The National Science Foundation (NSF) is an independent federal agency that provides certification for the food, water, and consumer products after testing them against some criteria. These certifications ensure that the product you are using is adhering to the strict standards set for public health safety. Several consumer products that are used daily have NSF certifications. NSF has formulated certifications for water filters through exhaustive review and comprehensive research conducted by researchers across production, various industries, academic researchers, and consumer industries. This article discusses different NSF certifications, testing, and certification processes.