Watpure WTPAs
A NSF-certified under-sink filter that is certified to reduce 14 contaminants, including lead and PFAS.
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You want strong contaminant reduction at the kitchen tap without a countertop unit, and are comfortable with a simple under-cabinet install.
Certified to reduce Arsenic, Lead, PFAS — the contaminants that matter most for health.
Like most carbon filters, it does not remove fluoride — only reverse osmosis does that.
What is under-sink filter? A carbon-based cartridge (or set of stages) plumbed under your kitchen sink that filters the cold drinking-water line. Compare all filter types →
What it costs to own
| Upfront price | Check on Amazon → |
| Replacement filter (AsCB-WTP) | Find replacement → |
| Estimated yearly cost (filters, ~1.5×/yr) | — |
| True cost per gallon | — |
Cost per gallon and yearly cost are our estimates from the rated capacity and current prices. The filter only works if you replace it on schedule.
What it's certified to remove
Certification is per-contaminant: the Watpure WTPAs is credited only for the contaminants listed here, verified by NSF. It does not imply removal of anything not listed.
✓ Verify this certification on the official NSF listing →
Full specifications
| Certified by | NSF |
| NSF/ANSI standards | 42 — reduces taste, odor, and chlorine (aesthetic standard) · 401 — reduces emerging contaminants such as pharmaceuticals and pesticides · 53 — certified for health contaminants such as lead, VOCs, and cysts |
| Filter type | Under-sink filter |
| Rated capacity | 600 gallons |
| Flow rate | 1 gpm |
| Replacement element | AsCB-WTP |
| Installation | Mounts under the sink; connects to the cold line. Basic DIY. |
Frequently asked
Is the Watpure WTPAs NSF certified?
Yes — the Watpure WTPAs is listed in the NSF certified-product database under NSF/ANSI standards 42, 401, 53. That means an independent body verified its claims (not just "tested to" a standard).
Does the Watpure WTPAs remove arsenic?
Yes. It is certified to reduce Arsenic, Lead, PFAS, PFOA, PFOS, plus 9 other contaminants. Certification is per-contaminant, so it is only credited for what is on its listed claim set.
What does the Watpure WTPAs remove?
It is certified to reduce 14 contaminants: Arsenic, Asbestos, Chlorine / chloramine, Cryptosporidium, Giardia, Lead, Mercury, Microcystin, PFAS, PFOA, and more.
How often do you replace the under-sink filter?
A under-sink filter like this is typically replaced about 2 time a year (replacement element AsCB-WTP). Replace on schedule — a spent cartridge stops reducing contaminants.
Compare similar under-sink filters
Source: NSF public certification listing. Specs and certified claims are from the official listing; cost figures are our estimates. Some links are affiliate links — see our disclosure.