US certification for products related to public health, food safety, and water quality.
In plain language
NSF means the product has been independently tested and certified for safety in food, water, or health applications. NSF-certified water filters actually remove what they claim to remove. NSF-certified food equipment is safe for food contact.
What this marking confirms
Legal compliance
Often required by US state regulations for water treatment and food equipment.
Quality
NSF certification indicates the product meets specific performance and safety standards.
Safety
Strong safety assurance for food and water contact applications.
Is this marking mandatory?
ConditionalOften required by US state regulations for water treatment and food equipment.
How to obtain this marking
- 1Apply to NSF
- 2Product testing at NSF laboratory
- 3Facility audit
- 4NSF certification issued
- 5Annual surveillance
How to verify
Verify NSF certification at nsf.org/certified-products-systems.
Open verification portalCommon errors and misuse
Claiming NSF certification without valid certificate
Using NSF mark on uncertified products
Related standards
nsf-ansi-61nsf-ansi-42