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Repair guide · Easy · 10 minutes

Is a Leak Hiding in Your Water Bill?

A water bill that jumps for no clear reason usually comes down to three things: irrigation, a running toilet, or a leak you cannot see. The meter at the curb tells you which one in about 10 minutes, with a flashlight and a screwdriver. Here is how to read it, and when the answer means calling us.

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Is a Leak Hiding in Your Water Bill?

What You Need

Know These Before You Start

Lifting a water meter box lid with a screwdriver
The meter box, lifted with a screwdriver
A water meter dial with the small red leak indicator
The leak indicator: the small red triangle
Food coloring seeping from the tank into the toilet bowl
A toilet dye test that found the leak

The Test, Step by Step

  1. Compare the right bills

    Hold this bill against the same month last year. Last month is the wrong comparison because summer irrigation can double a San Diego bill on its own. Most local agencies bill in HCF, and one HCF is 748 gallons. A jump of 5 HCF with nothing new in the house is about 3,700 gallons, and that is worth finding.

  2. Stop every use of water

    Turn off all faucets, the dishwasher, and the washer. Set the irrigation controller to off, and check that the ice maker, water softener, and any pool auto-fill are not running. The test only works if nothing in the house is supposed to be using water.

  3. Read the meter

    Lift the lid and find the small red triangle or star on the dial. If it is turning, water is going somewhere. For a slow leak it may not visibly move, so photograph the dial, wait 30 minutes without using any water, and photograph it again. Any change means a leak.

  4. Narrow it down

    Close the main shutoff at the house (our shutoff guide shows where it is). If the meter stops, the leak is inside: dye-test every toilet first, since a running toilet can waste up to 200 gallons a day, then check the water heater's relief valve drain line. If the meter keeps moving, the leak is outside the house. Irrigation often tees off before the house valve here, so close the irrigation valve too before you blame the main line.

Stop and call us if: the meter keeps moving with the house valve and the irrigation valve both closed, which points to the underground line between the meter and the house. Also call if you hear water running with everything off, feel a warm spot on a floor, or see damp drywall, a new crack, or a musty smell. Those are the signs of a slab or in-wall leak, and we locate those without opening up walls on a guess. Once the leak is repaired, ask your water agency about a leak adjustment on the bill; our invoice is the documentation they will want.

Meter still spinning?

Call and describe it. We will tell you what it likely is, what it usually involves, and how soon we can be there.

Related Guides & Services

What Customers Say About Paws Plumbing

Verified Google reviews from San Diego homeowners.

Josh SullivanPosted on Google
Five stars

"Made what I thought was a catastrophe into a quick and easy repair. I'll refer all my friends and family to use Corey at Paws Plumbing."

Roberta FossPosted on Google
Five stars

"Amazing professional experience. They understood the urgency and sent out a team who was extremely knowledgeable and had all the supplies with them. I found the pricing a good value for the high level of service."

Dominique O'BrienPosted on Google
Five stars

"I love these guys. They always go the extra mile to make sure the repairs are done right but also quickly."

The fastest way to reach us is a phone call.

Tell us what is going on and we will give you a real answer, a real timeframe, and an upfront price.

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