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Expert Leak Detection Services in Mill Valley, CA

Leak detection from trained plumbing professionals. Same-day service available. Call today for free estimates!

Licensed & InsuredProfessionals
Quality WorkGuaranteed
Local ExpertsSince 1986
Fast & ReliableService

Why Mill Valley Homeowners Choose John Owens Services

Since 1986, we’ve helped homeowners throughout Marin County solve plumbing problems with honest recommendations and careful diagnostics. The John Owens Way is simple when it comes to gas, water, or slab leak detection: maintain your plumbing whenever possible, repair when needed, and recommend replacement only when it truly provides the best long-term value. If you are in need of a water leak repair, we are the gas and plumbing leak detection experts who can help!

  • FAST Aqua M300 professional leak-detection system, a 3-in-1 acoustic geophone, hydrogen tracer-gas detector, and pipe locator, the same premium tool water-utility crews and municipal contractors trust
  • Our technician trained in person at the FAST factory in Southern Germany, and the M300 carries 256 adjustable noise filters plus Pyramid Mode to cut through street traffic and background noise
  • More than 30 years operating professional leak-detection equipment, and a family business licensed (CA #501853) and bonded since 1986
  • Marin-based crews who know Mill Valley plumbing, from steep Homestead Valley supply runs to the older redwood-frame homes and aging copper lines around Tam Valley and Strawberry
  • Non-invasive detection that pinpoints the exact spot first, so any repair stays small and targeted instead of guesswork demolition
  • A 4.9-star Google rating from Marin and Sonoma neighbors, with upfront flat-rate pricing and a written diagnosis before any work begins

Signs You May Need Leak Detection

  • Unexpected increase in your water bill
  • Water meter moves when all fixtures are off
  • Warm spots on flooring or slab
  • Wet drywall or unexplained ceiling stains
  • Musty odors or mold growth
  • Low water pressure throughout the home
  • Running water sounds with no fixtures operating
  • Soft or wet areas in the yard
  • Visible moisture around your foundation
  • You suspect a hidden gas leak

Frequently Asked Questions

What types of leaks do you locate?

We locate water supply leaks, slab leaks, gas leaks, irrigation leaks, radiant heating leaks, and many other hidden plumbing leaks.

Will my walls or floors have to be opened?

The goal of our plumbing and gas leak detection services is to locate the leak as accurately as possible before any demolition begins using video leak detection equipment. Once the leak is identified, we’ll explain what access is needed for repair.

Can you repair the leak after finding it?

Yes. After diagnosing the source with our video leak detection technology, we can discuss repair options and complete many plumbing repairs.

Do you work on older Mill Valley homes?

Yes. We regularly offer plumbing and gas leak detection work on older homes throughout Mill Valley and understand the plumbing challenges commonly found in these properties.

What should I do if I smell natural gas?

Leave the area immediately, avoid creating sparks or flames, and contact your gas utility. Once the situation is safe, our gas leak detection company can inspect your gas piping.

Do you work on Eichler homes?

Yes. We are a leak detection cpmpany that has extensive experience with Eichler plumbing systems and radiant heating systems throughout Marin County.

Why is my water bill suddenly so high if I don’t see a leak?

A suddenly high water bill with no visible signs of a leak could mean you have a hidden leak. Hidden leaks can come from toilet flappers, irrigation systems, or underground pipes.

Can you locate a water leak under concrete without digging?

Yes! We use tools like acoustic listening devices and thermal imaging cameras to detect silent leaks beneath concrete slabs.

What equipment do professional leak detection companies use?

We use tools such as acoustic listening devices that can pick up sounds of a leak that the human ear is unable to process. Thermal imaging cameras can be used to locate leaks underground. We also use the FAST Aqua M300 that can use acoustic tech, tracer gas, and pipe location.

Proudly Serving Marin & Sonoma

From the Marin coast to Sonoma wine country, we bring honest plumbing, heating & cooling to homeowners across both counties — based locally since 1986.

Ready to Get Started?

Schedule service with our trusted local team today.

Serving Marin & Sonoma Counties

Good plumbing, heating, and air conditioning systems are vital in every North California home. John Owens Services, Inc. is proud to be the expert plumbing company you can count on