Drinking water treatment unit standards
UL is accredited in the United States and Canada to certify drinking water treatment units to both aesthetic and health affects claims including:
- Chillers
- Coolers
- Cation exchange water softeners
- Distillation units
- Reverse osmosis systems
- Ultraviolet microbiological treatment systems
Depending on the type of product submitted and manufacturers claims, UL will certify the product to one or more of the following standards.
ANSI/NSF Standard 42: Drinking Water Treatment Units-Aesthetic Effects
The point-of-use and point-of-entry units covered by this Standard are designed to be used for reduction of specific contaminants that may be present in drinking water (public and private). Systems covered under this Standard are intended to reduce substances that affect the aesthetic quality of the water.
ANSI/NSF Standard 44: Cation Exchange Water Softeners
This Standard covers household and commercial cation exchange water softeners designed to be used for the removal of hardness and the reduction of specific contaminants from public or private drinking water supplies considered to be microbiologically safe.
ANSI/NSF Standard 53: Drinking Water Treatment Units-Health Effects
The point-of-use and point-of-entry systems addressed by this standard are designed to be used for the reduction of specific substances that may be present in drinking water (public or private) and are considered established or potential health hazards. These substances may be microbiological, chemical or particulate (including filterable cyst) in nature.
ANSI/NSF Standard 55: Ultraviolet Microbiological Water Treatment Systems
This Standard covers ultraviolet microbiological water treatment systems and components for point-of-use and point of entry applications.
ANSI/NSF Standard 58: Reverse Osmosis Drinking Water Systems
The point-of-use reverse osmosis drinking water treatment systems covered by this standard are those designed to be used for the reduction of specific contaminants from public or private drinking water supplies considered to be microbiologically safe and of known quality. Systems covered by this standard are intended for reduction of total dissolved solids (TDS) and other specific contaminants.
ANSI/NSF Standard 62: Drinking Water Distillation Systems
Distillation systems covered by this standard are systems designed to be used to reduce specific chemical and microbiological contaminants. Systems covered by this standard are not intended for the treatment of water that is visually contaminated (turbid) or has an obvious contamination source, such as raw sewage.
