Water, gas, and slab leak detection across Sebastopol. Call today to schedule same-day service and free estimates!
John Owens Services has been the licensed professional of Sebastopol when it comes to leak detection since 1986. With our access to high-tech leak detection equipment, we make sure no leak goes unchecked.
Call or request service for suspected water or slab leaks in Sebastopol. We use the FAST Aqua M300 to help locate hidden leaks and explain repair options. Our team will confirm appointment availability. If you suspect a gas leak, leave the area and contact your gas utility first.
We run the FAST Aqua M300, a premium, professional-grade leak-detection system that water-utility operators, leak-detection technicians, and municipal contractors rely on. It works as a 3-in-1 tool, an acoustic geophone, a tracer-gas detector for hydrogen, and a pipe locator when paired with a pulse-wave generator, with 256 adjustable filters and a Pyramid Mode that cuts through heavy street traffic and background noise. Our technician trained in person at the FAST factory in Southern Germany, so we run this equipment the way it is meant to be run, not guessing at settings in the field.
Some Sebastopol homes are built on a concrete slab, which means the plumbing runs underneath it, and many of those slabs have radiant heating built in. A radiant slab leak happens when the slab cracks and the embedded pipe expands and contracts until it fails, and you lose both water and heat. Copper water lines under a slab corrode over time from minerals in the groundwater, and older drain or sewer piping under a slab can corrode too, which lets sewage leak under the home, a real health hazard. Finding a leak under a slab takes the right equipment and a trained technician, which is exactly what the FAST Aqua M300 and our factory training are built for.
A high water bill, or a well pump that cycles more than it used to, is usually the first sign of a hidden water leak, whether it is along a buried service line, under a slab, or inside the house. Some Sebastopol homes now have automatic water-leak detection systems that track flow and shut the water off on their own if something is wrong, then alert you by phone.
Gas leaks are one of the most dangerous things that can happen to your home. If a leak is present, the house will start to smell like rotten eggs, and it is noticeable fast. If you smell that, get everyone out of the house immediately and call your gas company and 911 before doing anything else. Gas leaks are often caused by misfitted, damaged, or corroded pipes. Shutting off the gas is the first step, but the leak still needs to be located and the line repaired before gas service can be safely restored, which is exactly the kind of work John Owens Services handles.
We locate leaks as accurately as possible before any demolition begins. Once we have the lcoation of the leak, we discuss the best method of accessing it for repair.
Even something as simple as a leaky toilet flapper can waste 200 to 4,000 gallons a day, which is not dangerous but adds up fast on your bill.
Yes! Since we offer plumbing repair services as well as leak detection services, we can provide gas, water, or slab leak repair after we’ve found the leak.
We can find the source of slab leaks, water leaks, gas line leaks, radiant heat leaks, and leaks hidden in ceilings, floors, and walls.
In the last two years our technicians completed 12 leak detection jobs at Sebastopol homes, most recently in August 2026.
Most of that work is in Sebastopol ZIP code 95472.
Counts are completed jobs from our own service records, updated October 2026.
From the Marin coast to Sonoma wine country, we bring honest plumbing, heating & cooling to homeowners across both counties — based locally since 1986.