Why Is My Water Bill So High? 7 Hidden Causes in Canton, GA

You open your water bill and it’s double last month’s. Nothing changed in the house — no guests, no new appliances, no visible leaks. A sudden spike almost always means one of seven hidden causes, and the most common one — a silent running toilet — can waste 200–1,000+ gallons a day without making a sound you’d notice.

We’ve been finding hidden leaks across Canton, Cherokee County, and North Georgia for 25+ years as a licensed Georgia Master Plumber operation, and the same one crew handles both the plumbing side and the septic side of every diagnosis. Start with the meter test below, then work the list.

Run the 15-Minute Meter Test First

Before hunting for a cause, confirm the leak exists and figure out which side of the meter it’s on:

1. Turn off every water-using fixture and appliance — toilets, ice maker, dishwasher, washing machine, irrigation.
2. Find your water meter, usually in a covered ground box at the curb or property line.
3. Watch the small triangular or star-shaped leak indicator dial for 60 seconds.
4. If the dial moves with everything off, you have a real leak between the meter and your fixtures.
5. Close your home’s main shutoff valve, wait 5 minutes, and check again. Dial stopped: the leak is in the buried supply line between meter and house. Dial still moving: the issue is upstream, likely the meter or utility side.

The 7 Hidden Causes at a Glance

Cause 1: The Silent Running Toilet

The number one culprit by a wide margin. A worn flapper lets water seep from tank to bowl continuously, and the fill valve quietly tops the tank off every few minutes. On Cherokee County water and sewer rates, that’s $20–$100+ added to a single monthly bill.

Test it: put a few drops of food coloring in the tank, don’t flush, wait 15 minutes. Color in the bowl means water is bleeding past the flapper. Test every toilet in the house. The fix is a $10 flapper and 10 minutes.

Cause 2: An Underground Water Line Leak

The pressurized supply line from your meter to your house is buried in North Georgia red clay, which hides leaks well — water disappears into the ground until the bill arrives. Watch for a wet spot that never dries, a strip of grass greener than the rest, spongy ground between the meter and house, or a pressure drop alongside the bill jump.

Don’t dig blind. Acoustic leak detection pinpoints the failure within a few feet, so water line repair means one hole, not a trenched yard. Spot repairs in the Canton area run $800–$2,500; full line replacement runs $3,500–$8,000 when the pipe is too far gone to patch. If water is actively surfacing or pressure has collapsed, treat it as an emergency plumbing call.

Cause 3: An Irrigation System Leak

A stuck zone valve, a cracked sprinkler head, or a split poly line can pour water into the ground around the clock — especially sneaky when the system runs at night. Shut the irrigation system’s isolation valve and repeat the meter test with it open versus closed. If the dial only moves with irrigation live, you’ve found it.

Cause 4: A Water Heater Leaking or Cycling

Two patterns show up on bills before they show up as puddles: a rusting tank bottom seeping into a pan or floor drain, and a temperature-and-pressure relief valve that leaks or cycles continuously through a discharge pipe you never look at. Check the tank base and the T&P discharge line for moisture. A failing T&P valve is a modest repair; a leaking tank means replacement — see our water heater repair page for how we call that line.

Cause 5: A Slab Leak

On slab-foundation homes, supply lines run under the concrete. Warning signs: warm spots on the floor, the sound of running water with everything off, moisture at baseboards, a new musty smell. Slab leaks need professional acoustic and thermal detection before anyone cuts concrete, and they damage foundations if ignored — don’t sit on this one.

Causes 6 and 7: Softener Stuck Regenerating, or a Meter Error

A water softener stuck in regeneration can burn hundreds of gallons a day — check whether its drain line is running constantly. And before assuming the worst, compare the meter reading on your bill to the actual meter. If the bill shows more than the meter reads, or the prior bill was estimated, call the utility. Cherokee County-area utilities will usually verify a suspect meter on request.

One more tip: many utilities grant a one-time leak adjustment on your bill if you document that you found and fixed a leak. Ask.

Not Sure If It’s Plumbing or Septic?

High bills are a supply-side problem, but the extra water has to go somewhere — and on septic, a running toilet quietly floods your tank and drain field too. If drains are also acting up, our septic or plumbing guide helps you sort out which system is talking. Because our crew does both, one visit answers the question either way.

FAQ

How much can a small leak actually cost per month?

A silent toilet wastes 200–1,000+ gallons a day; a pinhole line leak wastes 5–10 gallons an hour, or 3,500–7,000 gallons a month. On typical Cherokee County water plus sewer rates, that’s $30–$150+ extra monthly, growing as the leak grows.

Should I call the utility or a plumber first?

Run the meter test. Dial stops when your main shutoff closes: the leak is yours, call a plumber. Dial keeps moving with the shutoff closed, or doesn’t move at all yet the bill is high: call the utility about the meter.

Can you find an underground leak without digging up the yard?

Yes. Acoustic leak detection picks up pressurized water escaping the pipe and usually locates it within a few feet, so we dig one spot. For slab leaks we add thermal imaging when needed.

Does homeowner’s insurance cover a leak like this?

Usually not the wasted water itself, but resulting property damage may be covered. Many policies exclude the buried service line unless you carry a service line endorsement — worth a call to your agent.

If you’ve confirmed a leak and want it found and fixed by one local crew, contact us or call (678) 758-3493 — Precision Plumbing & Septic answers 24/7 with a 60-minute emergency response target across Cherokee County.