Your DEWA Bill Just Spiked. Here's Exactly What to Check (And What It's Costing You)

You open your DEWA app, see the bill, and do a double-take. It's 40% higher than last month. Nothing obvious has changed — same number of people in the house, same routines, same appliances. So what's going on?

A sudden spike in your DEWA water bill is one of the most common and most frustrating home maintenance problems in Dubai. The good news is that in the vast majority of cases, the cause is identifiable and fixable. The bad news is that if you ignore it, you'll pay for it every single month until you do something about it.

Here is a systematic guide to finding the cause — in order of likelihood — with real numbers so you understand what each problem is actually costing you.

Step 1: Rule Out a DEWA Reading Error

Before you do anything else, check your meter reading yourself. Go to your water meter (usually in a box near the entrance of your villa or in the utility area of your apartment building) and compare the reading with what appears on your bill.

Meter reading errors are rare with DEWA's smart meters but they do happen, particularly if your meter has recently been replaced or if there was a system update. If the readings don't match, contact DEWA directly on 04 601 9999 — they will investigate and adjust if there's been an error.

If the readings match, the water was used. Now you need to find out where.

Step 2: Check for a Silent Toilet Leak (Most Likely Cause)

This is the single most common cause of unexplained water bill spikes in Dubai, and it's the one that catches most homeowners completely off guard. A toilet with a faulty flapper valve or fill valve can leak silently into the bowl — no puddles, no obvious dripping, no sound. Just water running continuously from the cistern into the toilet and straight down the drain.

The numbers are alarming. A slow toilet leak wastes around 200-400 litres per day. A significant leak can waste 1,000 litres or more. In Dubai, where water is priced in tiers, a leak of this size can add AED 300-800 to your monthly bill depending on your baseline usage and which pricing tier you're in.

How to check: Put a few drops of food colouring into your toilet cistern (the tank at the back). Don't flush. Wait 15 minutes. If colour appears in the bowl without flushing, you have a leak. Check every toilet in the property.

Fix: A plumber can replace a faulty flapper valve for AED 150-300 including parts. It takes 30 minutes. One of the best value repairs you'll ever make.

Step 3: Check All Taps and Showerheads for Drips

A dripping tap seems trivial. It isn't. A tap dripping once per second wastes approximately 12,000 litres per year. In Dubai's tiered pricing structure, that's real money — and if you have multiple dripping taps across bathrooms, kitchens, and utility areas, the cumulative effect is significant.

Walk every tap in the property and check for drips when fully closed. Pay particular attention to outdoor taps connected to garden irrigation — these are frequently left slightly open and can waste enormous amounts of water unnoticed.

Fix: Replacing a washer or cartridge in a dripping tap typically costs AED 100-200 including a plumber call-out. Showerhead drips are often caused by a worn seal and are equally straightforward to fix.

Step 4: Inspect Your Water Tank and Pump

Most Dubai villas and older apartment buildings use a rooftop or basement water storage tank with a pump to maintain pressure. These systems can develop leaks that are completely invisible from inside the property — water leaks from a cracked tank or a faulty float valve simply overflow and drain away without ever appearing indoors.

A malfunctioning float valve in a water tank — the device that should stop water flowing in once the tank is full — can cause the tank to continuously overflow. Depending on the tank size and the severity of the fault, this can waste thousands of litres per day.

How to check: Turn off all taps and appliances in the property. Watch your DEWA water meter for 15-20 minutes. If the meter continues to move when nothing is being used, water is going somewhere it shouldn't. A continuously running pump is also a strong indicator of a tank or pipe issue.

Fix: A plumber will inspect the tank, float valve, and pump. Replacing a faulty float valve costs AED 200-500. A cracked tank may need replacement — costs vary significantly based on tank size.

Step 5: Look for Underground or In-Wall Pipe Leaks

This is the most serious and most expensive scenario — a leak in the water supply pipes running under your floor or through your walls. In Dubai's older villas, copper and galvanised steel pipes degrade over time, particularly given the combination of high water pressure, hard water mineral buildup, and temperature cycling from summer heat.

Signs of a pipe leak include: unexplained damp patches on walls or floors, tiles that have lifted or sound hollow, a persistent musty smell in specific areas, or reduced water pressure at taps despite no other obvious cause.

The meter test described above (step 4) will confirm whether water is being lost somewhere in the system. A plumber can use pressure testing to identify the location of the leak without tearing up your floor unnecessarily.

Fix: Costs vary enormously depending on location and severity. A simple accessible pipe repair might cost AED 500-1,500. A leak under a tiled floor requiring excavation can cost AED 3,000-10,000+. This is why catching it early matters — a small leak becomes a major leak over time.

Step 6: Consider Seasonal and Behavioural Changes

Not every spike is a leak. Before calling a plumber, think honestly about whether anything has changed in your household.

In Dubai's summer months, water usage typically increases significantly: more showers (and longer ones), more laundry, garden irrigation running more frequently, swimming pools being topped up more often, and cooling tower usage in buildings. If your spike coincides with the start of summer, this may be the primary explanation.

Other behavioural factors to consider: guests staying, a new appliance (washing machine, dishwasher, water purifier with a drain line), changes to garden watering schedules, or a domestic worker who has changed their routines.

Step 7: Check Your Irrigation System

If you have a garden irrigation system, check it thoroughly. Irrigation controllers can malfunction and run cycles at incorrect times or frequencies. A broken irrigation head can spray water continuously rather than in timed bursts. A leaking irrigation pipe underground will show no surface signs but will waste significant amounts of water.

The easiest check: turn off your irrigation system completely at the controller for a week and compare your water usage. If the bill normalises, you've found your culprit.

What to Do If You Can't Find the Cause

If you've worked through the checks above and still can't identify the source, the next step is a professional leak detection survey. Specialist companies use acoustic detection equipment and thermal imaging to locate leaks without destructive investigation. In Dubai, expect to pay AED 500-1,500 for a professional leak detection survey — a worthwhile investment before any significant repair work.

You can also contact DEWA to request a technical inspection if you suspect a meter fault or a leak in the supply line between the main and your property boundary — this section is DEWA's responsibility to repair.

Can You Get a Bill Reduction for a Leak?

DEWA does not automatically reduce bills for internal leaks — the position is that the water was registered passing through your meter and is therefore your consumption. However, if you can demonstrate that a significant leak occurred, was repaired promptly, and that your subsequent usage has returned to normal, it is worth contacting DEWA to discuss. Some customers have had goodwill adjustments made, particularly for first-time incidents of significant magnitude.

Keep receipts from your plumber and document everything — dates, the nature of the leak, and the repair carried out.

Finding the Right Help

Most of the issues described above require a licensed plumber. In Dubai, plumbing work should be carried out by a contractor holding a valid Dubai Municipality trade licence. Using an unlicensed handyman for plumbing work can void your building insurance and create liability issues if the work causes further damage.

BidMyJob.ae connects Dubai homeowners with vetted, licensed plumbers across the UAE. Post your job free — describe what you're seeing, whether it's a suspected leak, a dripping tap, or an unexplained bill spike — and receive competitive quotes from verified professionals. No call centres, no middlemen.