"NSF International, formally knows as The National Sanitation Foundation, is an independent, not-for-profit, neutral agency, serving government, industry, and consumers in achieving solutions to problems relating to public health and the environment. NSF Standards for equipment, products and services are developed with the active participation of public health and other regulatory officials, users and industry. NSF publishes Listing Books which identify equipment, products, components, materials, ingredients or services that have demonstrated conformance with NSF requirements and are authorized for Certification. Materials used for NSF approved devices must often comply with NSF material standards. Three commonly referenced NSF Standards for plastics materials are 14, 61, and 51. NSF Standard 14: Plastics Piping Components and Related Materials applies to thermoplastic and thermoset plastics piping system components in contact with potable water and primarily addresses physical properties of plastic components in piping and plumbing systems. ANSI/NSF Standard 61: Drinking Water System Components – Health Effects covers indirect drinking water additives. This standard addresses health and toxicity effects of plastic resins. NSF Standard 51: Plastic Materials and Components Used in Food Equipment defines the material requirements for foot protection, considering extractables using FDA guidelines. For further information on NSF Standards, contact NSF International, 3475 Plymouth Road, P.O. Box 1301140, Ann Arbor, MI 48113-00140. By phone; (313)769-8010."
http://www.plasticsintl.com/food_compliant_materials.html
potable water is regulated yes, ground water by the EPA, but where do you find the FDA regulating greenhouse use of materials?
the NSF is not the fda fwiw.