Google review
Had a leakage with shower head and found them on Thumbtack. They came out same day and fixed it the same day too! Explained the issue very well and offered multiple options for repair. Highly recommend
Yaoqi Dong
Jun 21, 2025
Available for Booking
Leak Detection & Repair in San Mateo, CA
Leak detection and repair for San Mateo homes with unexplained water bills, damp floors, or mold concerns. We locate slab leaks, hidden pipe leaks, and fixture drips with minimal disruption, then repair ? not just detect. Upfront pricing after we identify the source.
- 60 Years Combined Experience
- Licensed & Insured
- Emergency Service
- Transparent Pricing
Request service
Fast response — no obligation
10% OFF
Limited Time Offer
Any plumbing service
Call (415) 728-6391 — cannot be combined with any other offer or coupon.
Finding hidden leaks before they spread in San Mateo
Finding hidden leaks
Acoustic listening, pressure testing, and moisture mapping narrow the search before we open walls or slab. You approve the repair path once the source is confirmed.
Slab leaks in San Mateo homes
Warm floor spots, unexplained water bills, and low pressure together often signal a hot line under concrete. We locate and repair with as little demolition as practical.
Repair included
Detection without repair leaves you with a map and another bill. We fix what we find ? supply lines, fixture connections, and irrigation cross-connections when they affect the meter.
Why ASAP
Why San Mateo homeowners choose us
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Licensed & insured
Every job is completed by licensed plumbers with full liability coverage.
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Find hidden leaks
We locate slab leaks, pipe leaks behind walls, and fixture drips with minimal disruption.
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Upfront pricing
We explain the problem and quote before work begins — no surprise charges.
Locate and repair - not just detect - in San Mateo
Insurance documentation
We note findings clearly for adjusters when slab or hidden leaks cause structural moisture.
Minimal disruption
Targeted opening beats demolishing entire walls on a guess. Detection technology narrows the search first.
Whole-home pressure tests
When the meter spins with everything off, we isolate branches until the leak reveals itself.
Customer reviews
Google Reviews
269 reviews Leak Detection & Repair services reviews near San Mateo
Google review
We had two leaky sinks in our house and called ASAP to fix the problem. Kong arrived and quickly assessed the situation. After discussion with both Kong and Donald, we concluded that the repair for the basement sink would not be necessary. Kong fixed the kitchen sink in a timely and professional manner. I would highly recommend ASAP for your plumbing needs. They provide fast, professional service at very reasonable rates. I also like how they provide a one year service warranty.
Karen H
Jan 12, 2025
Google review
Quick and responsible service. Don checked and repaired our leaky sink and water faucet adapter the same day that I called for the service. The work was professionally performed with proper cleanup afterward. I also like the fact that he wore shoe covers inside the house without the need for me to ask him to do so. Great work!
Jonathan
Dec 22, 2023
Google review
Don has done work on our home two times; fixing leaks in two bathrooms in our home. He quickly assessed the situation, provided details and options for addressing the leaks. He repaired the leaks quickly due to having the parts available in his truck (no need to run to get parts). We also just like Don - he's friendly, professional and shoots straight. Thanks, Don!
Aaron Dence
Jun 25, 2023
Google review
Don was able to come out next day to fix a leak. He was super quick to diagnose the issue, recommend a repair, and follow through with it right away. Pricing is a great value, and we’ll definitely use his business again!
Joyce Khoury
Jun 12, 2023
Google review
Don came over to fix a leak under our sink within 3 hours of reaching out to him. He was able to make a repair on our disposal rather than replacing the whole thing to keep the costs down. He was very friendly and helpful. Would be happy to use his services again in the future!
Jason Jasinski
Mar 16, 2023
Google review
I’ve used Drain Dr Don a few times for various plumbing needs: clearing blockages, repairing leaks. They are very responsive, no BS, professional, properly priced. I highly recommend their services when you have a plumbing emergency.
Bruce Johnson
Feb 18, 2023
Google review
Call Don! We had a leaking pipe underneath our kitchen sink and had no idea where the leak was. Don diagnosed the issue and had all the materials ready to go. Very pleasant experience and would definitely call him again!
John Ruan
Jan 18, 2023
Pinpointing hidden water leaks in San Mateo
A spinning water meter with everything turned off, warm spots on the floor, or mold without an obvious drip means water is escaping somewhere hidden. ASAP Plumbing Pros locates slab leaks, wall leaks, and supply line failures in San Mateo — then repairs them with as little disruption as we can manage.
Detection without guesswork demolition
Acoustic listening, pressure testing, and moisture mapping narrow the search before we open concrete or drywall. You approve repair scope after we show evidence. Read about methods on our leak detection & repair page.
Insurance and documentation
We note findings clearly for adjusters when structural moisture is involved. You get invoices and descriptions that match what we found.
Fix the source, not the symptom
Patching drywall without repairing the pipe invites mold return. Detection and repair stay on the same team so the problem actually stops.
Ready to schedule?
Use the contact form or call (415) 728-6391 for leak detection in San Mateo. Mention recent bill spikes or floor warmth so we bring the right equipment.
Good to know
What San Mateo Homeowners Ask About Leak Detection & Repair
How quickly can you help with leak detection in San Mateo?
Active leaks get urgent scheduling to limit water damage.
Do you find slab leaks in San Mateo?
Yes ? acoustic and pressure methods locate many slab leaks before targeted repair.
Why is my water bill suddenly high?
Hidden leaks, running toilets, and irrigation issues are common; we isolate the cause.
Do you repair after detection?
Yes ? detection and repair in one engagement when you approve the quote.
Will you need to tear up my floor?
We minimize demolition by locating precisely first.
Can leaks hide behind walls?
Yes. Moisture patterns and listening equipment narrow the search.
What does leak detection cost?
Based on property size and methods used ? quoted before invasive work.
What areas near San Mateo do you serve?
We serve San Francisco, Daly City, San Mateo, South San Francisco, San Bruno, Millbrae, and communities throughout San Mateo County. Call (415) 728-6391 to confirm service for your address.
Other Leak Detection & Repair Areas We Serve
Ready when you are
Plumbing emergency? We're on the way.
Call (415) 728-6391 or request service online — 24/7, every day of the year.