How long does home plumbing last? Using InterNACHI’s home life-expectancy chart: a conventional tank water heater lasts about 6–12 years; supply pipes last decades (copper ~70 years, PEX ~40, plastic/PVC ~75); faucets 15–20 years; a garbage disposal ~12 years; a water softener ~20; and a sump pump only ~7. The porcelain toilet itself can last 100+ years — but its tank guts (flapper and fill valve) wear out about every 5.
What shortens all of it fastest? Hard water and skipped maintenance.
Homeowners ask me this all the time — usually right after something floods or quits: how long was that supposed to last, anyway? Below is the chart I go by, with the year figures pulled from InterNACHI’s Standard Estimated Life Expectancy Chart (the same reference home inspectors use), plus my own notes on what actually shortens each one and how to tell it’s near the end. These are typical lifespans for gear that’s installed right and maintained — abuse or hard water moves the numbers the wrong way fast.
Home plumbing lifespan chart
| Component | Typical lifespan | What shortens it / what to watch |
|---|---|---|
| Water heater — tank (conventional) | 6–12 years | Sediment and hard water are the killers — flush it yearly. Past ~10 years, budget for a replacement and watch for rusty water or a damp base. |
| Water heater — tankless | 10 years* | *InterNACHI’s figure is conservative — most manufacturers rate tankless units near 20 years, but only if they’re descaled. On hard water with no maintenance, they slide back toward a tank’s lifespan. |
| Supply pipe — copper | 70 years | Very durable. Pinhole leaks show up mainly in aggressive or acidic water. |
| Supply pipe — PEX | 40 years | Low-drama indoors. Keep it out of direct sunlight — UV degrades PEX. |
| Supply pipe — plastic (PVC/CPVC) | 75 years | Long-lived. Older CPVC can get brittle with age and heat. |
| Waste pipe — ABS/PVC | 50–80 years | The modern standard; rarely the problem. |
| Waste pipe — cast iron | 50–60 years (below ground) | Old-house material — corrodes and scales from the inside, which is often the real answer to “why does my old drain keep clogging?” |
| Faucets & spray hose | 15–20 years | The cartridge or washers fail long before the body — usually a cheap rebuild, not a whole new faucet. |
| Toilet — the porcelain fixture | 100+ years | The bowl basically never wears out. |
| Toilet — tank components (flapper, fill valve) | 5 years | These do wear out. A running toilet is almost always a cheap flapper or fill valve, not a new toilet. |
| Garbage disposal | 12 years | Jams and hums are usually fixable; a leak from the body itself means it’s time to replace the unit. |
| Water softener | 20 years | The resin wears out over time — a softener that has quietly stopped softening is often near the end. |
| Sump pump | 7 years | The shortest-lived thing on this list. Test it every spring — a dead sump pump is how a basement floods. |
| Well pump | 15 years | Short-cycling (rapid on/off) burns them out early — usually a bad pressure tank or waterlogged bladder. |
Year figures: InterNACHI Standard Estimated Life Expectancy Chart. The “what shortens it” notes are from the field. Lifespans are typical estimates, not guarantees — installation quality, water chemistry, and maintenance all move them.
One material that isn’t on the chart: galvanized steel
InterNACHI’s chart doesn’t list galvanized steel supply pipe, but in older homes it’s the material I flag most. It corrodes from the inside out, slowly chokes your water pressure, and is usually the reason a house needs a repipe. If your home is pre-1970s and has never been repiped, assume the galvanized is on borrowed time and have it looked at — don’t wait for the leak.
What shortens almost everything: hard water
Notice how many rows above blame scale and minerals. That’s not a coincidence — hard water is the single biggest life-shortener for water heaters, faucets, and anything with a valve or a heating element. If your water is on the hard side, softening it pays for itself in gear that lasts closer to the top of these ranges. I put the actual dollar math in our true cost of hard water guide.
Frequently asked questions
How long does a water heater last?
A conventional tank heater lasts about 6–12 years (InterNACHI). A tankless unit can go longer — near 20 years — but only if it’s descaled regularly, especially on hard water. Once a tank heater passes 10 years, watch for rusty water, popping/rumbling, or moisture at the base.
How long do pipes last in a house?
Copper supply lines last around 70 years, PEX around 40, and plastic/PVC around 75. Drain lines: modern ABS/PVC 50–80 years, cast iron 50–60. The early failure is galvanized steel in older homes, which corrodes from the inside.
Which plumbing part fails first?
The shortest-lived items are the sump pump (about 7 years) and toilet tank components like the flapper and fill valve (about 5 years). Both are cheap to stay ahead of — and expensive to ignore.
How long does a garbage disposal last?
About 12 years (InterNACHI). Jams and humming are usually repairable, but a leak coming from the disposal body itself means it’s time to replace the unit.
Does hard water shorten plumbing life?
Yes. Scale from hard water builds inside water heaters, faucets, and appliances, making them work harder and fail sooner. Softening the water is what lets that gear reach the top of the ranges in the chart above.
Sources
- InterNACHI, “Standard Estimated Life Expectancy Chart for Homes” — nachi.org (all year figures)
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