On the bill
Why did my water bill suddenly double?
A water bill that doubles in one billing period without any change in how the household uses water almost always means water started leaving the property continuously at some point during that period. The usual suspects, in order, are irrigation, a pool, a toilet and the buried service line.
What it usually is
A doubled bill is a step, not a spike
A water bill that doubles with no change in household use usually means a continuous loss started during that billing period.
Household water use moves in a curve here. It climbs through spring, peaks in the hottest months and falls back in autumn, because that curve is the irrigation and the pool answering the weather. A doubling that follows that curve is a season. A doubling that appears in a cool month is not.
A leak that starts mid-period produces a distinctive shape: a bill that is noticeably up, followed by a second bill that is up much further. The first one is only partly affected and the second one carries the loss from start to finish. If your second bill is worse than the first, the loss is still running.
Be honest about it
What it could be instead
Before treating a doubled bill as a leak, rule out the billing explanations:
- A different number of days in the period. Billing periods are not calendar months and rarely identical in length.
- An estimated read followed by an actual one. The correction lands in a single bill and looks like a spike.
- Something that happened once. Filling or topping a pool, a new landscape being established, house guests, or a long irrigation run after a planting.
- A change in the sewer portion, which in several Valley cities is calculated from winter water use rather than from this month's.
Your provider's own page explains which of those apply to you - see bills by water provider.
Narrowing it down
Where the water usually went
| What else is true | Most likely source | What to check first |
|---|---|---|
| The pool auto-fill runs often | The pool or its buried plumbing | Close the auto-fill and run the bucket test |
| A patch of the yard stays damp or green | Irrigation, or the buried service line | Turn the controller off for two days |
| You can hear water with everything off | A fixture passing water, or a slab leak | Dye-test the toilets, then read the meter |
Ten minutes, on your own
Ten minutes with the bill and the meter
Start with the usage history rather than the total. The total is the least useful part of the bill for this.
Find the usage history on the bill or in your online account
Most Valley providers show a bar per period going back a year or more. You are looking for a floor that has risen, not a tall bar.
Note which period the step starts in
That date is worth more than the amount, because it tells us when the loss began.
Turn everything off and read the meter twice, an hour apart
Movement on the low-flow indicator confirms a continuous loss on your side of the meter.
Dye-test the toilets and close the pool auto-fill
Two of the four usual suspects, eliminated in ten minutes with no tools.
How urgent is it
Every day it runs is another day of it
A high bill is not a physical emergency. Nothing is going to fail tonight because of it.
What makes it worth moving on is that in several Valley cities a leak running through the winter months also affects the sewer portion of the bill for the following year, because that charge is calculated from winter water use.
If you call us
How the search gets narrowed
Isolation, in the order that eliminates the most ground fastest: the irrigation is shut off at its valve and the meter re-read, which separates the yard from the house in one move. Then the pool, then the house supply.
Whichever side is still losing gets pressure tested, listened to and traced until the loss has a location. If nothing is losing, that is the finding and it goes in writing the same way. See high water bill investigation.
Straight answers
Bill questions
Can a leak really double a water bill?
Yes, and it does not take a dramatic one. A continuous loss runs every hour of the billing period while household use runs in short bursts.
Where do most Valley water leaks turn out to be?
Outdoors. Most of the water a Valley home uses goes outdoors according to City of Phoenix Water Services, and irrigation, pool plumbing and the buried service line between the meter and the house account for a large share of what we find.
My bill doubled but I cannot see anything wrong. Is that possible?
It is the normal case. A buried leak surfaces slowly or not at all in caliche and gravel, and a pool loss is hidden by the auto-fill.
Will my water provider adjust the bill after a leak is repaired?
That is entirely theirs to decide and we will never promise it. Providers differ, and several publish nothing about it at all. Ask your own provider what they do, and take your meter readings and the written findings with you.
Tell us what the water is doing
Which billing period the step starts in, and whether the meter moved with everything switched off.
Send a photo of the usage history
The bar chart on your bill or in your online account often shows when the loss started.
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What customers in the Phoenix valley have written. The words are theirs, on listings we cannot edit.
“Humberto has been amazing! Prompt, professional, and patient. He has gone above and beyond, taking the time to show me how to operate the water valves and educating me so I can continue to monitor for future leaks. He identified multiple leaks and made thoughtful recommendations.”
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