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Leak Repair in Fontana, CA

Even small plumbing leaks can cause serious damage if left unaddressed. A. O’Dowd Plumbing provides reliable leak repair services in Fontana, CA, helping homeowners and businesses quickly identify and fix leaks before they lead to water damage, mold growth, or costly repairs. Our plumbers focus on accurate diagnosis and long-lasting repairs to restore the integrity of your plumbing system.

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Professional Leak Detection & Plumbing Leak Repair Services

Even small plumbing leaks can cause serious damage if left unaddressed. A. O’Dowd Plumbing provides reliable leak repair services in Fontana, CA, helping homeowners and businesses quickly identify and fix leaks before they lead to water damage, mold growth, or costly repairs. Our plumbers focus on accurate diagnosis and long-lasting repairs to restore the integrity of your plumbing system. Our leak repair services are part of our complete plumbing services in Fontana, CA.

Water leaks are one frustrating problem that home and business owners often encounter when they least expect it. Suddenly you have gotten your water bill and it is much higher than usual and you start to wonder if you may have a leak of some kind. If this scenario has happened to you before, you know how annoying it is to have a water leak, and not only that, but they can become very expensive if you cannot find it or don’t know that it is happening. A water leak can consist of a leak from a pipe, fixture, or a water line. No matter where the leak is coming from, you will need a plumbing leak repair right away to get it to stop. 

Pipe Leak Repair

Leaks in water supply lines or drain pipes can waste water and weaken surrounding materials. We repair leaking pipes caused by corrosion, joint failure, shifting pipes, or aging plumbing systems. Our team locates the source of the leak and applies the appropriate repair method to prevent recurring issues.

Fixture Leak Repair

Leaking faucets, sinks, toilets, and shower fixtures can increase water bills and cause hidden damage behind walls or cabinets. Our fixture leak repair services address worn seals, faulty valves, loose connections, and damaged components to restore proper operation and eliminate unnecessary water loss.

Hidden Leak Detection

Some plumbing leaks are not immediately visible and may occur behind walls, under floors, or beneath concrete slabs. We use proven leak detection methods to locate hidden leaks without unnecessary damage to your property. Early detection helps reduce repair costs and prevents long-term structural issues. In cases where leaks occur beneath concrete foundations, professional slab leak repair may be required to prevent structural damage.

Water Line Leak Repair

Leaks in main water lines or underground plumbing can affect water pressure and lead to significant water loss. Our water line leak repair services identify compromised sections of piping and provide effective repairs or replacements to restore reliable water delivery and system performance. Sudden or severe water line leaks may require emergency plumbing services to reduce water damage and restore service quickly.

Signs You May Have a Plumbing Leak

Plumbing leaks are not always obvious. Common warning signs include unexplained increases in water bills, damp spots on walls or floors, reduced water pressure, musty odors, or the sound of running water when fixtures are not in use. Addressing these signs early can help prevent major plumbing damage.

Schedule Leak Repair in Fontana, CA

If you suspect a plumbing leak or need professional leak repair in Fontana, CA, A. O’Dowd Plumbing is ready to help. Call today to speak with a licensed plumber or request a free service quote to receive dependable leak detection and repair solutions. Our licensed plumbers provide dependable solutions across all plumbing services in Fontana, CA, ensuring your system is repaired correctly the first time.

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Check It Yourself

How to Check for a Hidden Leak at Home

Many leaks stay out of sight for weeks. These two quick tests help you find out whether water is escaping before you see damage.

The Water Meter Test

  • Turn off every faucet, appliance and irrigation system
  • Find your water meter and note the reading or leak indicator
  • Wait 15 to 30 minutes without using any water
  • If the reading changes or the indicator moves, water is leaking somewhere on your property

The Toilet Dye Test

  • Add a few drops of food coloring to the toilet tank, not the bowl
  • Do not flush for 15 minutes
  • If color appears in the bowl, the flapper is leaking
  • A leaking toilet can waste a lot of water without making a sound

If the meter moves and you cannot find the source, call (909) 684-1915 and we will track it down.

Types of Leaks

Common Household Leaks and What They Mean

Where a leak is located shapes how it is found and fixed. Here are the types we repair most.

Leak TypeCommon Warning SignsTypical Cause
Fixture leakDripping faucet, running toilet, wet cabinet under a sinkWorn washers, flappers, valves or supply connections
Pipe leak in a wall or ceilingStains, bubbling paint, musty smell, sound of running waterCorrosion, pinholes or failed joints
Slab leakWarm spots on the floor, rising water bill, cracked tile. See slab leak repairCorroded pipes or shifting ground under the foundation
Main water line leakLow pressure, soggy yard, unexplained high billAge, corrosion, root damage or soil movement
Water heater leakWater pooled around the base, rusty tank. See water heater repairFailing valves, loose fittings or a corroded tank
Local Conditions

Why Fontana Homes Develop Leaks

Hard Water Corrosion

Fontana's hard water, often 15 to 25 grains per gallon, builds scale and corrodes pipes and fixtures. A water treatment system protects your plumbing.

