NSF/ANSI 62: Water distillers
Reverse osmosis and distillation · Official title: Drinking Water Distillation Systems
Covers distillers, which boil water and collect the steam as it condenses. NSF notes that heavy metals stay behind, but some chemicals that turn to gas easily can carry over.
What it can cover
- Heavy metals, which NSF says are left behind when the water boils
- Other reduction claims as shown on each product listing
What it does not
- Volatile organic chemicals (VOCs) in general. NSF notes some can carry over with the water vapor.
The usual mistake
Assuming distilled water is free of everything. NSF notes that chemicals that turn to gas easily, such as some VOCs, can carry over.
The fine print
- NSF's listing search showed no distillers certified by NSF on Oct. 4, 2026.
- NSF posted a 2026 edition of this standard.
Sources
- NSF Standards for Water Treatment Systems, NSF. Checked Oct. 4, 2026.
- Search for NSF Certified Drinking Water Treatment Units (standards and reduction claims lists), NSF. Checked Oct. 4, 2026.
- Joint Committee on Drinking Water Treatment Units: recent documents (2026 editions of 44, 55, 62, 244, 401), NSF. Checked Oct. 4, 2026.