Why Is My Water Bill So High? 7 Causes in North Texas Homes
The bill arrives and the number is wrong — sometimes a little wrong, sometimes double. North Texas bills climb for mundane reasons and for one serious one. This guide walks the seven usual causes in the order to check them, and how to tell the slab leak’s signature from all the others.
1–2: Irrigation and the silent toilet
Summer irrigation is the bill’s biggest honest mover in DFW: a sprinkler system running extra zones, a broken head geysering at 4 a.m., a controller reset by a power blink to factory watering. Check usage against the season before suspecting disaster — municipal bills often show the comparison.
The running toilet is the champion silent cause: a failed flapper or fill valve can pass hundreds of gallons a day without a sound a homeowner notices. Dye in the tank, check the bowl in twenty minutes — the two-dollar test that clears the most common suspect.
3–4: Water heaters, softeners and outdoor lines
A water heater’s pressure relief valve that weeps continuously, a softener stuck regenerating, a hose bib dripping behind shrubs, a pool auto-fill quietly topping off — each is a real cause with a real fix, and each hides in plain sight because nobody watches utility equipment.
Walk the equipment once a season. Heaters and softeners announce most failures as small, constant water movement you can see or hear if you look.
5–6: Guests, usage shifts — and the meter’s story
Sometimes the bill is honest: guests, a filled pool, a new garden, a teenager’s discovered love of long showers. Municipal reads can also slip a month, bunching two reads into one bill. Check the read dates before the conspiracy theories.
Then read the meter itself. With everything off — including irrigation and ice makers — a moving dial or a spinning leak indicator is the system confessing. The meter cannot tell you where; it can absolutely tell you whether.
7: The slab leak’s signature
A slab leak’s bill has a shape: a sudden step up that does not step back down, in any season, unexplained by anything above ground. Usage runs day and night because the pressurized line never closes. Left alone, the step grows as erosion enlarges the failure.
Its companions, when they arrive, are the floor and sound signs: warm spots, damp flooring, a murmur in quiet rooms. Bill plus any one of those is the pattern this site’s other guides are written for — and it stops being a billing question and becomes a repair one.
What to do with the evidence
Document the pattern: keep a year of bills (your utility’s portal has them), note meter readings weekly while you investigate, and photograph the dial. If underground leak is suspected, many Texas utilities offer a partial adjustment once a leak is repaired and documented — the paperwork starts here.
And if the meter moves with the house silent and every above-ground cause is cleared, stop investigating and start pinpointing. The remaining explanation lives under the slab, and it runs while you read.
There is no magic percentage — a sudden unexplained jump of a quarter or more, persisting into a second cycle, earns the meter test. Small leaks start as small steps.
Utilities confirm meter-side usage and sometimes flag continuous flow, but locating a leak inside your system is a plumbing assessment, not a municipal service.
Many North Texas utilities offer a one-time leak adjustment with proof of repair. Rules and caps vary by city — ask yours, and bring the repair documentation.
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