Pasadena sits about three and a half miles north of Alhambra, the largest city in our service area, with homes and commercial buildings of every size and age. That range is exactly why specialist detection matters: a leak under a home's slab and a leak in a commercial building's supply line need the same thing, a precise location found without damaging the property. Alhambra Leak Pros is a leak detection specialist serving Pasadena homes and businesses with non-invasive diagnostics.
We bring acoustic listening, thermal imaging, tracer gas, and pressure testing to Pasadena properties of all kinds. Every visit ends the same way: the leak's exact position marked, the findings documented, and your contractor or facility team able to plan a repair that opens one certain spot instead of searching through the building.
Service ZIP codes: We serve homes and businesses across Pasadena, CA, including ZIP codes 91101, 91103, 91104, 91105, 91106, and 91107.
Last updated: October 13, 2026
About Leak Detection in Pasadena
Pasadena is a city in Los Angeles County, approximately three and a half miles north of Alhambra. As the largest city we serve, it generates the widest range of calls: slab leaks in family homes, wall and ceiling leaks in multi-story buildings, underground main-line leaks, pool and spa leaks, and commercial water-loss investigations. We schedule Pasadena visits daily, with full 24/7 availability for emergencies.
Because Pasadena properties vary so widely, we tailor every visit to the building in front of us. A single-family home with a suspected slab leak gets acoustic listening and thermal scanning; a multi-story building with a ceiling stain gets moisture mapping across floors to trace the water's path; a commercial property with a soaring bill gets a systematic water-loss survey across its systems. Pool and spa calls get pressure testing of each line plus dye testing at suspected defects, and sewer or drain concerns get camera inspection with locating and depth-marking. And when a home purchase is on the line, our camera inspections give buyers a clear picture of the drain system's condition before escrow closes. Whatever the property, the deliverable is the same: a precisely marked leak location and documentation your contractor, manager, or insurer can use.
Pasadena owners call us for all of these:
Slab-leak symptoms: warm floors, high bills, water sounds
Ceiling and wall stains with no obvious source
Pool or spa water loss beyond normal evaporation
Underground line leaks: soggy ground, low pressure
Sewer concerns before a home purchase
Commercial buildings with unexplained water consumption
Musty odors or visible mold with no visible water source
Warm or cool spots on commercial flooring
Water stains in parking structures or basements
Irrigation systems losing pressure zone by zone
HOA master meters showing unexplained usage
Landscaped grounds with irrigation leaks
Mechanical rooms showing unexplained moisture
Services Available in Pasadena
Every Alhambra Leak Pros service is available here, including:
How pinpointing changes the job: 5 illustrative examples
The examples below are illustrative. They show how pinpointing typically changes a job. They are not reports of specific customer jobs, and they name no customer, address, date, or price.
1. A warm spot on the floor
Illustration: Slab cross-section with one marked spot
Before: A homeowner notices one warm patch on the floor and a bill that keeps climbing, but no visible water. Without instruments, the only way to find the leak would be to open large areas of flooring and guess.
Method: The technician checks the meter, isolates the hot-water line, then combines thermal imaging with acoustic listening to follow the heat and sound to one point.
After: The leak is marked on the floor at one spot. Any repair opens that spot only, and the rest of the floor stays intact.
2. A stain on the ceiling
Illustration: Ceiling stain traced back to its source line
Before: A brown stain spreads across a ceiling, but the pipe above it may run several feet away. Opening the ceiling at the stain alone often misses the source and means opening more drywall later.
Method: The technician maps the damp area with thermal imaging and moisture readings, then checks pressure and nearby lines to trace the water back to its source.
After: The source line is identified and marked. Any opening is made where the leak actually is, not where the stain happens to show.
3. A meter that moves with everything off
Illustration: Meter test with every tap off
Before: Every tap is off, yet the water meter still moves. That proves water is leaving the system somewhere, but it says nothing about where. Digging or opening walls at this point would be pure guesswork.
Method: The technician runs a timed meter test, then isolates lines one by one with pressure checks to narrow the loss to a single line.
After: The search area shrinks from the whole property to one line. Pinpointing then focuses on that line only, before anything is opened.
4. A pool that keeps losing water
Illustration: Bucket test comparing pool and bucket levels
Before: A pool loses water faster than normal, but some loss is normal evaporation. Draining the pool or digging up pipes without a test would waste water and money.
Method: The technician runs a bucket test to separate evaporation from a real leak, then pressure tests each line on its own to find which line loses pressure.
After: If the pool is only evaporating, no repair is needed. If one line fails, the search narrows to that line instead of the whole pool system.
5. Slow drains and a sewer odor
Illustration: Camera inspection showing a defect inside the line
Before: Drains run slow and a sewer odor lingers, but the blockage or break could sit anywhere along the line. Digging to find it would disturb the yard and still might miss the defect.
Method: The technician sends a camera through an existing access point and watches the inside of the line on video, marking where roots, cracks, or offsets appear.
After: The defect is seen on video and its position is known. Any digging happens at that one place, after the cause is already clear.
Frequently Asked Questions
Do you cover all of Pasadena?
Yes. We serve homes and businesses throughout Pasadena, as well as South Pasadena, San Marino, and the surrounding San Gabriel Valley. Most visits are scheduled within our daily Pasadena routing.
Do you handle commercial properties, not just homes?
Yes. Offices, retail spaces, restaurants, apartment buildings, and HOAs, commercial water-loss surveys are one of our core services. We document findings for facility managers and owners.
Will detection disrupt my home or business?
No. Everything we do during detection is non-invasive, no cutting, no digging, no demolition. For businesses, that means we can typically work without shutting down your operation.
Do you offer emergency service in Pasadena?
Yes, 24 hours a day, 7 days a week. Call +1 626-898-6221 any time. We will talk you through immediate steps and arrange the earliest available visit, without promising arrival times we can't keep.
Suspect a Hidden Leak? Don't Wait for the Damage.
Every day a hidden leak runs, the water bill climbs and the damage spreads. Call now, we answer 24 hours a day.
