As a certified home inspector, one of the most critical systems evaluated is plumbing. Most of it is hidden behind walls, under floors, or buried beneath the foundation, so buyers don’t often see the full picture. Plumbing issues can range from minor annoyances to expensive, deal-breaking problems. Here’s what I look for during a home inspection and what plumbing red flags you should be aware of.

🚿 1. Visible Leaks & Water Stains

The first thing I check is for active leaks under sinks, around toilets, behind washing machines, and in basements or crawlspaces. A big clue is often water staining on ceilings, floors, or walls. These are all signs of past or ongoing moisture issues. Even small leaks can cause serious mold or rot over time.

Inspector tip: A freshly painted ceiling or wall might be hiding a past leak. Using moisture meters or infrared tools helps see what the eye cannot.

🚽 2. Drainage Issues

Slow drains or standing water in tubs, sinks, or showers can signal blockages or poor slope in drainpipes. I check all fixtures to see how quickly water drains and if there are any gurgling sounds, which can indicate venting issues.

Why it matters: Poor drainage can lead to backflow, clogs, and even sewer line failures.

🧯 3. Water Heater Problems

Water heaters are one of the most expensive plumbing-related appliances in a home. I inspect:

• The age and condition of the unit
• Signs of corrosion or leaking
• Proper installation of temperature & pressure relief valves
• Whether there’s adequate clearance around the unit

If the tank is over 10-12 years old, I note it in my report, even if it’s still working. It’s approaching the end of its expected life.

🚰 4. Polybutylene or Galvanized Pipes

Yes, I’m always checking the type of piping used throughout the home. Two major red flags:

• Polybutylene pipes (common in homes from the late ’70s to mid-’90s) are prone to failure.
• Galvanized steel pipes, while once common, corrode internally and reduce water pressure over time.

Both are costly to replace and could impact insurability.

💧 5. Low Water Pressure

I test every faucet and shower to evaluate water pressure. Low pressure may be caused by:

• Corroded pipes
• Clogged aerators
• Municipal supply issues
• Leaks in the system

While some issues are minor, low pressure in multiple areas may point to larger systemic problems.

🔍 6. Improper Repairs or DIY Plumbing

One of the biggest red flags is unpermitted or amateur plumbing work. Mismatched materials, incorrect slope in drain lines, unsupported pipes, or lack of proper traps/vents are things that should be caught quickly. These issues can lead to leaks, sewer gases, or code violations. Just because it “looks” fixed doesn’t mean it’s done right.

🚿 7. Sump Pumps and Sewage Ejectors

Not often seen in North Carolina, but in homes with basements, sump pumps and sewage ejector systems should be tested for:

• Proper operation
• Backup systems
• Signs of past flooding or water intrusion

A failed sump pump can result in serious water damage, especially during storms or heavy rainfall.

Final Thoughts: Why Plumbing Red Flags Matter

Plumbing is a silent threat. Hidden issues can stay dormant for years before they cause visible damage. As a home inspector, my goal is to uncover these red flags before they become financial burdens.

If you’re buying a home, always read the plumbing section of your inspection report carefully. If you’re selling, consider a pre-listing inspection to catch and fix plumbing issues ahead of time.

Need help deciphering your inspection report or planning repairs? Feel free to reach out. I’m here to help you make informed decisions and protect your investment.