Diagnosed right.
Fixed once.
Camera inspection, leak detection, and pressure testing before a single wrench turns — so you pay for the repair your building actually needs. Serving San Antonio facilities and homes.
COMMERCIAL ACCOUNTS: maintenance programs for auto service centers, restaurants, retail & multi-location operators.
Plumbing that doesn't close your doors
A clogged floor drain or a failed backflow test can shut down a bay, a kitchen, or a whole location. We keep commercial facilities compliant and flowing — on a schedule, not in a panic.
Auto Service & Tire Centers
Floor drains, oil-water separators, compressed-air condensate lines, restrooms and wash bays — kept clear across every bay and every location.
Restaurants & Food Service
Grease line jetting, fixture repair, water heater service and backflow compliance that keeps the health inspector and the lunch rush both happy.
Retail & Property Management
One vendor, one invoice, one report across your portfolio. Tenant fixture calls, common-area lines, and annual compliance handled.
Warehouses & Offices
Restroom banks, break rooms, irrigation backflow and supply lines — quietly maintained before your team ever notices a problem.
Put your plumbing on a schedule
A standing maintenance agreement built around your facilities — so small issues get caught on our rounds instead of becoming your 2 a.m. emergency.
Request a Facility Assessment →- Scheduled inspections of drains, fixtures, water heaters & supply lines
- Annual backflow testing & certification filed for you
- Priority dispatch — program accounts jump the line
- Condition reports per location, in plain English
- One point of contact across all your sites
Texas requires annual backflow testing.
Commercial properties with backflow prevention assemblies must have them tested by a licensed tester every year — and lapsed certifications can mean fines or water service interruption. We test, repair, replace, and file the paperwork.
Every service starts with a diagnosis
It's in our name for a reason. We use camera inspection, acoustic leak detection, and pressure testing to find the actual problem — then quote the actual fix.
Leak Detection & Camera Inspection
Locate hidden leaks and line damage without exploratory demolition. Know exactly what's wrong — and what it costs — before work begins.
Backflow Testing, Repair & Replacement
Certified testing for all backflow prevention assemblies, with repairs, replacements, and annual filings handled end to end.
Drain Cleaning & Line Jetting
From slow residential drains to grease-heavy commercial lines and shop floor drains — cleared, jetted, and inspected on camera.
Repairs & Preventive Maintenance
Fast fixes for leaks, clogs, and failing fixtures, plus scheduled maintenance that extends system life and cuts water waste.
Pipe Installation & Repipes
New plumbing systems and replacement of aging, corroded lines — engineered for safe, efficient flow in homes and commercial buildings.
Fixtures & Water Heaters
Sinks, faucets, toilets, disposals, filtration, and water heater installs — done right the first time, sized for how you actually use them.
The same diagnostic care, at your kitchen sink
The crew that keeps San Antonio businesses running is the same crew that shows up at your door — licensed, background-checked, and committed to fixing it once.
No mystery invoices. We show you what we found, walk you through your options, and quote the work before it starts.
Request a Service Call →Most-called-for at home
- Water heater repair & replacement
- Hidden leak detection & repair
- Drain clearing & sewer camera inspection
- Toilet, faucet & fixture installs
- Whole-home repipes for aging lines
- 24/7 emergency response
Tell us what's going on
Fill this out and we'll call you back to schedule — usually same day. Prefer to talk now? (210) 988-8976. For emergencies, always call.
Sewer Drain Clearing Special
Slow or stopped drain cleared, flow restored.
Water Heater Inspection & Flush
Sediment flush plus a full safety & efficiency check.
Sewer Line Camera Inspection
See exactly what's in your line — recorded, explained, no guesswork. Our signature diagnostic.
Check the special you want on the form and we'll lock it in when we confirm your appointment.
What San Antonio says
I can't say enough good things. When I had a major plumbing emergency, they were at my doorstep within 30 minutes.Tracy R.EMERGENCY RESPONSE
I recently hired Plumbing Diagnostic & Repair to upgrade my outdated plumbing fixtures, and I couldn't be happier with the results.Rebecca GeorgeFIXTURE UPGRADE
They've handled all my plumbing needs for years, and they've never let me down. Their dedication to customer satisfaction is unbeatable.Jessica RodriguezLONG-TERM CLIENT
Frequently asked questions
What do I do in a plumbing emergency outside business hours?
Do you offer maintenance contracts for businesses with multiple locations?
What does "backflow certified" mean, and do I need testing?
Are your plumbers licensed and insured?
How often should I schedule plumbing maintenance?
Stop guessing. Start diagnosing.
Whether it's one kitchen sink or twelve locations of floor drains, the first step is the same: we look, we test, we tell you exactly what's going on.