Aging Plumbing

Homes built from the 1960s through the 1990s may have original copper supply lines near the end of their service life, and pinhole leaks are often the first sign.

Clay Soil and Ground Movement

Shifting clay soil and seismic activity stress underground water lines and slab plumbing, opening leaks that are hard to see.

Found a Leak? Call Us Today

Do not wait for a small leak to become a big repair. Call A O Dowd Plumbing for same-day leak repair in Fontana, or see our emergency plumbing page for active flooding.

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The Cost of Waiting

What Happens If You Ignore a Plumbing Leak

Higher Water Bills

A hidden leak runs around the clock, and you pay for every gallon even if you never see it.

Mold and Water Damage

Moisture trapped in walls, floors and ceilings leads to mold, rot and damaged drywall, flooring and cabinets.

Structural Problems

Long-term leaks can undermine flooring and the soil around your foundation, turning a small repair into a major one. If it keeps happening, our guide to whole-house repiping explains when to replace instead of patch.

Related Services

More Plumbing Help for Leaks and Repairs

Slab Leak Repair

Leaks under your foundation need specialized diagnosis and repair.

Slab leak repair →

Water Heater Repair

A leaking water heater is one of the most common household leaks.

Water heater repair →

Emergency Plumbing

A burst pipe or active flooding cannot wait. We respond 24/7.

Emergency plumbers →

Kitchen & Bathroom Plumbing

Faucets, supply lines, toilets and shower valves that drip or leak.

Kitchen and bath plumbing →

Water Treatment & Softeners

Reduce the hard water corrosion that wears out pipes and fixtures.

Water treatment →

Plumbing Services

See everything we offer for homes and businesses in Fontana.

All plumbing services →
Service Areas

Leak Repair Near Fontana

We repair leaks across the Inland Empire. Select your city to learn more.

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Common Questions

Leak Repair FAQs

How do I know if I have a hidden water leak?

Warning signs include an unexplained jump in your water bill, the sound of running water when everything is off, damp or discolored walls and ceilings, musty smells, warped flooring, and low water pressure. You can also run the water meter test above. Our guide on finding a hidden water leak before it gets worse covers more.

How do I check for a leak using my water meter?

Turn off every faucet and appliance that uses water, then look at your water meter. If the leak indicator is spinning or the numbers change after 15 to 30 minutes with no water in use, you likely have a leak somewhere between the meter and your fixtures.

What causes pinhole leaks in copper pipes?

Pinhole leaks form when corrosion eats through the pipe wall from the inside. Hard water, high mineral content and the age of the pipe all contribute. If your home has repeated pinhole leaks, the underlying pipe is wearing out, and whole-house repiping may be a better solution than patching each leak.

Can I fix a leak myself?

Simple fixture leaks, such as a dripping faucet washer or a loose connection, can sometimes be handled by a homeowner. Leaks inside walls, under the slab or in the main water line need a plumber, and waiting can cause far more damage than the repair itself.

What should I do if I find a leak?

Shut off the water to the leaking fixture or the main water valve, then call a plumber. Move belongings away from the water, take photos of any damage for your records and avoid contact with water near electrical outlets. For active flooding, see our emergency plumbing page.

Do you offer same-day leak repair in Fontana?

Yes. We offer same-day leak repair in Fontana and nearby cities, and 24/7 emergency service for active leaks. Call (909) 684-1915.

Call (909) 684-1915 for Leak Repair

A O Dowd Plumbing Inc. did an amazing job with the water heaters I needed repaired. The team was friendly and professional all around. They communicated well from beginning to end - even followed up to make sure everything was working well

Avatar Milton Campos Google Review

As a small business owner, reliability and being punctual is a rare but precious quality that we seek in vendors and technicians. Needless to say, this year was extremely difficult for small business owners.

Alex Chen Google Review

I had some issues with my boiler and their website was very clear on their expertise in that boiler so I called right away. They were were a little outside my area so Jason spent 15-20 minutes over the phone walking me though how to diagnose and fix it myself. I was able to get it up and running.

Emil Schaffroth Google Review

Our water pressure regulator broke just past dinner time, we had to turn the water off so the super-pressurized water doesn’t run and damage our pipes and stuff. Jason responded that night and was able to get everything fixed by lunch time on the next day.

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