Commercial & Industrial UV Regulations

Commercial / industrial applications can include a wide variety of markets and flow rates with varying requirements. Some of these markets are very different from the drinking water markets as they do not necessarily feed water to the public for consumption, however they are still mandated to comply with specific requirements depending on the application.

C/I can include drinking water applications such as hospitals, restaurants, hotels, resorts, campgrounds, offices or even daycare centers. For these applications the UV equipment installed must comply with the drinking water regulations for that particular area. The required compliance could be to one of the following UV validation protocols depending on the flow rate and particular application: NSF 55 Class A, WQA Gold Seal, DVGW or CSA B483.1.

Some non-drinking water applications that would fall under the C/I heading can include processing plants, bottled water plants, the beverage industry, irrigation applications, or recreational type applications like splash pads or pools. The regulations that could come into play here could be NSF 50, which is specifically for pools, or ETV validation.

NSF 55 Class A:

NSF logo


NSF 55 is a UV disinfection validation protocol that is used to prove the performance of the UV equipment under specific conditions. This protocol is defined as a residential protocol and only tests up to a maximum flow rate of 50 USGPM.

The NSF 55 protocol requires the UV system to deliver a dose of 40 mJ/cm² at the system's alarm set-point. The alarm set-point of a UV system is achieved during testing by lowering the UV transmittance (UVT) of the influent water to a minimum UVT level to a minimum of 70%. What NSF wants to ensure is that the dose being delivered by the system never falls below 40 mJ/cm². This protocol also includes detailed testing on the materials that make the equipment itself, ensuring that nothing is being leached into the water as well as pressure and hydraulic testing. This protocol is widely accepted across North America and some parts of Europe.

NSF 50:

The NSF 50 standard is specifically for pools, spas and recreational products. This standard uses a variety of existing standards (NSF, ASTM, ASME, UL, IAPMO) in the evaluation of recreational water products. The items addressed during testing are the materials, products and equipment used at recreational facilities. The NSF 50 standard incorporates minimum requirements for material health, corrosion resistance, product marking, product design, product performance, output, bacterial inactivation and product durability.


ETV logo


The ETV validation protocol is one that can be described as an independent validation of the claims made about the performance of the environmental benefits of an innovative technology. This program offers not a label of a specific validation by a statement of verification of the equipment for use in business-to-business relations. ETV can be used to prove compliance with any relevant legislation or it can be used to convince others of performance claims, like regulators or potential customers of a certain technology. How ETV works is a four step process:

  • STEP 1: Proposal phase - the technology is explained and any existing test data is examined at this time as well as the initial claims that have been made for this product
  • STEP 2: Specific protocol preparation phase - the protocol that the manufacturer wishes to follow is determined
  • STEP 3: Assessment and verification phase - the testing of the equipment and gathering of results is carried out
  • STEP 4: Publication phase - the data is published and signed off on by the third party expert

WQA Gold Seal:


The WQA Gold Seal program was developed by the WQA (Water Quality Association) for testing of all products that come into contact with drinking water. This program certification complies with all requirements of the standards used throughout the drinking water industry (WQA, NSF, APAMO, ASME and ASTM). The products that display the Gold Seal mark provide assurance to consumers and regulatory agencies that products have been tested and meet the requirements of the standards. This is an accredited program.



DVGW is a German standard for products that come into contact with drinking water. This standard is similar to the NSF 55 standard with some significant differences. Under the DVGW standard the equipment being tested must comply with the rigors of the protocol which include a specific dose delivery of 40 mJ/cm² as well as stringent design specifications of the system's UV sensor.

DVGW's web link is

CSA B483.1:


CSA B483.1 is a Canadian standard that was created by the Canadian Standards Association (CSA) in order to develop additional requirements, outside the existing NSF/ANSI standards, to meet plumbing, mechanical, and electrical requirements for drinking water treatment components and complete systems. Products under this scope include POU and POE plumbed systems and POU non-plumbed systems. The regulation went into Canadian National Plumbing Code in 2010 but provinces can adopt the standard at any time.