Is ZeroWater NSF certified?
Last reviewed July 2026.
Yes. ZeroWater filters are listed by IAPMO against NSF/ANSI standards including 53 — the health-effects standard that covers lead — so the lead claim is one you can actually verify in a public listing.
What the listing actually says
| Model | Standards | Lead (53) | Certified capacity | $ / certified gallon |
|---|---|---|---|---|
| 5-Stage Replacement Filter (2-pack) ZR-002 buy ↗ | 42 53 | ✓ | 15 gal | $1.233 |
ZR-002: System certified by IAPMO R&T to NSF/ANSI 42 (chlorine) and 53 (lead, hexavalent chromium, PFOA/PFOS, mercury). Not in the NSF listing database — IAPMO is a separate accredited certifier.
What those standard numbers mean
- NSF/ANSI 42 — aesthetic effects (chlorine, taste and odour). Not a health claim.
- NSF/ANSI 53 — health effects. This is the standard that covers lead.
Verify it yourself: every ZeroWater row above links the certifier's own listing. If a number here disagrees with the listing, the listing wins — tell us and we'll fix it.
See how ZeroWater ranks on cost per certified gallon against every filter we track →
We do not test filters — we index what accredited certifiers publish, with attribution, and make no health or treatment claims. A certification covers a specific model against a specific standard; it is not a general seal of quality. We are not affiliated with NSF International.
← Back to the full ranking