Answers to questions regarding UL certification of products to NSF Standards, regulatory acceptance of the UL marks, and other certification-related information.

Can UL certify products to NSF standards?

YES. UL is accredited by the American National Standards Institute (ANSI) to certify products to the NSF standards for food equipment, drinking water chemicals and products, and swimming pool equipment. A complete listing of our ANSI accreditation can be found on the ANSI website.

Do code authorities and regulatory authorities accept UL certifications?

YES. The UL Certification Marks for food equipment and for drinking water products and chemicals are accepted nationwide, and in every province in Canada.

Where can I locate UL EPH certifications?

All UL certifications are included in the Online Certifications Directory. A variety of useful search functions are provided for your convenience.

How do I determine the standards used by UL to certify products?

The applicable standard(s) for any certified product can be determined by viewing the Guide Information provided for each category of products. This information can be obtained by using the Online Certifications Directory.

A UL certified product was modified in the field. Does this void the certification?

An authorized use of the UL Mark is the manufacturer’s declaration that the product was manufactured in accordance with all applicable requirements, and was in compliance with those requirements when it was shipped from the factory. When a UL certified product is modified, retrofitted or altered in any way after it leaves the factory, it is not possible for UL to confirm that the product continues to meet the applicable certification safety requirements unless the field modifications are specifically investigated by UL. It is the responsibility of the Authority Having Jurisdiction (AHJ) to assess the acceptability of the modifications or to determine if the modifications are significant enough to require one of UL’s Field Engineering Services staff to evaluate the modified product. UL can assist the AHJ in making this determination. For information on UL field evaluations click here.