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Confused about NSF/ASNI 61 for Chemical Storage? You're Not Alone

If you manufacture, sell or distribute water treatment or distribution products in North America, your products typically must comply with NSF/ANSI Standard 61. NSF/ANSI 61 sets the criteria for water system components to protect health standards. It’s important that all components in water treatment meet the correct standards to ensure dangerous toxins aren’t leached.

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However, there is confusion about NSF-61 certifications, and that confusion could lead to purchasing the wrong product for your application. Let’s explore NSF/ANSI 61 and how to make sure your chemical storage tank system meets the necessary requirements.

What Is NSF/ANSI 61 Certification?NSF_ANSI_Standard_61

NSF/ANSI Standard 61 (NSF 61) is a set of national standards that relate to water treatment. It establishes stringent requirements for the control of equipment that comes into contact with either potable water or products that support the production of potable water. The tests vary from a basic cold water test at different pH levels to the more challenging chemical certification.

How Does NSF Test Tanks and Accessories?

A liquid is tested before and after exposure to a given piece of equipment to determine whether anything has been leached out or extracted from the equipment

There are various levels of certification that a chemical storage system can achieve. This variance can make certification confusing, and some manufacturers incorrectly explain the certification levels of their products. In fact, some products listed as NSF-61 certified may only apply to potable water and not to chemical storage or vice versa. As a result, you could end up buying the wrong product for your application.

Many manufacturers test pH 5, pH 8 and pH 10 exposure water at ambient temperature. That is sufficient for potable water storage, but those tests can’t account for potential leaching in chemical storage tanks. Chemical storage systems require more stringent testing. 


For chemical tests, NSF exposes the tanks to chemicals certified to NSF/ANSI 60. The tanks undergo an exposure period dictated by the NSF/ANSI 61. Once the exposure time is completed, the chemical that was exposed to the tank material is analyzed for the presence of chemical compounds that may have leached from the tank itself. If there are no detectable leachants or the leachants are below the pass/fail criteria, then the tank passes the test. This testing is performed on the most aggressive chemicals that may be stored in the tank.

A full system certification includes even small parts. Smaller parts like gaskets and fittings must also pass certification to consider the full system certified. It’s important that all materials meet this standard for potable water and chemical storage.


PPC Can Supply an Entire Tank System That is NSF/ANSI 61 Certified

Manufacturers may have certified tanks, but their fittings and gaskets may not be NSF/ANSI certified. Poly Processing is the only chemical storage tank manufacturer to take a full system approach to NSF approval. We supply an entire tank system, including fittings, gaskets and specific tank colors that are certified for NSF/ANSI 61.

Currently, we have NSF-61 Certification for 35 of the most popular water treatment chemicals on our XLPE tank systems. Additionally, our certifications cover XLPE tanks with OR-1000 (our engineered antioxidant barrier). Poly tanks are certified for both potable water and chemical storage.


Get the Facts About NSF Certification

NSF/ANSI 61 certification can be confusing. Make sure you have all the facts you need before purchasing your chemical storage system. Download our NSF/ANSI 61 Certification ebook to learn more about NSF certification for potable water storage vs. chemical storage.

Download the NSF/ANSI 61 Certification eBook

Topics: Certifications and Standards, Value Added