Why is my water bill suddenly high in Tempe?

First, confirm it is actually a leak

Before hunting for a leak, prove there is one. Turn off every water-using fixture and appliance in the house, then find your water meter, usually near the front of the property, and watch the low-flow indicator, the small dial or triangle that spins on even a trickle. If it keeps turning with everything off, water is leaving the system somewhere it should not. If it is still, the high bill may be a genuine usage change, a rate increase, or a billing issue worth a call to the City of Tempe.

This five-minute test is the single most useful thing you can do, because it separates a plumbing leak from a paperwork problem before anyone starts opening walls or digging.

The quiet toilet that runs up the bill

The most common hidden water waster in a Tempe home is a running toilet, and it is often silent. Very hard water scales the flapper and fill valve so the flapper stops sealing, the tank leaks down, and it refills, over and over, day and night. A toilet doing this can waste a startling amount of metered water while making almost no noise. To check, put a few drops of food colouring in the tank and wait without flushing; if colour appears in the bowl, the flapper is leaking.

The fix is cheap, a rebuilt or replaced flapper and fill valve, and it is usually the first thing to rule out because it is so common and so easy. Our toilet repair work is often exactly this: a scaled flapper quietly inflating a bill for months.

It helps to understand why the meter test is so reliable on a Tempe property specifically. Because homes here are slab-on-grade with the supply line running through and under the concrete, there is no basement or crawl space where a leak would announce itself with a visible puddle. Water from a slab leak goes down into the caliche, not up into a room you walk through, so for a long time the only symptom is the meter and the bill. That is why the low-flow indicator on the meter, rather than your eyes, is the honest first witness to a hidden leak here.

Irrigation, pools and the outdoor lines

Outdoor water is the next place to look, especially in a Valley home with irrigation or a pool. A cracked irrigation line, a stuck valve or a leaking drip system can run underground where you never see it, and a pool with an equipment or plumbing leak quietly drops and refills through its auto-fill. Because so much Tempe water use is outdoors, a summer bill spike often traces to the yard rather than the house.

Check the irrigation by running each zone and looking for wet spots, pooling or unusually green patches, and watch whether the pool's auto-fill runs more than it should. If the meter test showed a leak but the indoor fixtures are all fine, the outdoor system is the prime suspect.

If the meter test is ambiguous, there is a refinement that narrows it further. Note the meter reading last thing at night, use no water overnight, and read it again in the morning. Any movement over those still hours is almost certainly a leak rather than normal use, and the size of the change hints at the severity. It is a slower version of the same test, but on an intermittent leak, a running toilet that only sometimes cycles, for example, the overnight version catches what a quick daytime check can miss.

When the answer is under the slab

If the meter confirms a leak, the toilets are fine, and the irrigation checks out, the concern moves under the concrete. A slab leak, a pinhole in the copper supply cast into the foundation, wastes metered water continuously and often shows up first as an unexplained bill, sometimes before any warm spot or damp floor appears. On a hot-water line you are also paying to heat water that runs straight into the caliche below the slab, which is why these bills climb fast.

This is where electronic leak detection earns its keep. Acoustic and thermal equipment locates the leak to a small area without tearing up the floor, and from there it becomes a targeted slab leak repair rather than exploratory demolition. The longer a slab leak runs, the more you pay twice, in wasted water and in damage, so an unexplained bill is worth chasing down promptly.