Why Is My Water Bill So High?

A water bill that jumps suddenly is unsettling, and the first question is always the same: where is the water going? In Olathe, a slab leak is the first cause to rule out when the increase is large and nothing in your household has changed. A leak under the slab runs 24 hours a day, and even a pinhole can waste hundreds or thousands of gallons before you notice anything else. But a slab leak is not the only possibility, and this guide works through the other common causes so you can narrow it down before you call anyone.

Start by comparing like with like. Look at the same month in prior years, not just last month — summer irrigation and winter guests both move the numbers, and a year-over-year comparison strips that out. If usage is up sharply against the same month last year, and your household, habits and garden have not changed, something is leaking. Our slab leak detection and repair in Olathe team can confirm or rule out a slab leak with a pressure test, but first, here is how to check the other suspects yourself.

Cause #1: A Slab Leak

A slab leak is the most serious cause of a high bill, and the one to check first when the jump is big. The leak is in a pipe under your concrete foundation, so you will not see it directly — but the bill is often the first sign. Look for the other clues in our 9 signs of a slab leak guide: warm spots on the floor, the sound of running water with everything off, low pressure, damp flooring, or soggy soil outside. If any of those are present alongside the high bill, skip the rest of this list and do the meter test below. Detection in Olathe has a typical range of $150–400, averaging about $280, and it gives a confirmed answer before any concrete is opened.

Other Common Causes

A Running Toilet

A toilet that runs constantly is the most common household cause of a high bill, and it is also the easiest to miss — a toilet can run quietly for weeks. A worn flapper or a fill valve that does not shut off can waste a large amount of water every day. Lift the tank lid and watch: if water is flowing into the overflow tube, or the tank refills on its own every few minutes, the toilet is the culprit. A few drops of food colouring in the tank will show up in the bowl within 15 minutes if the flapper is leaking.

Dripping Fixtures

A dripping tap, a shower head that never quite stops, or a hose bib that seeps will add up over a billing cycle. One drip per second is a small amount on its own, but several fixtures dripping around the clock can move the bill noticeably. Check every tap, shower, and outdoor spigot, and look under sinks for slow leaks at supply connections.

Irrigation and Outdoor Water Use

In Olathe, irrigation is a seasonal suspect. A broken sprinkler head, a cracked lateral line, or a controller that is running longer than you think can use a great deal of water, especially in a dry summer. Check for soggy patches in the lawn, heads that spray oddly, and zones that run when they should not. A hose left running, or a pool that is being topped up often, can also explain a jump.

A Water Heater Problem

A water heater with a leaking temperature-and-pressure relief valve, or a tank that is dripping at a fitting, can waste water steadily into a drain or onto the floor. Check around the base of the heater and at the discharge pipe from the relief valve. A heater that is constantly reheating because of a leak will also show up on your energy bill, not just your water bill.

Seasonal and Household Changes

Before you assume a leak, rule out the ordinary: guests staying over, a new baby, a filled pool or hot tub, a new garden bed, or a change in irrigation schedule. If none of those apply and the year-over-year comparison still shows a sharp rise, the water is going somewhere you cannot see — and that points back to a hidden leak.

How to Check With the Meter Test

The meter test is free and takes 15 to 20 minutes. Turn off every tap, toilet, shower, dishwasher, washing machine, ice maker and irrigation system. Make sure nobody uses water during the test. Read your water meter and write down the number, including the small leak-indicator dial if your meter has one. Wait 15 to 20 minutes without using any water, then read it again. If the reading changed, water is flowing somewhere in your system. Next, narrow it down: if you suspect a toilet, turn off the toilet supply valves and repeat the test. If the meter still moves with everything off, the leak is in the supply system — and a slab leak is a likely candidate, especially in an older Olathe home with copper under the slab. Photograph both readings and keep your recent bills; that record helps a technician and is useful if you need to talk to your insurer. Our guide to how slab leak detection works explains what happens on a detection visit.

A high bill is a warning, not a diagnosis — but it is a warning worth acting on quickly. A leak that runs for another month costs you the water, and it soaks more soil and flooring in the meantime. If the meter test is positive, call (913) 369-6679. Our Olathe slab leak repair team serves Olathe only, ZIP codes 66051, 66061, 66062, 66063 and 66215.

Frequently Asked Questions

Why is my water bill suddenly so high?

The most common causes are a hidden slab leak, a running toilet, a dripping fixture, an irrigation leak, or a water heater problem. A slab leak is the first cause to rule out when the jump is large and nothing in your household changed, because a leak under the slab can waste hundreds or thousands of gallons a day.

How can I tell if a high water bill is a slab leak?

Do the water meter test: turn off every fixture and water-using appliance, note the meter reading, wait 15 to 20 minutes without using any water, and read it again. If the meter moved, water is flowing somewhere it should not be. Also check for warm floor spots, the sound of running water, and damp flooring.