Why Did My Water Bill Go Up? How to Find a Hidden Plumbing Leak in Your Home

If your water bill jumped and your habits didn't change, the most likely cause is water leaving your plumbing system somewhere you can't see it. A running toilet, a dripping fixture, a leaking supply line under a slab or in a crawl space, or a cracked underground service line will all keep the meter turning around the clock. The fastest way to confirm it: shut off every water fixture in the house, then check whether your water meter is still moving.

That single test tells you whether you're dealing with a leak or a billing issue. Below is how to run it, what the common culprits are, and when it's worth calling a licensed plumber instead of chasing it yourself.

Step 1: Run the water meter test

This takes about 20 minutes and costs nothing.

• Turn off every fixture and water-using appliance. No dishwasher, no washing machine, no ice maker cycling, no irrigation.
• Find your water meter, usually in a box near the street or curb.
• Look at the leak indicator — a small triangle, star, or spinning dial on the face. If it's moving with everything off, water is running somewhere.
• If there's no indicator, write down the exact reading, wait one to two hours without using any water, and read it again. A changed number means a leak.

If the meter is moving, the next question is whether the leak is inside the house or between the meter and the house. Close your main shutoff valve where the water line enters the home, then check the meter again. Still moving? The leak is likely on the underground service line. Stopped? It's somewhere inside.

Step 2: Check your toilets before anything else

Toilets are the number one source of silent water waste in a home, and they're the easiest to rule out. A worn flapper lets water seep from the tank into the bowl continuously — often with no sound at all.

To test it:

• Remove the tank lid.
• Add a few drops of food coloring to the tank water.
• Wait 15 to 20 minutes without flushing.
• If color shows up in the bowl, the flapper or flush valve is leaking.

A toilet that hisses, refills on its own, or has a phantom flush is doing the same thing, just more audibly. That water runs every hour of every day, which is exactly why it shows up on a bill before it shows up on your floor.

Common reasons a water bill goes up

Dripping faucets and showerheads

A slow drip seems harmless. But it runs continuously, and on a hot water line it's also costing you energy to reheat water you never use. Worn cartridges, washers, and O-rings are the usual cause, and fixture repair or replacement is straightforward work.

A leak under a slab, in a wall, or in a crawl space

These are the ones homeowners rarely catch early. Pressurized supply lines can weep behind drywall, under concrete, or into a crawl space for months. Warning signs include warm spots on the floor, a musty smell, a section of carpet or drywall that stays damp, water pressure that drops for no reason, or the sound of running water when nothing is on.

Irrigation and outdoor spigots

Underground sprinkler lines, cracked valves, and a hose bib that was never properly winterized are common causes of a spring or summer spike. In colder Central Oregon communities like Bend, Sisters, La Pine and Prineville, freeze damage often doesn't reveal itself until the system is pressurized again.

Water heater problems

A leaking tank, a failing temperature and pressure relief valve, or a bad connection at the top of the heater can drip steadily into a pan or drain where you never look. If the water heater is also struggling to keep up, it's worth having it evaluated for repair versus replacement.

Water pressure that's too high

Excessive incoming pressure stresses every joint, valve, and fixture in the house. It creates drips, shortens the life of appliances, and can cause repeat failures after repairs. A pressure regulator issue is worth checking if you keep losing fixtures.

Sewer or drain line issues

A sewer line problem won't raise your water bill directly, but it often shows up alongside other plumbing trouble — slow drains throughout the house, gurgling toilets, soggy spots in the yard, or backups. A sewer camera inspection tells you exactly what's going on underground instead of guessing.

Signs of a hidden leak, even when the bill looks normal

Watch for:

• Water stains, bubbling paint, or discolored patches on ceilings and walls
• A musty or earthy smell in one room, closet, or the crawl space
• Floors that feel warm, soft, or spongy in a specific spot
• Mold in an area that shouldn't get wet
• A section of lawn that's greener or soggier than the rest
• Water pressure that has quietly dropped
• The sound of running water with every fixture off

Any one of these on its own is worth a look. Two or more together usually means water has been moving for a while.

When a leak becomes an emergency

Call right away rather than waiting for a scheduled appointment if you have:

• A burst or actively spraying pipe
• Water pooling near an electrical panel, outlets, or the furnace
• A flooding crawl space
• A sewer backup or overflowing toilet
• Water you can't stop, or a main shutoff valve that won't close

Emergency plumbing service is available throughout Central Oregon, Portland, and Washington communities including Vancouver, Tacoma, Seattle, Belfair and Silverdale. In Bend, Tacoma and Puyallup, emergency response is available 24/7. If you're not sure whether it qualifies as an emergency, shut off the main water valve first, then call.

How professional leak detection actually works

You don't have to open walls to find a leak. A licensed plumber isolates the problem systematically — pressure testing lines, checking fixtures and shutoffs, inspecting crawl spaces and slabs, and using camera inspection on sewer and drain lines. The goal is to locate the leak precisely so the repair is targeted instead of exploratory.

From there, the fix depends on what's found: pipe repair at a single failure point, fixture or toilet replacement, water heater repair, water pressure regulation, or — when a system has failed repeatedly — whole-home repiping.

What to expect on every job: clear scheduling confirmation, licensed and insured technicians, upfront flat-rate pricing before any work begins, clean job sites, and transparent communication.

Pricing is quoted flat-rate up front, so you know the number before the work starts, not after. Financing options may be available for qualifying projects — ask the team about details and approval requirements.

Can a small drip really raise my water bill that much?

Yes — because it isn't small over time. A drip or a seeping toilet flapper runs 24 hours a day, seven days a week, whether you're home or not. That's why a leak most homeowners can't hear often shows up as a noticeable jump on a single billing cycle. The fixture repair is usually minor; the water lost while you wait is not.

Should I keep watching it, or fix it now?

If the meter confirms water is moving with everything off, the leak isn't going to resolve on its own. Pressurized leaks tend to get worse, and the secondary damage — subfloor, drywall, insulation, cabinetry, mold — is almost always more expensive than the plumbing repair itself. Finding it early is the cheapest version of this problem.

Get the leak found and fixed — and save 5%

Einstein Pros provides leak detection, water leak repair, pipe repair, repiping, toilet and fixture repair, water heater service, drain cleaning and sewer line services for homeowners and property managers across Oregon and Washington. Same-day or next-day service is available in many cases, depending on availability and urgency.

Right now: 5% OFF qualifying leak repairs. Stop the Drip. Stop the Waste.

Found a leak, or noticed water usage you can't explain? Schedule your leak repair with Einstein Pros and save 5%. Online service requests are often answered within minutes during business hours.

Or call the number for your area:

• Central Oregon (Bend, Redmond, Sisters, Sunriver, La Pine, Prineville, Madras): (541) 420-8888
• Portland & Vancouver, WA: (503) 821-4070
• Salem, OR: (503) 837-8470
• Tacoma, Seattle, Puyallup, Bremerton, Silverdale, Port Orchard, Belfair: (253) 533-9060
• Toll-free: (888) 671-7767

Office hours are Monday to Friday, 7:30 a.m. to 4:30 p.m., except holidays. Email support@einsteinpros.com.