Leak Detection
Locate hidden water loss behind walls, under floors or along the buried pipe, then decide how small an opening can be.
Plumbing guide
Why Is My Water Bill So High in Mesa, AZ?
A bill that doubles with no change at home usually has a cause you can find in an afternoon. Begin at the meter, then check the common culprits in turn.
By the Mesa Plumbing 24/7 team ·
Compare this bill to the last twelve
One high month is a clue. A slow climb across many months is a different clue. Ask the City of Mesa for your usage history, or look at past bills, and note when the change started.
Seasons matter here. Summer watering, a pool and evaporative cooling can raise a bill without any leak at all.
Run the meter test
Close every tap, stop the dishwasher and washing machine, turn off the ice maker and shut off the irrigation controller. Then open the meter box and look at the leak indicator, a small triangle or dial.
If it spins with everything off, water is leaving the pipes somewhere. Record the number, leave the water alone for two hours, then read it once more.
Inside the house
Toilets are the top culprit. A flapper that fails to seal can quietly lose a great deal of water over a month. Look under sinks, behind the washer and around the heater for damp spots.
A leak in a wall or under the slab may show only on the meter. If the indicator moves and you cannot find a wet spot, a leak detection visit is the next step.
Common causes of a jump in the bill
Start with the cheapest checks and work toward the hidden ones.
| Cause | Clue | First check |
|---|---|---|
| Toilet leak | Tank refills without a flush | Dye test in the tank |
| Irrigation leak or bad timer | Wet spots or sprinklers on at odd hours | Run each zone and watch |
| Pool refill or auto-fill fault | Pool level stays high after summer loss | Check the fill valve |
| Underground line leak | Meter moves with everything off | Meter test, then a leak search |
Outside the house
Sprinkler valves stuck open, a cracked head or a drip line with a blowout waste water quietly. Walk the yard after the system runs and look for pooling or soggy spots.
Pools lose water to evaporation, but an autofill valve can hide a leak by topping the pool off. A bucket test separates the two.
Evaporative coolers and other seasonal users
Many Mesa homes use an evaporative cooler in dry months. A float valve that sticks open can run for days. Check the cooler pan and the supply line.
Add up other seasonal users too: filling a spa, washing vehicles, or guests staying for the winter.
What to do about the bill
If you find and fix a leak, keep the repair receipt and ask the City of Mesa whether any adjustment applies. Policies change, so ask directly.
If you cannot find the cause, call. A contractor can pressure test the lines, check the service pipe and tell you where the water goes.
Read the bill before you hunt
Start with the usage line, not the total. Compare this period with the same months last year, since summer use rises with irrigation and pools. A jump that matches a heat wave is different from one that appeared in a mild month.
Check the billing dates too. A longer period than usual, or an estimated read, can inflate one bill and shrink the next. If the meter reading on the bill does not match the number on your meter, contact the utility before you assume a leak.
Irrigation and pool causes
Sprinkler timers fail quietly. A zone that runs at the wrong hour, a stuck valve or a broken head can send hundreds of gallons into the ground every day. Walk the yard while each zone runs and look for geysers, pooling and dry patches.
Pools add their own tricks. An auto-fill valve that sticks open replaces water as fast as it leaks, so the level never drops and nobody notices. The pool leak page explains how the loss is traced when the level looks fine.
Hidden leaks and when to call
If the meter moves with every fixture off, the water is leaving somewhere. Closing the house valve and watching the meter tells you whether the loss is inside the home or on the line from the meter.
A leak under the slab or in a buried line will not show on the surface at first. Professional detection uses acoustic gear and thermal tools to find the spot without tearing up the floor. See leak detection and water line repair for how that work goes.
Steps to take this week
Read the meter, run the toilet dye test, walk the irrigation zones and check the pool fill. Write down what you find. These steps cost nothing and often solve the mystery.
If the meter still moves, call for leak detection and share your notes. Ask the utility about its adjustment policies, since some utilities review bills after a verified leak.
Why prompt action pays
A leak that runs for a month costs more than one found in a week. Early checks keep the cost of water and damage low. Write down your findings so you can show them to the plumber and the utility.
Most causes turn out to be modest. A flapper, a timer or a loose fitting explains many surprises. Hidden leaks are less common but worth ruling out when the meter does not stop.
Seasonal patterns to expect
Bills rise in hot months when yards and pools need more water. Compare to the same months last year before drawing conclusions.
If this year is much higher than last for the same weather, look for a leak or a changed habit. The EPA's WaterSense program estimates that the average household's leaks waste more than 10,000 gallons a year, so a quiet leak is a realistic explanation.
A simple monthly habit
Read the meter on the same day each month and write the number down. A jump with no change in household habits is the earliest warning you will get.
Take a photo of the meter face when you record it. A dated picture settles any later question about when the usage changed, and it helps if you ever need to discuss a bill with the utility.
If the habit shows a rise, run the dial test with every tap off. A moving dial points to a leak. A still dial suggests the cause is usage, such as irrigation timers set too long during hot months.
Common questions
Water bill questions
Yes. A silent leak can waste hundreds of gallons a month. Use food coloring to test the tank.
Run the meter test first. If the dial moves with the house shut off, call a plumber. The city can answer questions about usage history.
A leak or a stuck autofill can. Run a bucket test.
Rarely for the water itself. Ask your insurer about the damage and the repair.
Related services
Slab Leak Detection & Repair
Pinpoint a failing line under the concrete floor of a Mesa home and compare spot repair, reroute and repipe.
Pool Leak Detection & Repair
Separate real pool water loss from summer evaporation, then locate the failing line, fitting or valve.
Bill still high after checking?
Call and describe what you found. The dispatcher will set up a visit.