The bill arrives with a number you did not expect, and the same sequence of questions starts: is there a leak? Is the meter wrong? Or has consumption genuinely gone up? The difference between those three can be settled in half an hour, without paying a riyal.
Test one: the meter reading
This test answers only one question, but it is the most important one: is there a leak on the network or not?
- Close every tap in the house, and make sure the washing machine, dishwasher and any water-fed equipment are fully off.
- Go to the water meter and write down the full reading including the small digits, or photograph it.
- Use no water for 30 to 60 minutes. Tell the rest of the household so nobody opens a tap.
- Go back and take the reading again.
If the reading has moved, there is a leak somewhere between the meter and the furthest point in the house. If it has not moved at all, the network is sound and the rise is down to consumption or something on the billing side. Many modern meters have a small leak indicator shaped like a triangle or star that spins on any flow however slow — if you see it turning with all taps closed, you have your answer immediately.
Test two: the cistern dye test
If the meter test proves a leak, start with the most common source before anything else: the toilet cistern. A cistern leak is completely silent, leaves no mark on the floor, cannot be heard, and can waste thousands of litres a month.
- Lift the cistern lid.
- Add a few drops of food colouring or a spoon of coloured powder to the cistern, and do not flush.
- Wait twenty minutes without using that bathroom.
- Look into the toilet bowl. If the colour has appeared there, the flush seal inside the cistern is leaking and needs replacing.
This is one of the cheapest plumbing repairs and one of the most effective on a bill, and many homes have more than one bathroom with the same fault.
Where leaks usually come from
Leak sources in Riyadh call-outs
Notice that the two largest owner-checkable items — the cistern and the irrigation line — need no technician at all. Pipework under the floor is what needs instruments, and it is also the most damaging, because it works silently and weakens the structure over time.
Table: the sign and the likely source
| What you notice | Likely source | Who fixes it |
|---|---|---|
| High bill with no visible water | Cistern or buried supply pipe | Technician after a meter test |
| A damp patch slowly growing on a wall | Supply pipe inside the wall | Leak detection technician |
| Damp only when the bathroom is used | Drainage, not supply | Plumber |
| Damp on a wall shared with a neighbour | Neighbour's line or a shared pipe | Needs a written report |
| Low water pressure with a high bill | Large leak before the distribution point | Urgent inspection |
| Damp under an indoor AC unit | AC condensate, not a water leak | AC technician |
When you need instrument detection
When the meter test confirms a leak but the cisterns are sound and there is no visible patch, the source is buried. That is where instruments start to matter: an electronic listening device that picks up flow noise inside the pipe, a thermal camera that reads temperature differences behind tile or plaster, and a pressure test that isolates the damaged line from the rest of the network.
The purpose of these tools is not simply to find water — it is to fix the point precisely enough to open 30 to 40 cm instead of demolishing a whole room. Always ask for the location to be identified and marked on the floor before any hammer starts.
The technical report and disputing the bill
If the rise was caused by a proven leak, the written technical report — showing the leak location, the date it was found and photographs of the repair — is the document you need to lodge a billing dispute with the utility. Ask the technician for it before they leave, not a week later.
Frequently asked questions
How much water can a small leak waste?
A slowly dripping tap can waste tens of litres a day, and a continuously leaking toilet cistern can waste many times that because the flow never stops. The effect shows clearly within a single billing cycle.
Could the meter itself be wrong?
Possible, but not the first thing to suspect. The correct order is to run the meter test first: if the reading does not move with everything closed, the meter is behaving sensibly; if it moves, there is real flow. Requesting a meter check comes after ruling out a leak, not before.
Does instrument detection mean breaking the floor?
No. The whole point of the instruments is to avoid random breaking. The location is identified first, then a small area is opened at that exact point. Any company that starts breaking before locating is not doing real detection.
Need help with this?
Our team provides Plumbing & leak detection across every Riyadh district.
View service