Residential applications include a wide range of flow rates and sizes. Certain regions require UV water treatment to be independently tested and certified to a particular standard. A few applicable standards are NSF/ANSI 55, WQA Gold Seal, and CSA B483.1.
Commercial / industrial UV treatment systems do not always fall under drinking water systems requirements, but they still must comply with specific testing standards. These markets can include campgrounds, hotels, restaurants, processing plants, and recreational facilities. Testing protocols include NSF/ANSI 55, ETV and DVGW.
Municipal applications will always fall under the drinking water regulations as they feed water to the public that can be consumed. These applications can include private community water treatment facilities as well as municipal treatment systems with a wide range of flow rates. When UV water treatment systems are installed, it must comply with the applicable drinking water regulations. Testing protocols include USEPA UVDGM (UV Disinfection Guidance Manual) 2006, DVGW, ÖNorm and NSF/ANSI 55.
Example of a UV Water Treatment Standard
NSF/ANSI 55 – Ultraviolet Microbiological Water Treatment Systems
NSF/ANSI 55 is a UV water treatment standard that is used to prove the performance of UV water treatment equipment under specific conditions. It also specifies other requirements for UV water treatment systems such as material composition and dimensioning. There are two different classes under this standard, Class A and Class B.
NSF/ANSI 55 Class A establishes the minimum requirements for UV water treatment systems intended for non-potable water. They are required to include a UV sensor to indicate if the UV intensity is dropping below an acceptable level. Class A systems must deliver a UV dose of at least 40 mJ/cm2 at the alarm set point.
NSF/ANSI 55 Class B establishes the minimum requirements for UV water treatment systems intended for potable water. Class B systems must deliver a UV dose of at least 16 mJ/cm2 at 70% of normal output.