Understanding NSF/ANSI 61: What Potable Water Applicators Need to Know in 2026
If you’ve been getting more inquiries about potable water tank lining and cistern work, you’ve probably encountered a question that can derail a bid or a project: “Is your coating NSF 61 certified?”
It’s an important question, and the answer requires some nuance. Here’s everything applicators need to know about NSF/ANSI 61 in the context of polyurea coatings work.
What NSF/ANSI 61 Actually Certifies
NSF/ANSI 61 is a product-level standard, not an installer credential. It certifies that a specific coating formulation, when applied and cured according to the manufacturer’s protocol, does not leach harmful levels of contaminants into drinking water. The certification is held by the coating manufacturer — not by you as an applicator.
What this means practically: your job is to use an NSF 61-listed product and follow the application protocol exactly. Deviations from the manufacturer’s specified application method — including film thickness, temperature at application, surface preparation, cure time before return-to-service — can void the listing certification’s validity for that application.
How to Verify a Product’s NSF 61 Status
NSF maintains a publicly searchable database of certified products at nsf.org. Before accepting a potable water project, verify that:
- The specific product (not just the brand or product line) appears in the NSF database
- The listing is current (certifications expire and must be renewed)
- The product is listed for the correct contact type (drinking water for human consumption, not just process water)
- The listed application conditions match your project conditions
Documentation for Municipal Clients
Municipal water authorities and engineering firms will often request a certification package. As the applicator, your documentation should include:
- Manufacturer’s NSF 61 certificate for the specific product used (request this from your supplier)
- Application records showing compliance with specified conditions (ambient temp, substrate temp, DFT measurements)
- Holiday test results (100% of surface area)
- Adhesion pull-off test documentation
- Material batch/lot numbers used
Building this documentation package proactively — not in response to a client request after the fact — marks you as a professional and often leads to repeat business and referrals within the municipal network.
The PolyOrgs Potable Water Endorsement
The Potable Water Specialty Endorsement (PW) covers all of the above in depth, plus additional content on cistern and tank geometry, application sequencing for complex structures, and how to communicate technical compliance to non-technical municipal clients. If you’re doing any potable water work or want to target this growing segment, the PW endorsement is worth pursuing.
Questions? Contact us or bring them to the next chapter meeting in your region — see the meetings calendar here.