valve
• Waterproofing the tank before confirming the loss is from the tank and not the line

What you receive

The written output: the written level-test result and the recommended next step. The report is numbered and can be checked with its verification code.