Drinking Water Contact Certification

Why this matters

Plumbers tend to know that the parts they put on a water line need a drinking-water certification. The trades that touch the same water a few times a year often do not. An appliance tech connecting an ice maker, an HVAC tech tapping a supply for a humidifier, a water-treatment installer cutting in a softener bypass, a handyman swapping a faucet: each of them puts a tube, a fitting, a sealant or a lubricant into contact with water somebody will drink. When the part came from a bulk bin or an online listing with no certification, nobody can say what it leaches into that water.

The certification that answers that question is NSF/ANSI/CAN 61. This card covers what it tests, how it reaches you through the code, and which everyday parts outside plumbing need it. Lead content specifically has its own standard and its own federal law, covered in Lead-Free Plumbing Products and the Marking; this card does not repeat it.

What NSF/ANSI/CAN 61 actually tests

NSF/ANSI/CAN 61, Drinking Water System Components - Health Effects, is a consensus standard. It asks one question about a product: what does it put into the water? A sample is exposed to test water under conditions set for its use (temperature, contact time, the ratio of surface area to water volume), and the water is analyzed for what leached out of the product: metals, organic chemicals from plastics and elastomers, residues from solvents, plasticizers, residual monomers and anything else the product's formulation suggests. The results are compared against health-based limits, with the criteria for those limits now published in a companion standard, NSF/ANSI/CAN 600.

Three consequences of that design are easy to miss:

• It is about the material in its finished, installed form, not about the raw ingredient. A plastic resin certified as a material is not the same as a finished tube made from it by someone else.
• It is conditional. A certification states the use conditions it covers, for example cold water only, or up to a stated temperature, or a minimum pipe size. A component certified for cold water has not been tested for a water heater outlet.
• It is not a performance standard. NSF 61 says nothing about whether a connector holds pressure or a filter removes anything. Those are other standards. A part can be strong and leach, or certified and weak.

The end-of-line devices people drink from directly, such as kitchen and lavatory faucets and drinking fountains, are evaluated under a section of the standard written for them (commonly called Section 9), because the exposure there is short and immediate rather than a long run of pipe.

How it reaches you: codes and water systems

NSF 61 is not law on its own. It binds through adoption:

• Plumbing codes. The International Plumbing Code requires water service and water distribution materials, and the fittings, valves and fixture fittings on them, to conform to NSF 61, principally in Chapter 6 (Section 605 for the materials), as adopted by your jurisdiction. The UPC carries a parallel requirement. That makes NSF 61 an inspectable item on any permitted work on the supply side, and the normal expectation on unpermitted work too.
• State drinking-water programs. Most states require NSF 61 for components used by public water systems. That reaches utilities and their contractors, not the inside of a house, but it is why the certification is common on products sold into both markets.
• Your own purchasing rule. For the trades whose work is not permitted as plumbing (an ice maker hookup, a refrigerator water line, a coffee machine tap), there may be no inspector at all. The only thing that makes the certification apply is the shop deciding that it does.

The practical result: if a part sits between the water meter (or the well pressure tank) and a point where someone drinks, treat NSF 61 as the requirement whether or not anyone will inspect it.

The parts other trades install that touch drinking water

Treatment equipment carries a second family of standards, for performance rather than leaching: NSF/ANSI 42 (aesthetic effects such as chlorine taste), 53 (health effects, such as specific contaminant reduction), 44 (softeners) and 58 (reverse osmosis). A filter certified to one of those has been tested for what it claims to remove, and the material requirements for those units are built into those standards. A filter cartridge that claims to "reduce lead" with no certification to the standard covering lead reduction has made a claim nobody tested.

The lubricant and sealant trap

This one catches careful people. An O-ring lubricant or a thread sealant marked "food grade," or registered as suitable for incidental food contact (an H1 registration, used for machinery lubricants in food plants), is not the same thing as NSF 61. Incidental contact means a small amount might reach food on a processing line. NSF 61 means the product was tested in continuous contact with drinking water. The two are different evaluations for different exposures, and a can that carries one does not carry the other unless it says so.

When a cartridge, valve stem or filter housing needs lubricating, use the lubricant the component manufacturer specifies, or one that carries NSF 61 explicitly. The same goes for sealant tape and pipe dope on the supply side.

A worked case: the ice maker line from the drawer

An appliance tech is installing a new refrigerator with an ice maker and water dispenser. The customer's old setup has a self-piercing saddle valve on a copper line in the basement and about 20 feet of plastic tubing running up to the kitchen.

The existing parts. The saddle valve is a type some plumbing codes and many manufacturers no longer accept for this use (check what yours says before reusing one), and the tubing is old, unmarked and yellowed. Neither carries a certification the tech can read.

What was on the truck. In the parts drawer: a roll of unmarked plastic tubing left over from a bulk buy, a handful of loose brass compression fittings, and a packaged braided supply line with a certifier's mark and "NSF 61" on the tag.

The call. The tech uses the packaged, certified braided line and the certified compression adapter that came in its package. The loose fittings and the unmarked tubing stay on the truck: there is no way to tie either to a certification, and once they are installed in the customer's wall the question cannot be answered later. Replacing the saddle valve is plumbing work in many jurisdictions; the tech flags it on the ticket and offers the customer a plumber's visit rather than cutting into the copper line, since a licensed plumber is the right person for a new tee and shutoff on the supply.

The recommission. Before the water is turned on, every connection is checked hand-tight plus the turn the fitting maker specifies, and the tech has a towel and a pan under the basement connection. Water on: the tech watches each fitting for drips for several minutes with the line under pressure, with the refrigerator unplugged or its electrical connection clear of any drip path, since water and the appliance's power cord share the same space behind the unit. Once dry, the refrigerator is plugged in and the first batch of ice and the first few liters from the dispenser are discarded, following the refrigerator manufacturer's instructions, to flush the new line and filter.

What changes the answer. If the job were a commercial ice machine feeding a restaurant, the supply connection is plumbing in almost every jurisdiction, it sits behind a backflow device the plumbing code specifies, and the machine itself is evaluated under its own food-equipment standard. The appliance tech's part of that job may stop at the machine's inlet.

What gets recorded. The line, its certification, and the flagged saddle valve, on the ticket. If a customer later asks what went into the wall, the record answers.

How to tell a real certification from a claim

Read what is printed on the part or its packaging and look for three things together: a certifier's mark, the standard designation (NSF/ANSI/CAN 61, or "NSF-61" beside the mark), and on pipe and tubing, often a potable-water mark such as "NSF-pw." Then confirm an unfamiliar product in the certifier's online listings, by manufacturer and model; the method is in How to Check a Listing Before You Buy an Unfamiliar Product. A seller's product description saying "BPA free," "food safe" or "drinking water safe" is a description, not a certification.

References

• NSF/ANSI/CAN 61, Drinking Water System Components - Health Effects, and NSF/ANSI/CAN 600, Health Effects Evaluation and Criteria, binding through the plumbing code your jurisdiction adopts and through state drinking-water programs for public water systems
• International Plumbing Code Chapter 6 (Section 605), as adopted by your jurisdiction
• NSF/ANSI 42, 44, 53 and 58 for drinking-water treatment units
• See related: Lead-Free Plumbing Products and the Marking; Backflow Prevention Reference; How to Check a Listing Before You Buy an Unfamiliar Product