UV Technology for Municipal Drinking Water

Protecting Public Health

If untreated and ingested, drinking water containing harmful bacteria, viruses and protozoa can cause severe, even fatal, health conditions.

UV technology helps to provide water confidence to the full range of public water systems, from large municipalities to very small drinking water systems around the world. UV technology is often paired with chlorine in drinking water applications, enabling robust, multi-barrier protection.

UV Applications for Municipal Drinking Water

TrojanUVSwift Installation

How UV Light Disinfects Drinking Water

UV light provides rapid, effective inactivation of microorganisms through a physical process. When bacteria, viruses and protozoa are exposed to the germicidal wavelengths of UV light, they are rendered incapable of reproducing and infecting.

UV Systems for Public Drinking Water

TrojanUV and VIQUA systems are installed and trusted in public water systems around the world, including:

  • Any size community water system, including major municipalities like New York City
  • Non-community water systems (with their own water supply) such as:
    • Offices, schools, hospitals, churches, campgrounds, B&Bs, golf courses, gas stations

Find out how our expertise can help your drinking water meet evolving regulations with product validations such as DVGW, USEPA and NSF 55 Class A.

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Series of VIQUA Pro UV units certified to NSF 55 Class A used in small drinking water system.

A photo of a TrojanUVFlex 100 Series chamber


The TrojanUVFlex® is designed with features to make installation and operation simpler, faster and more cost-effective than ever before. Built on the proven TrojanUV Solo Lamp® Technology platform, TrojanUVFlex allows for energy-efficient high-intensity delivery of UV light in an extremely compact footprint.

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A photo of a TrojanUVSwift chamber


The TrojanUVSwift® is a testament to our commitment to providing water confidence. It boasts comprehensive validation at a wide range of flow rates and UV transmittance levels in full compliance with the protocols of the United States Environmental Protection Agency UV Disinfection Guidance Manual.

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A photo of a TrojanUVSwiftSC chamber


The TrojanUVSwift®SC is designed to treat flow rates of 20 gallons per minute (GPM) to 16 million gallons per day (MGD) or 4.5 to 2,525 m3/hr. These compact UV systems offer small communities an economical solution for drinking water disinfection.

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VIQUA PRO10 UV disinfection system


The VIQUA PRO Series is suited to regulated environments, like very small community drinking water systems, transient and non-transient community drinking water systems that demand certified disinfection systems. There are options that are NSF 55 Class A and USEPA certified.

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Multi-barrier Strategy Using UV Technology

Government legislation continues to change the way drinking water system operators look at preserving public health. Stringent regulations, such as the USEPA Long Term 2 Enhanced Surface Water Treatment Rule (requiring the treatment of Cryptosporidium) and the Ground Water Rule (requiring 4-log reduction virus treatment) in the U.S., often necessitate the use of UV to supplement existing systems. This strategy is known as multi-barrier protection.

A UV system is an ideal addition to a drinking water treatment plant’s multi-barrier strategy. UV technology is easily integrated into existing processes because it does not alter nor is it affected by water chemistry (e.g., pH).

The combined range of effectiveness when UV and chlorine are used together to disinfect drinking water

In a multi-barrier strategy, UV is most often paired with a chlorine-based system. UV and chlorine naturally complement each other, as UV is highly effective against chlorine-resistant microorganisms such as Cryptosporidium.

UV is a simple and cost-effective solution that can be easily retrofitted into existing systems. The contact time required for the UV process is mere seconds, so the footprint required is relatively small, reducing the need for large contact tanks and lowering construction costs.

The World’s Largest UV Drinking Water Facility

Public water systems around the world – from rural wells to municipalities serving millions of people – have installed UV systems to help safeguard their water.

New York City is home to the world’s largest UV drinking water facility. There are 56 custom-designed TrojanUV systems installed there and each of them is capable of delivering a 40 mJ/cm2 dose to 40 million gallons of water per day.

A aerial photo of New York City skyline and port

The disinfection requirement, set by the NYC Department of Environmental Protection, allows for the delivery of greater than 3-log reduction of Cryptosporidium and Giardia. All told, the facility has the capacity to treat 2.02 billion gallons of water per day.

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Treating Environmental Contaminants in Drinking Water

Increasingly, drinking water supplies are being impacted by the presence of chemical contaminants. Pesticides, nitrosamines such as N-nitrosodimethylamine (NDMA), and other micropollutants have all been found in both groundwater and surface waters that act as drinking water supplies.

Fortunately, the UV advanced oxidation process (also known as UV AOP) destroys chemical contaminants in water. TrojanUV advanced oxidation systems have been installed around the world to address a variety of environmental contaminants.

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