Look for the NSF Mark

Around the world, NSF International represents technical excellence in public health and safety, and the NSF mark is a symbol of this expertise.

The trusted NSF mark can be found on millions of consumer, commercial and industrial products, including bottled water, dietary supplements, food equipment, home water treatment products, home appliances, plumbing and faucets, and even pool and spa components. This mark is your assurance that the product has been tested by one of the most respected independent certification companies in existence today — NSF International. We focus on ensuring public health, safety and environmental quality.

Examples of the NSF Mark

Almost all products that carry NSF certification bear an NSF mark. In some cases the mark appears on the product itself, while in others it might appear on the product packaging or in the literature that accompanies the product.

Options for indicating a product’s certification include the use of just the NSF mark (a circle containing the letters NSF), the letters NSF followed by a series of numbers or letters to indicate a product standard, or a foil sticker with the NSF mark and several numbers/letters that can be traced to a particular manufacturer. In most cases the manufacturer’s name or identifying mark is present on the product along with the product name or model designation.

Below are examples of how the NSF mark may appear on individual products:

Although voluntary, many manufacturers of NSF certified bottled water use the standard NSF certification mark — a circle containing the letters NSF — as a sign to consumers that their product has been independently tested and certified for quality.
Manufacturers of home water treatment systems frequently use the NSF independently certified mark and indicate the standard(s) to which their product has been certified.
Home plumbing fixtures can bear one of several different marks depending on the type of testing conducted on the product. In this example, “NSF-pw” means that this pipe was certified for potable water use.
Kitchen appliances and other home
products that are certified under the NSF Home Products Certification Program display a special mark on the packaging indicating the product has been certified for home use.
Dietary supplements that have been tested and certified for content under NSF/ANSI 173 display the traditional NSF mark along with a box under the mark to indicate the type of certification received.
In addition to meeting NSF/ANSI 173, products certified under the NSF Certified for Sport® program bear a unique mark to indicate the product has also been tested for banned substances.
Personal care products that contain at least 70 percent organic content by weight can be reviewed under NSF/ANSI Standard 305 and if compliant, are eligible to bear the mark shown here.
Products that have been certified by Quality Assurance International bear the certification mark shown to the right. QAI certifies that the product meets applicable organic standards in the country where the product is being sold.