Decision tool

NSF/ANSI claim checker

A standard number is not a contaminant promise. Pick the problem, see which listing to ask for, then take the checklist into a consultation.

What is the buyer trying to address?

Typical standard

NSF/ANSI 53 or 58

Lead reduction is a specific claim under 53 (filters) or 58 (reverse osmosis). The standard number without the lead claim is not enough.

Ask for: The certifier listing URL showing lead reduction for the exact model and flow/capacity.

Consultation checklist (0/6)

Exact model and replacement cartridge/membrane numbers are written on the quote
I can open the certifier listing (NSF, WQA, IAPMO or equivalent) for that model
The contaminant I care about is named on the listing — not only a standard number
Rated flow and capacity match the household (or the drinking tap, for point-of-use)
Replacement schedule and parts cost are in writing
For health-related contaminants, the quote includes paired accredited samples after commissioning

This tool helps you ask better questions. It is not a certification, product listing, or medical advice. WaterFilterHelp matches one vetted installer — we do not sell equipment.

Take this checklist into a local quote

One exclusive match — not an auction.

Full reference: NSF/ANSI water-filter certification reference.