How long does a water filtration system last?
Updated August 2026
The housing of a whole-house water filtration system lasts 10–15 years, but that headline number hides the part that needs your attention: the cartridges inside, which get changed every 3 to 12 months depending on how dirty your water is. Point-of-use setups follow the same split. An under-sink reverse-osmosis (RO) membrane runs 2–5 years while its pre-filters go every 6 to 12 months, and a UV disinfection bulb is replaced every 12 months. Installed cost spans $150–2,000 across those types, so the real running cost is cartridges, not the box on the wall.
Lifespan by type and situation
| Type or situation | Typical lifespan | Why |
|---|---|---|
| Whole-house filter housing | 10–15 years | The head or tank; cartridges are the consumable inside |
| Sediment / carbon cartridge | 3–12 months | Changed on flow and how dirty the water runs |
| Reverse-osmosis (RO) membrane | 2–5 years | Under-sink RO; pre-filters swap every 6–12 months |
| UV disinfection bulb | 12 months | Replaced yearly even while it still glows |
| Backwashing carbon tank | 5–10 years | The carbon media inside is spent and re-bedded |
| Ignored, cartridges never changed | Pressure falls fast | A clogged filter chokes the whole house and strains the pump |
Signs yours is near the end
- A steady drop in water pressure across the whole house, the classic sign of a clogged cartridge
- Water that tastes, smells, or looks worse than it did right after the last change
- A sediment housing packed brown or orange when you open it up
- An RO system that trickles rather than filling its tank in a reasonable time
- A UV alarm, or a bulb pushed past its 12-month mark
- Cracks, weeping, or a mineral crust at the housing threads and fittings
How to add years
The system lives or dies on filter discipline, nothing else. Changing the whole-house cartridge on schedule, every 3 to 12 months for your sediment load, holds pressure up and keeps a clogged filter from straining the housing and any pump behind it. On an RO unit, stay ahead of the membrane and pre-filters so the pricey membrane, at $50–150, is not shredded by grit a cheap pre-filter should have caught. If you run UV, the bulb gets replaced yearly whether or not it still lights, because its germicidal output fades long before it goes dark. Run the filtration maintenance routine as a fifteen-minute quarterly habit and the housing reaches the top of its range.
What it costs to replace: plan on $150–2,000 installed depending on type (under-sink RO to whole-house). Replacing on your own schedule, before it fails, is almost always cheaper than the emergency version. The home maintenance cost calculator helps you set the money aside before it comes due.
OnOtto tracks your filter cartridge changes age and service history, and warns you before end of life instead of after the flood.
Track your home's systems, free for 30 daysFrequently asked questions
How often do I actually change the filter?
It depends on the cartridge and your water. A standard whole-house sediment or carbon cartridge lasts 3 to 6 months on typical municipal water, up to 12 months if the water is clean and use is light, and as little as 6 to 8 weeks on dirty well water. RO pre-filters go every 6 to 12 months, the RO membrane every 2 to 5 years, and a UV bulb every 12 months. Watch pressure and taste; both warn you before the calendar does.
Is a whole-house water filter worth it?
For most homes on decent municipal water, a filter at the kitchen sink ($150–400) covers drinking and cooking for far less than a whole-house unit ($800–2,000 installed). Whole-house earns its keep when the problem is everywhere: sediment staining fixtures, chlorine you smell in every shower, or well water that needs treating before it touches anything. Price the cartridges too, because a cheap system that burns $60 cartridges four times a year is not cheap across a decade.
What happens if I never change the filter?
Pressure falls first, since a clogged cartridge chokes flow to the whole house. Left long enough, the filter can channel or collapse, letting unfiltered water and trapped gunk push straight through, so you are paying to filter nothing. A saturated carbon cartridge can even start shedding what it captured back into the water. None of this wrecks the housing overnight, but a neglected filter cancels the reason you installed the system and strains any pump or RO pump downstream.
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