The NSF inspector collects samples for submission to the NSF laboratory in Ann Arbor, Michigan. NSF staff tests Certified products regularly for performance and health effects specified by the applicable ASTM, AWWA, CSA or other performance standards. For products used in potable water systems, health-effects testing is conducted to NSF Standard 61. NSF must assure that the amount in the product is below established maximum allowable levels. NSF auditors have the contract authority, when noncompliant product is discovered during an inspection or testing, to place that product on hold until corrective action is taken.
Corrective action can include destruction of the errant product.
When it is required, product destruction must be performed under the direct supervision of an NSF Representative.