Concrete underground storage tanks and rooftop tanks anchor water supply across Saudi villas and commercial buildings. A faulty float valve, unsealed manhole neck, leaking pump suction union, or structural shell crack can lose thousands of liters underground without wetting a single interior room. Manar Al Sharqiya provides safe, methodical tank leak diagnostics across the Eastern Province.
When an indoor bathroom or wall pipe fails, plaster blisters within days. An underground reinforced-concrete water tank beneath a villa courtyard behaves completely differently: surrounded by permeable sand backfill, a tank breach or overfilling neck joint can discharge massive volumes directly into sub-grade soil for months with zero indoor symptoms.
Equally important, losing water at a ground tank does not automatically mean the concrete tank structure has cracked and needs expensive full-scale re-lining. In many field inspections, the lower concrete basin is completely sound—while water is actually escaping through a worn mechanical float valve overtopping an unsealed masonry tank neck, a cracked post-meter inlet union, or reverse gravity backflow from the rooftop tank.
Manar Al Sharqiya treats water tank leak detection as an objective diagnostic step first: verifying valves, inlet/suction piping, neck joints, and static water-level stability so you know the exact cause before committing to any repair or waterproofing scope.
Significantly higher metered consumption and a spinning meter dial despite all indoor fixtures being shut.
Noticeable drop in stored water level within 24 hours even when household usage is minimal or the transfer pump is off.
Persistent moisture rings around the courtyard access cover or sunken tiles adjacent to the tank perimeter.
Household water turning noticeably brackish or cloudy when tank levels run low despite clean municipal supply.
Standing moisture around rooftop tank bases, bulkhead fittings, or transfer-pump unions.
Pitted brass float seats, waterlogged float balls, or stuck tether switches fail to shut off incoming municipal supply when the tank reaches capacity.
Physical Mechanism: Water rises silently into the unwaterproofed manhole neck overnight and drains straight into courtyard sand.
Access necks are commonly built from concrete block above the tank roof slab without continuous waterproofing.
Physical Mechanism: Any water rise above the roof soffit escapes laterally between block courses.
Cracked suction lines, leaking pump unions, or failed check valves on the riser feeding the rooftop tank.
Physical Mechanism: A failed check valve lets rooftop tank water drain backward into an already full ground tank, causing mysterious courtyard overflow; see Pipe Leak Detection.
Hydrostatic head inside 2–3 meter deep concrete tanks forces water through shrinkage cracks, tie-rod holes, or delaminated old render.
Physical Mechanism: Produces steady 24-hour water loss proportional to water depth.
Inspect float closure under live supply from the access opening and compare meter movement with the tank inlet open versus isolated.
Step Purpose: Separate inlet-pipe and float-overrun losses from structural tank leakage immediately.
Examine manhole neck masonry, pipe sleeves, and upper render condition from above using high-output inspection lighting.
Step Purpose: Identify high-level overflow pathways and groundwater salt staining.
Isolate the transfer pump riser and check valve to ensure overhead storage is not siphoning backward into the ground tank.
Step Purpose: Rule out cross-tank hydraulic backflow.
With inlet and suction valves closed, establish a precise reference measurement from the top opening and verify level stability over a controlled interval.
Step Purpose: Confirm objectively whether the concrete shell itself is losing water and at what elevation.
In low-lying coastal zones and sabkha soils of the Eastern Province, shallow saline groundwater can sit higher than the floor of an underground concrete tank. Depending on internal water height, hydraulic pressure acts in both directions: a full tank pushes treated water outward into soil, while a partially drawn-down tank experiences negative-side external pressure that forces salty groundwater inward through unsealed construction joints.
This Phase 03 service covers technical leak investigation and root-cause verification. When testing proves the fault is a float valve, check valve, suction union, or upper neck joint, targeted plumbing correction resolves it cleanly. Only when static testing or infiltration evidence confirms concrete shell permeability is full tank dewatering, crack injection, and potable-grade water tank waterproofing recommended as a separate scope (see our tank epoxy vs. cementitious comparison).
On rooftops, UV-aged bulkhead fittings and overflow pipes on polyethylene or fiberglass tanks often drip continuously onto roof tiles, saturating screed beds and mimicking rain leaks.
We check float valves, backflow check valves, and inlet lines first so you never pay for unnecessary tank relining.
Zero unsafe confined-space entry and strict electrical isolation around wet pump zones.
We account for both outward water loss and coastal brackish groundwater ingress.
Call or WhatsApp Manar Al Sharqiya at 0590941982 to schedule a ground or overhead tank inspection in your area.
That classic symptom is usually reverse backflow from the rooftop tank. When the check valve on the transfer pump line fails, water stored on the roof drains backward by gravity down into an already full ground tank, forcing water out the manhole cover.
During a static drop test, a neck joint leak drops rapidly from maximum fill level and then stops completely once the water surface falls below the neck-to-roof joint, whereas a floor or lower-wall crack continues dropping steadily.
No—having water inside the tank is actually helpful for testing float valve shutoff and conducting a real-world static water-level drop measurement.
Yes. Constant dripping from a rooftop tank outlet union, float overflow, or booster pump connection saturates the roof screed day after day and eventually finds weak joints in aging roof waterproofing.
If incoming municipal supply is fresh at the meter check point while water drawn from the ground tank tastes brackish, shallow coastal groundwater is likely seeping inward through a construction joint or crack when tank levels drop.
Yes. We inspect underground concrete storage tanks, rooftop polyethylene/fiberglass tanks, float controls, interconnection manifolds, and pump suction/delivery unions.
Have another specific question about your property? Reach us directly by phone or WhatsApp.
Contact Manar Al Sharqiya by phone or WhatsApp at 0590941982 for an objective ground and rooftop water tank leak inspection.