Novato, CA Leak Detection and Repair: Find Hidden Home Water Leaks

Estimated Read Time: 9 minutes

Hidden water leaks waste money, damage drywall and floors, and can grow mold fast. If you want to find hidden water leaks before they turn into big repairs, start with these proven steps you can do today and know when to call in a pro. We’ll show you exactly how homeowners across Santa Rosa, Petaluma, and Novato spot leaks early, plus how Ongaro & Sons confirms the source with advanced diagnostics and fixes it for good. Limited free‑consultation offers below.

1) Confirm a leak with the water‑meter test

Before you start opening walls, prove a leak exists. Your water meter is the most accurate early warning system you already own.

Turn off all fixtures and appliances that use water.
Locate the meter box at the curb or sidewalk. Write down the reading. If your meter has a small leak indicator dial, note whether it moves.
Wait 30 minutes without using water. Recheck. Any movement points to a leak. For precise results, wait 2 hours.
To isolate, shut off the house valve but leave the meter on. If the meter stops, the leak is inside. If it keeps spinning, suspect the service line from the street to the home.

Why it works:

The meter measures every drop. Even tiny pinholes and slab leaks show movement.
The house‑valve isolation step tells you if the leak is underground outside or somewhere inside the home.

Local tip: Many North Bay homes have meters in covered boxes that collect dirt and spiders. Bring a flashlight and gloves, and clear the dial so you can see the leak indicator clearly.

"We had a major leak on a Saturday and needed immediate help to set up a temporary line... We really appreciate their speedy service."

2) Dye‑test every toilet

Toilets are the most common hidden leak in a home. They can silently waste hundreds of gallons per day.

How to test:

Remove the tank lid.
Add 8–10 drops of food coloring into the tank. Do not flush.
Wait 10–15 minutes. If color appears in the bowl, the flapper or flush valve is leaking.

Fixes you can try:

Replace the flapper. It is a low‑cost part and a frequent culprit.
Check the chain for slack or tangles.
Inspect the fill valve height to ensure the waterline is below the overflow tube.

Professional help makes sense when:

The tank hardware is corroded or cracked.
You have repeated leaks after DIY repairs.
The shutoff valve or supply line also shows signs of seepage.

Savings note: Stopping a running toilet can save 200–300 gallons per day in extreme cases, which protects your water bill and local supplies during drought cycles.

3) Inspect faucets, fixtures, and supply lines

Small fixture leaks often hide in plain sight under sinks, behind toilets, or at the base of a faucet.

Do a five‑minute check in each bathroom and the kitchen:

Run warm water and watch for drips at the faucet spout after you shut it off.
Open the cabinet. Feel the shutoff valves and braided supply lines. Look for bulges, corrosion, or moisture rings.
Dry the cabinet base, then place a paper towel under traps and valves. Recheck in 24 hours for water marks.
Check the dishwasher, refrigerator, and washer hoses. Replace rubber hoses with braided stainless.

When a pro is better:

Older fixtures with hard‑to‑find parts.
Galvanized or mixed‑metal connections that are seizing up.
Leaks that return after you change a washer or cartridge.

At Ongaro & Sons, our service trucks are stocked with common cartridges and valves so most faucet and supply‑line leaks are fixed in one visit, with no return trip delay.

"Sal correctly diagnosed and fixed our leaky kitchen faucet... shows up on time and is tidy. Hats off to Ongaro."

4) Listen for slab, wall, and radiant floor leaks

Your ears can find what your eyes cannot. Continuous hissing or the sound of water movement when no fixtures are running can signal hidden leaks.

Try this simple sound test:

Turn off all water fixtures and appliances.
Stand in quiet areas, especially near water lines: behind showers, near the water heater, and along exterior walls where the main line enters.
Press a screwdriver handle to the wall or floor and the metal tip to your ear. You may hear vibration from a pressurized leak.

Warning signs that raise the stakes:

Warm spots on tile or hardwood that do not match radiant heat zones.
Damp, darkened grout lines or baseboards.
Moldy, musty odors in a closed room.

How pros confirm: We use electronic acoustic leak detection to pinpoint pressurized leaks and high‑resolution thermal imaging to map hot‑water radiant leaks under slab or finished floors. This precision minimizes demolition and speeds repair.

"Had the weirdest shower pipe break ever. Water everywhere. David... fixed a broken shower valve without taking out a chunk of wall."

5) Audit your water bill and daily usage

Your monthly bill is a trendline that tells a story. Spikes often align with new leaks.

What to look for:

Compare the last 6–12 months. A steady rise without lifestyle changes suggests a hidden leak.
Convert units to gallons per day. Many North Bay utilities show this online. If not, divide the bill’s total gallons by the billing days.
A typical two‑person household often averages 60–100 gallons per person per day. Numbers far above that can indicate leaks.

Fast isolation trick:

Choose a two‑hour window when no one is home. Snap a photo of the meter at the start and end. If gallons increased, there is a leak.

