Why did my water bill suddenly go up?
A bill well above the seasonal norm with no change in usage, sometimes with a warm floor spot, a damp yard, or the sound of running water.
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Key takeaways
- This is usually not an emergency, but it does not fix itself and it gets worse if you leave it.
- Most likely cause: Running toilet.
- Do this first: Shut off all water and watch the meter for fifteen minutes.
- Call right away if water is surfacing in the yard or pooling near the foundation.
- The repair starts with: Isolate the house from the service line and irrigation.
What it is
Sudden spike in water bill A sudden spike in the water bill with no change in usage means water is escaping somewhere in the system without being noticed, most often through a running toilet, an irrigation leak, or a hidden slab or underground leak.
It is not an emergency, but an unexplained spike should be investigated quickly since a hidden leak keeps wasting water and can cause damage the longer it runs.
The short answer
A water bill that jumps without a change in habits almost always means a leak that runs continuously. Run the meter test first. Shut off every fixture, then watch the meter for fifteen minutes. Any movement means water is escaping somewhere on your side of the meter. The most common culprits are a running toilet, an irrigation leak, and a leaking underground service line. A slab leak is less common but far more expensive to ignore.
What it usually means
These are the causes we find most often, ranked from most likely to least.
- 1
Running toilet
Most likely
A single failed flapper can waste thousands of gallons in a billing period.
- 2
Irrigation system leak or stuck valve
Common
Seasonal spikes usually trace to the sprinkler zone rather than the house.
- 3
Leaking water service line
Common
Buried leaks show no interior sign until the yard stays wet or pressure drops.
- 4
Slab leak under the foundation
Less common
A warm spot on the floor or the sound of running water with everything off.
- 5
Dripping fixtures and failing supply connectors
Occasional
Small drips add up across a full house over a quarter.
What to do right now
- 1Shut off all water and watch the meter for fifteen minutes.
- 2Dye test every toilet with food coloring in the tank.
- 3Shut off the irrigation system and repeat the meter test.
- 4Walk the yard for soft, green, or sunken ground over the service line.
When it is an emergency
- Water is surfacing in the yard or pooling near the foundation.
- You hear running water inside a wall or under the floor with everything off.
What the fix involves
The work starts with locating the leak, not guessing at it. Electronic leak detection narrows the source so the repair is targeted, which matters most for slab and buried service line leaks where blind excavation is the expensive path.
- 1Isolate the house from the service line and irrigation.
- 2Run electronic and acoustic leak detection.
- 3Repair the fixture, irrigation, service line, or slab leak found.
- 4Retest the meter to confirm the loss has stopped.
What drives the cost
Every job is quoted before work begins. These are the factors that move the number on this kind of repair.
- Fixture repair versus service line or slab work
- Depth and length of a buried repair
- Whether concrete or landscaping must be opened and restored
- Leak detection time on hard to find leaks
Related problems homeowners ask about
Why does my toilet keep running?
The tank refills on its own every few minutes, or you hear a constant trickle into the bowl between uses.
Read this nextHow do I know if I have a slab leak?
A warm or damp patch on the floor, running water you can hear but not see, a musty smell, or cracking in flooring above the leak.
Read this nextWhy is water pressure low in my whole house?
Weak flow at every tap, showers that lose force when another fixture runs, and appliances that take much longer to fill.
Read this next
Read more on this
This page is for triage and dispatch. These guides go deeper on how the work is done and what shapes the price.
Licenses, credentials, and company proof
- Colorado Master PlumberLicense MP-18927
- Colorado State Plumbing ContractorLicense 2110
- Family Owned & OperatedServing Denver since 2006, 20 years
- Better Business BureauAccredited Business, A+ rating
- Angie's List Super Service Award2012 through 2017
- Serving Denver since 2006Residential and commercial properties across the metro
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Before you book: pricing, timing, and guarantees
Straight answers on what water bill suddenly high work costs, how fast we can get out, and what stands behind the repair.
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