Is NSF Assurance Enough?

An NSF seal alone doesn’t verify the degree to which contaminants are reduced. Two products with the same NSF verifications could have vastly different filtration outcomes.

For further quality assurance you may want to look for the WQA—Water Quality Association —Gold Seal Product Certification Program. Their certification verifies safe construction materials, and that packaging claims are backed up by data.

Another third party certification often seen is IAPMO’s Water Systems Certification Program. Other assurity can come from independent lab test results sometimes audited by companies themselves.

Unfortunately, the independent Consumer Reports group, as of yet, do not test refrigerator water filters. You can, however, do your own inexpensive home water test, or you can evaluate ad hoc tests done people who have purchased the same product.