Why call a pro after a spike:

We can rule out fixture leaks fast, then move to service‑line, slab, or radiant systems.
Advanced diagnostics save time and avoid unnecessary drywall cuts.

6) Track moisture you cannot see with smart tools

You do not need to open walls to learn what is wet. Moisture and temperature patterns tell the truth.

What homeowners can use:

Moisture meters: Pin or pinless meters read drywall, wood, and flooring. Map high readings over time.
Thermal clues: On a cool morning, a damp wall can appear slightly cooler to the touch than a dry wall. While true infrared cameras are best, temperature differences can still be felt by hand.
Hygrometers: Track room humidity. Persistent high humidity in one room can suggest a hidden leak.

How we take it further:

Infrared thermal imaging pinpoints radiant floor leaks by showing hot‑water anomalies under concrete or finished floors, so we open only where needed.
Pressure testing zones isolates branches so we narrow the search quickly.

The benefit: Noninvasive confirmation avoids “search and destroy” approaches that lead to big repair bills and long downtime.

"Nico did a great job, very professional and thorough... found that the old basket strainer had leaked... Now, I don't have to worry about it."

7) Use camera and electronic leak detection for mains and sewers

Some leaks live underground or inside pipes you cannot see. That is when professional tools pay off.

Main water line diagnostics:

Video inspection and electronic leak detection identify breaks or corrosion along the line from the street to the house.
Isolation valves and pressure readings confirm whether water loss is before or after the house shutoff.

Sewer line investigations:

High‑definition sewer cameras show offsets, cracks, and root intrusions that cause leaks and backups.
If repair is needed, trenchless options such as pipe lining or pipe bursting often eliminate the need to dig up driveways or landscaping.

End‑to‑end advantage with Ongaro & Sons:

One team handles detection and repair, from fixture leaks to slab and sewer solutions. No juggling separate vendors.
Stocked service trucks resolve many fixture leaks in a single visit, while our trenchless crews tackle bigger issues with minimal disruption.

Preventive maintenance that prevents leaks later:

Annual hydro jetting clears buildup in sewers so small defects are found before they become breaks.
Join the Ongaro Maintenance Plan for scheduled checkups, reminders, and a 5% member discount on repairs and replacements.

When to call immediately:

Visible foundation seepage or pooling along the service line trench.
Sudden loss of water pressure throughout the home.
Saturated soil areas that never dry.

Special Offers for Leak Detection Services

Free Consultation in Bolinas, CA. Call 707-400-0274 or request service online. Expires 2026-02-04.
Free Consultation in Yountville, CA. Call 707-400-0274 or request service online. Expires 2026-03-04.

Schedule today and mention the Free Consultation offer. Limited availability.

Frequently Asked Questions

How do I know if my leak is inside the house or in the service line?

Use the meter test. Shut off your home’s main valve. If the meter stops, the leak is inside. If it keeps spinning, the service line from the street is likely leaking.

Can a toilet leak without making noise?

Yes. A worn flapper or flush valve can leak silently and waste hundreds of gallons per day. Use a dye test. If color appears in the bowl without flushing, parts need replacement.

Will thermal imaging find leaks under concrete or tile?

Thermal imaging is excellent for finding hot‑water radiant and slab leaks by mapping temperature changes. It helps target the exact spot to open for repair.

Are trenchless sewer repairs reliable?

Modern pipe lining and pipe bursting are proven methods with long service life. They avoid major digging, reduce downtime, and often cost less than full trenching.

What preventive steps reduce hidden leaks?

Replace old rubber hoses with braided lines, test toilets yearly, check valves and traps, and schedule annual sewer cleaning. A maintenance plan adds reminders and savings.

In Summary

Finding hidden water leaks early protects your home and budget. Start with the meter, test toilets, inspect fixtures, listen for hidden flow, and track usage. For tough cases, Ongaro & Sons confirms the source with camera inspections, electronic leak detection, and infrared thermal imaging, then repairs it right. Need help with leak detection in Santa Rosa or nearby? Call now or book online for fast, precise service.

Ready to Stop the Leak?

Call Ongaro & Sons at (707) 579-3511 or visit www.ongaroandsons.com to schedule now.
Mention our Free Consultation offer for Bolinas or Yountville by calling 707-400-0274 before the listed expiry dates.
Serving Santa Rosa, Petaluma, Novato, Rohnert Park, Windsor, Healdsburg, Sonoma, St. Helena, Cotati, and Sebastopol.

Protect your home today with expert leak detection and repair.

About Ongaro & Sons

Founded in 1932, Ongaro & Sons is a fourth‑generation, family‑owned contractor serving Sonoma and Marin counties. We deliver plumbing, HVAC, and electrical services with Diamond Certified quality, BBB A+ standards, and flat‑rate, upfront pricing. Our PHCC‑ and NATE‑certified technicians back every job with a 100% satisfaction guarantee. From noninvasive leak detection to trenchless sewer repairs, we bring one team for every trade, so your project runs fast and right the first time.