Underground tank leak detection for villas in Al Nzha, Jeddah

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

Why underground tank leak detection differs in Al Nzha

The centre of Al Nzha is at 21.6247, 39.1662, about 9.1 km from the centre of Jeddah, with an approximate radius of 2.5 km. The approximate area shown on the map is centred here. Main roads in or near Al Nzha: Prince Ahmed bin Abdulaziz Road, Madinah Road, Prince Majed Road.

The centre of Al Nzha sits about 17 m above sea level (SRTM open elevation data). Al Nzha is about 6.2 km from the sea coast (OpenStreetMap).

Underground tank leak detection for villas in Al Nzha, Jeddah starts with the location itself. The centre of Al Nzha sits at 21.6247, 39.1662, about 9.1 km from the centre of Jeddah, with an approximate radius of 2.5 km, so most villa plots here are reached by a short drive from the city core rather than a long haul. The area also lies roughly 17 m above sea level and about 6.2 km from the sea coast. Because the ground is not at sea level and the coast is a few kilometres away, the first checks focus on the tank's position and the surrounding soil, rather than assuming the tank sits in a low-lying, waterlogged pit. Technicians look at how the tank was installed, how the fill and vent pipes connect, and whether any surface staining or damp patches suggest that fluid has been escaping.

Much of the work is left to the site visit, because a desk review cannot show what is happening underground. The technician will confirm the tank's material and age, walk the access points, and decide which detection method suits the tank and the pipework. Where a coating has been damaged, the cost of restoring it is usually quoted per square metre of internal surface, in the range of SAR 25–65 per m², so the size of the tank will shape the estimate. The final choice of test, and whether any repair is needed, depends on what the technician finds on the day, and it is best confirmed in person rather than promised in advance.

To help the technician, it is useful to have the following ready before the visit. Note the villa's exact plot location and any landmarks, since the area is spread across a wide zone of about 2.5 km around the centre. Record when the tank was installed and whether it has been repaired before, and gather any earlier inspection notes or invoices. Mention any recent changes in fuel use, unexplained drops in stock, or smells near the ground. Clear a route to the tank's access covers and make sure the pumps and valves can be reached. With this information in hand, the visit can move straight to testing and the team can explain the results clearly to the homeowner.

In a villa, tanks, the roof and the yard lines are usually yours to look after, so it helps to know where the main valve and tank hatches are.

Signs that call for underground tank leak detection

The following signs are worth checking before they grow:

• A noticeable drop in the water level overnight
• The pump runs for longer periods
• The tank needs refilling faster than usual

The most common causes

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

Tools and methods, and when we use them

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 Nzha

Common questions about underground tank leak detection in Al Nzha

Mistakes that cost more

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

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.