By David Parks · eXp Realty · The Apollo Group · 2 min read
A plumbing inspection checks supply lines, drains, fixtures, and water pressure. Pipe material matters because some older types corrode or fail more often than others.
Supply lines bring clean water into the house, and drain lines carry wastewater out. Inspectors test fixtures, look for leaks, and check shutoff valves and the main water line.
| Key point | What it means |
|---|---|
| Copper | Durable and common, though it can develop pinholes in certain water conditions. |
| Galvanized steel | Found in older homes; corrodes inside and can cause low pressure. |
| Polybutylene (gray plastic) | Used from the late 1970s to mid-1990s and associated with failures. |
| PEX | Flexible plastic widely used in newer construction and repairs. |
Low pressure at several fixtures, discolored water, active drips under sinks, stains on ceilings below bathrooms, and slow drains. Check the main shutoff location. Some very old homes may still have a lead service line, and local utilities often have information or programs about replacing them.
If an inspector flags old supply lines or visible leaks, ask a plumber for an estimate. Repiping can be expensive, but many homes with older materials still function well, so get facts before deciding.
This article is general information, not legal, tax, financial or inspection advice. Every home and situation is different, so confirm details with a licensed inspector, lender, attorney or tax professional.
David is a Greater Denver real estate advisor with eXp Realty and The Apollo Group (Colorado broker license FA100103211). He has closed more than $55 million in volume, earned eXp Icon status in 2025, and holds a 5.0 rating on Zillow from 27 verified reviews.
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