Query NSF's certified-product listings (drinking water treatment units, system components, plumbing products) to verify a manufacturer's NSF certification claim
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Identify the correct category sub-site under info.nsf.org/Certified/ for the product type (e.g., PwsComponents for drinking water system components, DWTU for drinking water treatment units, plumbing for plumbing products, Lead_content for lead-content evaluations).
Open that category's listing page and use the on-page search form to filter by company name, brand/trade designation, or model number, then submit.
Read the returned HTML results table for the exact model and the specific NSF/ANSI standard(s) and contaminant-reduction claim(s) it is certified against.
For a general cross-category browse of certified companies, use listings.nsf.org instead of a single category sub-site.
Re-check the page's own 'current as of [date]' notice before treating a listing as up to date.
Known gotchas
No REST/JSON API is published; access is only through HTML search forms that can change layout without notice, so any scripted pull is unofficial and fragile.
The same product can appear under multiple category sub-listings (e.g., a resin material vs. the assembled softener) — search the sub-listing that matches the actual claim being verified.
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