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Most plumbing problems don’t announce themselves in advance. A water heater that’s quietly filling with sediment, a supply line under the sink that’s slowly degrading, a drain that’s 80 percent blocked but still technically draining — these issues build up over months and years until the day they turn into an emergency call and a water-damaged floor. The good news is that most of them are entirely preventable. At IRBIS Air, Plumbing & Electrical, our licensed plumbers serve homeowners across San Jose and the Bay Area, and we see the same preventable failures recurring. This checklist is based on what our team looks for during a professional plumbing inspection — and what every homeowner should know to keep their plumbing in good shape year-round.
The Two Most Common Preventable Plumbing Problems We See
Before getting into the full checklist, it’s worth knowing which two issues show up most frequently on IRBIS service calls — and both are almost always preventable with routine maintenance.
The first is a water heater failure caused by sediment buildup. Most homeowners never flush their water heater, and over time, mineral deposits — especially common with the Bay Area’s hard water supply — accumulate at the bottom of the tank. This reduces heating efficiency, increases energy costs, and eventually leads to leaks or complete tank failure. Flushing the water heater once a year removes that sediment and can add years to the unit’s lifespan.
The second is failing angle stop valves and supply lines. The small shut-off valves under your sinks and behind your toilets — called angle stops — are designed to let you isolate a fixture in an emergency. But when they go years without being operated, the internal components seize up, and they stop working when you need them most. Equally important are the flexible supply lines connecting those valves to your fixtures. These braided or plastic lines deteriorate over time and can burst suddenly, dumping gallons of water into your cabinet, wall, or floor. During a professional inspection, our plumbers exercise each valve and check every supply line for signs of wear, bulging, or corrosion — small things that are cheap to fix and catastrophic to ignore.
The IRBIS Plumbing Maintenance Checklist
Here is what a thorough annual plumbing inspection covers. Some of these items homeowners can check themselves; others benefit from a licensed plumber’s eye and tools.
- Flush the tank to remove sediment buildup (annually for most Bay Area homes)
- Inspect the anode rod — the sacrificial rod that prevents tank corrosion — and replace if needed
- Check the temperature and pressure (T&P) relief valve to confirm it operates correctly
- Inspect the area around the base of the tank for moisture, rust staining, or early signs of a slow leak
- For tankless water heaters: descale the heat exchanger annually
Shut-Off Valves and Supply Lines
- Exercise all angle stop valves under sinks, behind toilets, and at appliances to confirm they open and close freely
- Inspect all flexible supply lines for bulging, cracking, corrosion at fittings, or signs of moisture
- Locate and test the main water shut-off valve for the home — every adult in the household should know where it is and confirm it works
- Check all drains for slow drainage, which indicates partial blockage
- Look for gurgling sounds or odors from drains, which can signal a venting issue or deeper blockage in the sewer line
- For homes with older cast iron or clay sewer lines, consider a camera inspection every few years to check for root intrusion, offset joints, or buildup
- Note: during Bay Area rainy seasons, existing partial drain blockages often become full backups as rainwater enters through roof vents — clearing drains before winter is good practice
- Inspect all visible pipes under sinks, in the garage, and in the utility room for corrosion, mineral deposits, or active drips
- Check pipe insulation on exposed lines in unconditioned spaces
- Look for water staining on walls, ceilings, or cabinet interiors — often the first visible sign of a slow leak inside the wall
- Check under-sink plumbing for any active drips at P-trap connections
- Run the disposal and listen for unusual grinding or humming
- Check the drain connection and the sink flange for leaks
- Confirm the reset button is accessible and the unit resets properly
Plumbing Maintenance and Bay Area Seasons
Unlike colder parts of the country, Bay Area homeowners don’t have to worry about pipes freezing — but that doesn’t mean seasonal plumbing maintenance doesn’t matter. The most consistent pattern our team sees is drain problems that surface during the rainy season. Partially blocked drain lines that manage just fine during the dry months get overwhelmed when heavy rain enters through roof vents and adds volume to the system. Homeowners suddenly discover a backup they didn’t know was coming. If you’ve noticed any slow drains during the year, getting them properly cleared before the first significant rains of the season is one of the most practical maintenance steps you can take. We also recommend that homeowners take the opportunity at the start of each season to walk through the basic valve and supply line checks described above — particularly in older homes where some of this hardware may not have been touched in years.
When to Call a Professional vs. Handle It Yourself
Some items on this checklist — checking for dripping faucets, running a garbage disposal, or spotting a slow drain — are things any homeowner can do on their own. Others genuinely require a licensed plumber. Testing and replacing a T&P relief valve, performing a water heater flush correctly, operating a corroded angle stop without cracking the fitting, or scoping a sewer line all carry real risk of making things worse if done incorrectly. A licensed plumber also carries the liability insurance and California contractor’s license required to work on plumbing systems legally, which matters for your homeowner’s insurance coverage and for documentation when you sell. IRBIS offers professional plumbing inspections and maintenance services throughout San Jose and the Bay Area. Our technicians go through the complete checklist above, flag anything that needs attention, and can address repairs the same day in most cases.
Conclusion
Staying ahead of plumbing problems doesn’t require much time — but it does require knowing what to look for and making it a habit. The items on this checklist are what IRBIS plumbers check in San Jose homes every day, and the ones we find most often neglected are also the ones most likely to cause serious damage when they finally fail. If it’s been more than a year since your plumbing has been professionally inspected, or if any of the warning signs above sound familiar, we’re ready to help. Call IRBIS at +1 (669) 312-3643 or contact us online at irbishvac.com/contact to schedule a plumbing inspection or maintenance visit.
During a repair visit, our technicians will inspect your A/C system, diagnose the problem, and provide you with repair options. Once you choose an option, we'll proceed with the necessary repairs. Afterward, we'll test the system to ensure it's working correctly and provide you with a detailed report.
