Why is my water bill so high?
A sudden jump in your water bill almost always means water is escaping somewhere it shouldn't. The most common cause by far is a running or silently leaking toilet — followed by dripping faucets, irrigation leaks, and hidden pipe or slab leaks.
Not every spike is a leak, though. More laundry, longer showers, extra lawn watering in our dry months, or houseguests can all raise a bill on their own. The trick is ruling out a leak first, because a small, steady leak runs around the clock and adds up fast — and the sooner you catch it, the less water (and money) you waste.
What are the usual culprits?
Most high-bill mysteries trace back to a short list of repeat offenders. Start with the toilets — they cause more surprise bills than anything else in the house.
- Running or leaking toilet (#1): a flapper that doesn't seal lets water trickle from the tank to the bowl around the clock — usually with no sound at all.
- Dripping faucets & fixtures: a single slow drip looks harmless but runs continuously, day and night.
- Irrigation & sprinkler leaks: a cracked line, broken head, or stuck valve outdoors is easy to miss until the bill arrives.
- Slab leak: a supply pipe leaking beneath the concrete slab — common in Florida slab-built homes and invisible until it shows up on the meter.
- Seasonal use & guests: sometimes it really is just more people, more laundry, and more watering — no leak at all.
Start with the toilets
If you only check one thing, check your toilets. A leaking flapper is the most common cause of a surprise bill and the easiest to confirm — and a new flapper is an inexpensive fix you can often handle yourself.
How do I find the cause?
You can narrow it down yourself in under an hour with two simple tests — no special tools required.
- The water-meter test: turn off every fixture and appliance that uses water, note the meter reading, then wait an hour or two without using any water and check again. If it moved, you have a leak.
- The toilet dye test: put a few drops of food coloring in the tank, wait about 15 minutes without flushing, and check the bowl. If color appears in the bowl, that toilet's flapper is leaking.
If the meter moves but every toilet passes the dye test, the leak is elsewhere — a faucet, the irrigation system, or a hidden line. That's your cue to look closer or bring in help.
Quick fixes vs. when to call a pro
Some causes are a quick do-it-yourself fix; others mean it's time to bring in a plumber before the waste — and any water damage — grows.
Worth trying yourself first:
- Replace a worn toilet flapper or fill valve.
- Swap a dripping faucet washer or clean a leaking aerator.
- Repair an obvious broken sprinkler head or outdoor spigot.
Call a pro when:
- The meter keeps moving with everything off and your toilets pass the dye test.
- You notice warm spots on the floor, the sound of running water, or unexplained moisture.
- The bill stays high even after you've fixed the obvious drips.
When it points to a hidden leak
If the easy checks come up empty but the meter keeps spinning, the leak is hidden — inside a wall, underground, or beneath your slab. That's where professional tools earn their keep.
A plumber can pinpoint the source without guesswork or tearing your home apart. See how the process works in our guide to leak detection, and if you live in a slab-built home, read about slab leaks in Florida homes — a common and sneaky cause here on the Space Coast.
Don't ignore a leak that won't show itself
A hidden leak doesn't just waste water — left alone it can damage flooring, walls, and the slab, and create the moisture mold loves. If your meter is moving with everything off, treat it as urgent.
How Anna's helps
When a leak won't reveal itself, Anna's locates and fixes it across Melbourne, Palm Bay, Viera, Rockledge, and the wider Space Coast — with same-day and 24-hour emergency service when water is actively running up your bill.
We're a woman-owned, licensed and insured local team with around a 4.9-star Google rating, and we'll explain what we find before we fix anything. Explore our plumbing services, or if you're already holding a repair quote, get a free second opinion before you commit.