Why is my water bill suddenly so high? A 5-step checklist, in order.
A bill that doubled with no new habits is almost always water going somewhere it shouldn't. Work this checklist top to bottom — cheapest, most common causes first — and you'll either find it yourself or know exactly when to call us.
What you'll need
All cheap or free:
- Food coloring or dye tabs — for the toilet test
- A flashlight — for the meter box and dark corners
- Your last couple of bills — to see when it jumped
- Your phone — photograph the meter so you can compare
The 5 steps, in order.
Cheapest and most common first. Stop as soon as you find the culprit.
The running toilet — food coloring test
Toilets are the #1 cause of surprise water bills, and the leak is silent. Drop a few drops of food coloring in the tank, wait 15 minutes without flushing, and check the bowl. If color shows up in the bowl, the flapper is leaking water nonstop — hundreds of gallons a day, straight down the drain. A new flapper costs a few bucks and takes ten minutes.
Dripping faucets and irrigation leaks
Check every faucet, showerhead, and hose bib for drips — then go outside and walk the irrigation. Look for wet spots, geysers from broken sprinkler heads, and valve boxes full of water. One broken sprinkler head can out-waste a dripping faucet ten to one, and it runs while you sleep.
The water meter test
Turn off everything — all faucets, appliances, and irrigation. Go to the meter (usually at the curb), lift the lid, and watch the small dial or triangle for 10 to 15 minutes. Any movement at all means water is flowing somewhere it shouldn't — you've got a hidden leak. Photograph the reading so you can compare later.
Look for slab leak signs
A hot spot on the floor, the sound of running water when everything's off, damp carpet or baseboards that won't dry, water pressure that dropped, a water heater running constantly. If any of these show up, skip the rest of the list and call — a leak under the slab only gets more expensive with time.
Rule out new occupants and habits
New roommate? House guests for a month? Filled the pool, or put the landscaping on a new watering schedule? If the bill matches new usage, it's not a leak — it's math. But if nothing changed and the bill doubled, go back to step 3. Water is going somewhere it shouldn't.
Here's the truth: the water company won't find your leak for you.
They read meters. Finding the leak is on you — or on us.
The water company reads meters, not pipes
Call them about a high bill and they'll confirm the usage is real, maybe test the meter, and suggest you hire a plumber. That's where their job ends. The detective work — toilet dye tests, meter tests, leak detection — is yours or ours.
Silent toilet flappers cause most mystery bills
A worn flapper leaks 24/7 without a sound — no running water, no drip, nothing. The food coloring test takes 15 minutes and catches it. Always check toilets first, before you suspect anything expensive.
That's water going somewhere it shouldn't
Meters rarely lie. If your usage truly doubled and your household didn't change, this isn't a billing error — it's a leak. Toilet, irrigation, or a hidden line. The checklist above finds it in that order.
When to call a plumber.
If the checklist found nothing — or found something serious — it's our turn:
The meter moves with everything off
That's a confirmed hidden leak — water is going somewhere you can't see. Next step is professional leak detection to find exactly where, and that's our job. Call (818) 669-9019 any time, day or night.
You can't find the source
Checked every toilet, faucet, and sprinkler head, and the bill is still high? Then the leak is somewhere you can't get to — under the slab, behind a wall, underground. We find what you can't see.
Slab leak signs show up
Hot spot on the floor, damp carpet, the sound of running water with everything off — don't wait on these. A leak under the slab gets more expensive every day. See slab leak repair for how we handle it.
High water bill FAQ
Straight answers, no sales pitch.
Why did my water bill double all of a sudden?
Almost always a leak: a running toilet, a broken irrigation head, or a hidden line leak. Rule out new usage first, then run the toilet dye test and the water meter test — one of them usually names the culprit.
How does the food coloring test work?
Put a few drops of food coloring in the toilet tank and wait 15 minutes without flushing. If color appears in the bowl, the flapper valve is leaking tank water into the bowl nonstop — a silent leak that wastes hundreds of gallons a day.
Could my water meter be reading wrong?
It's rare. Run the meter test to check: turn everything off and watch. No movement means the meter isn't the problem; movement means water is genuinely flowing somewhere it shouldn't.
Can a broken sprinkler really spike my water bill?
Yes — it's one of the biggest culprits we see. A single broken sprinkler head can waste thousands of gallons a month. Walk your irrigation lines and look for geysers, soggy patches, or heads that never shut off.
Bill still a mystery?
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