Buying guide
Faucet Filter Replacement Cost: What It Really Costs to Own
A faucet filter's purchase price is the small number — replacement cartridges cost more every year. Here's the real annual math for each pick, why a cheap filter can cost the most to feed, and how to cut the ongoing cost without losing certified protection.
Compare filters by true cost →The sticker price is the small number
A faucet filter costs $25–40 up front. The cartridges cost more than that every year. As with most filtered-water products, the real cost of ownership is the recurring replacement — and it's what should drive the buying decision, not the one-time price.
The annual math
Faucet filter cartridges typically need replacing every 2–4 months, or about 3–4 times per year for an average household. Here's the rough yearly picture:
| Filter | Cartridge life | Cartridge price | Approx. annual cost |
|---|---|---|---|
| Culligan FM-25 | ~2 months | $15–20 | $90–120 |
| PUR PLUS | ~3 months (100 gal) | $15–20 | $60–80 |
| Brita Faucet | ~4 months (100 gal) | $18–22 | $54–66 |
| Waterdrop | Long-life cartridge | $20–28 | $40–56 |
| Aquasana Countertop | Much longer life | higher per unit | $50–70 |
Two takeaways:
- A cheap filter with short-life cartridges can cost more per year than a pricier one with long-life cartridges. The Culligan is the cheapest to buy but among the more expensive to feed; the Waterdrop flips that.
- Filter life claims assume average water. Hard water or heavy sediment shortens cartridge life — sometimes dramatically.
How to spend less without losing protection
- Buy cartridges in multi-packs — per-unit price drops noticeably.
- Use the filtered/unfiltered switch. Every glass of unfiltered water you draw for dishes or rinsing is filter life you didn't spend. This single habit meaningfully extends cartridge life.
- Don't stretch cartridges past their rating. A spent filter doesn't just taste worse — for certified reductions like lead (see the lead guide), an expired cartridge stops delivering the certified protection you bought it for. The replacement schedule is the protection.
- Match the filter to your water. If you only care about taste, don't pay for (and replace) a broad-spectrum cartridge.
The honest comparison to alternatives
A faucet filter's per-gallon cost sits between a pitcher (cheapest cartridges, most refilling) and an under-sink system (priciest hardware, lowest per-gallon cost over time). If your household drinks a lot of water, the under-sink Aquasana's long cartridge life can win on cost per gallon despite the higher entry price — the logic is the same one in the renters guide, just pointed at budget instead of installation.
Want the ongoing cost built into your recommendation? The faucet filter quiz asks about replacement-cost priority directly, and every pick on the hub notes its cartridge economics.
Still choosing?
- NSF 42 vs NSF 53: The Certification That Decides Your Filter
- Culligan FM-25 Review: Certified Lead Reduction on a Budget
Our faucet filter picks
Frequently asked
How long do faucet filter cartridges last?
Most need replacing every 2–4 months, or 3–4 times a year for an average household. Hard water or heavy sediment shortens that, and using the unfiltered switch for non-drinking water extends it.
How much do faucet filter replacements cost per year?
Often $40–120 per year depending on the model. Long-life cartridges (like Waterdrop's) sit at the low end; short-life cartridges (like the budget Culligan's) can cost more per year despite a cheaper filter.
Is it safe to use a cartridge past its rated life?
No — for certified reductions like lead, a spent cartridge stops delivering the certified protection. Replacing on schedule is part of the protection, not an optional upgrade.
How can I reduce replacement costs?
Buy cartridges in multi-packs, use the filtered/unfiltered switch so you only spend filter life on drinking water, and match the cartridge type to what you actually need to remove.