What Is the Difference Between FDA and NSF Certification
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What Is the Difference Between FDA and NSF Certification?
Buyers use FDA and NSF interchangeably, and the confusion is understandable because both appear on the same datasheet and both concern safety. But one is a government regulator that writes rules and does not certify products, and the other is an independent organisation that tests products and inspects factories. Knowing which is which determines what evidence you can actually demand.
For storage tanks the practical answer is usually both: the coating must comply with the FDA regulations that legally govern food contact, and an NSF certification is the most credible way to prove it. For drinking water, NSF/ANSI 61 is the certification that matters most, and it is the one most often referenced in tenders.
1. What Is FDA?
A federal regulatory agency. It sets legally binding requirements for food-contact substances and enforces them, but it does not certify, approve or list individual products such as storage tanks.
· Regulator, Not Certifier: FDA publishes regulations - for example 21 CFR 175.300 for resinous and polymeric coatings - and expects manufacturers to comply.
· Self-Declared Compliance: Compliance with FDA regulations is declared by the manufacturer and supported by test data; there is no FDA product certificate to download.
· Legal Authority: FDA requirements have the force of law in the United States and apply to the substance, not to the finished vessel.
· What to Ask For: A written compliance statement naming the regulation, plus extraction or migration test results from a competent laboratory.
2. What Is NSF?
An independent standards organisation that develops consensus standards, tests products against them, audits manufacturing facilities and issues certifications that are maintained through ongoing surveillance.
· Third-Party Certification: NSF tests the actual product and issues a listing that buyers can verify in a public directory.
· Facility Audit: Certification includes inspection of the manufacturing facility and periodic unannounced audits, which is why it carries more weight than a self-declaration.
· NSF/ANSI 61: The drinking water standard, assessing what contaminants may leach from a product into potable water and setting health-effect based limits.
· NSF/ANSI 51: The food equipment materials standard, covering materials used in food processing equipment rather than in drinking water systems.
3. Which Do You Need?
It depends on what the tank holds and where it is. Three scenarios cover most projects.
· Drinking Water: NSF/ANSI 61 is the priority certification, supported by FDA or local regulatory compliance for the coating material.
· Food and Beverage Processing: FDA regulation 21 CFR 175.300 compliance for the coating, plus NSF/ANSI 51 where the buyer or the customer's audit regime requires third-party certification.
· European Projects: EU 1935/2004 is the framework, with national schemes such as the German LFGB supplying the test regime most European buyers request.
· Best Practice: Request both: a regulation-referenced compliance statement, and the NSF listing number where a certification exists for the product.
Aspect | FDA | NSF |
Nature | Federal regulatory agency | Independent standards and certification body |
Output | Regulations under the Code of Federal Regulations | Consensus standards and product certifications |
Product approval | Does not approve or certify tanks | Tests products and issues listings |
Evidence available | Manufacturer's compliance statement plus test data | Publicly verifiable certification with facility audit |
Key references | 21 CFR 175.300 for coatings | NSF/ANSI 61 water, NSF/ANSI 51 food equipment |
Ongoing oversight | Market surveillance and enforcement | Periodic unannounced audits and retesting |
Engineering Assurance and Project Support
Every tank delivered by Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel) is engineered against AWWA D103-09 and EN 1090 with finite element verification of shell, roof and nozzle loads, fused at 820-930°C under ISO 9001 and ISO 45001 control, holiday tested at 1500 V across one hundred percent of the surface, and assembled with Grade 8.8 bolts and manufacturer-certified sealant. Center Enamel supplies NSF/ANSI 61 certified glass-fused-to-steel for potable service and food contact compliance documentation against 21 CFR 175.300, with LFGB documentation available for European projects.
Frequently Asked Questions (FAQ)
Is NSF certification legally required?
Not by federal law, but it is required by most US state and local plumbing and health codes, and it is written into the great majority of drinking water specifications. In practice, a tank without NSF/ANSI 61 will not be accepted for potable service in most US jurisdictions.
Does FDA issue certificates for tanks?
No. FDA does not approve or certify finished products such as storage tanks. Manufacturers declare compliance with the applicable regulations and support it with testing; third-party bodies such as NSF provide the certification.
What is NSF/ANSI 61?
It is the American standard for drinking water system components. It evaluates what contaminants may leach from a product into drinking water and sets health-based limits, through product testing plus facility audit and ongoing surveillance.
What is NSF/ANSI 51?
It is the standard for materials used in food equipment - the food processing counterpart to NSF/ANSI 61. It is the certification food processors commonly require of equipment and contact surfaces.
Key Takeaways
· FDA is a regulator that writes rules; NSF is a certifier that tests products and audits factories.
· FDA does not certify tanks - expect a compliance statement to a named regulation plus test data.
· NSF/ANSI 61 governs drinking water components; NSF/ANSI 51 governs food equipment materials.
· Potable projects need NSF/ANSI 61; food processing needs 21 CFR 175.300 compliance plus NSF/ANSI 51.
· European projects work under EU 1935/2004 with LFGB as the commonly requested test regime.
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